digital clock distributor 523 description and specifications

digital clock distributor 523 description and specifications
TMSL 097-45230-01
Issue 13: Mar 00
DIGITAL CLOCK DISTRIBUTOR
523
DESCRIPTION AND SPECIFICATIONS
CONTENTS
PAGE
1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . .
2
2. INTRODUCTION . . . . . . . . . . . . . . . . . . . .
3
3. DESCRIPTION . . . . . . . . . . . . . . . . . . . . . .
A. Master Shelf . . . . . . . . . . . . . . . . . . . .
B. Expansion Shelf . . . . . . . . . . . . . . . . .
C. Remote Wire-wrap Panel . . . . . . . . .
D. Remote System . . . . . . . . . . . . . . . . .
E. DCD-LPR . . . . . . . . . . . . . . . . . . . . . . .
F. Cards . . . . . . . . . . . . . . . . . . . . . . . . .
G. Interface Panels and Interface
Modules . . . . . . . . . . . . . . . . . . . . . . .
H. Bridging Isolator Module. . . . . . . . . .
I. Card Quantities . . . . . . . . . . . . . . . . .
4
6
8
9
10
10
11
17
19
19
4. SYSTEM DESCRIPTION . . . . . . . . . . . . . . .
A. System Architecture . . . . . . . . . . . . .
B. System Power . . . . . . . . . . . . . . . . . .
C. Input Signals . . . . . . . . . . . . . . . . . . .
D. Clocks . . . . . . . . . . . . . . . . . . . . . . . .
E. Reference Monitoring . . . . . . . . . . .
F. Timing Output . . . . . . . . . . . . . . . . . .
G. Output Protection . . . . . . . . . . . . . . .
H. Synchronous Clock Insertion . . . . . .
I. SSM . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
21
21
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23
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24
25
5. ALARM AND MAINTENANCE CARD
DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . .
A. SAI Card . . . . . . . . . . . . . . . . . . . . . .
B. MIS Card . . . . . . . . . . . . . . . . . . . . . .
25
25
26
6. CLOCK INPUT CARD DESCRIPTIONS . . . .
A. CI-EA Card . . . . . . . . . . . . . . . . . . . . .
B. CI Card . . . . . . . . . . . . . . . . . . . . . . .
C. ACI Card . . . . . . . . . . . . . . . . . . . . . .
D. DCIM Cards . . . . . . . . . . . . . . . . . . . .
E. MRC Card . . . . . . . . . . . . . . . . . . . . .
28
28
29
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30
31
7. CLOCK CARD DESCRIPTIONS . . . . . . . . .
A. ST2E Card . . . . . . . . . . . . . . . . . . . . . .
B. ST2 Card . . . . . . . . . . . . . . . . . . . . . . .
C. ST3E Card . . . . . . . . . . . . . . . . . . . . . .
34
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35
36
CONTENTS (Contd)
D.
E.
F.
G.
PAGE
ST3 Card . . . . . . . . . . . . . . . . . . . . . . .
TNC-E Card . . . . . . . . . . . . . . . . . . . . .
TNC Card . . . . . . . . . . . . . . . . . . . . . . .
LNC Card . . . . . . . . . . . . . . . . . . . . . . .
37
37
38
39
8. TIMING OUTPUT CARD DECRIPTIONS. . . . .
A. EA10 Card . . . . . . . . . . . . . . . . . . . . . .
B. EA10M Card . . . . . . . . . . . . . . . . . . . . .
C. TOAA Card . . . . . . . . . . . . . . . . . . . . .
D. TOCA Card . . . . . . . . . . . . . . . . . . . . .
E. TOGA Card . . . . . . . . . . . . . . . . . . . . .
F. TO-EA5 Card . . . . . . . . . . . . . . . . . . . .
G. TO-EA Card . . . . . . . . . . . . . . . . . . . . .
H. TO-EAN Card . . . . . . . . . . . . . . . . . . . .
I. TOEA Card . . . . . . . . . . . . . . . . . . . . . .
J. TOLA Card . . . . . . . . . . . . . . . . . . . . . .
K. TOTL Card . . . . . . . . . . . . . . . . . . . . . .
L. TOTA and TOTA-5 Cards . . . . . . . . . . .
M. TOTA-M Card . . . . . . . . . . . . . . . . . . . .
39
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41
41
41
41
41
43
43
44
44
44
45
46
9. MCA-5M CARD AND OUTPUT
PROTECTION MATRIX . . . . . . . . . . . . . . . . .
46
10. MCA-5 CARD AND OUTPUT
PROTECTION MATRIX . . . . . . . . . . . . . . . . .
47
11. INSERTION CARD DESCRIPTIONS . . . . . . . .
A. SCIU Card . . . . . . . . . . . . . . . . . . . . . .
B. ESCIU Card . . . . . . . . . . . . . . . . . . . . .
48
48
50
12. PSM CARD DESCRIPTION . . . . . . . . . . . . . .
51
13. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . .
52
Figures
1. DCD-523 Rack Layout . . . . . . . . . . . . . . .
2. Master Shelf Equipped with Rubidium
Clock Cards . . . . . . . . . . . . . . . . . . . . . . .
3. Master Shelf Equipped with Quartz
Clock Cards . . . . . . . . . . . . . . . . . . . . . . .
4. Expansion Shelf . . . . . . . . . . . . . . . . . . . . .
Copyright © 1993–2000 Symmetricom, Inc. All rights reserved. Printed in U.S.A.
5
6
7
8
TMSL 097-45230-01
Figures (Contd)
5. DCD Shelf Wire-wrap Panel to Remote
Wire-wrap Panel Connection . . . . . . . . .
6. Master to Remote System Connection .
7. DCD-523 to DCD-LPR Connection . . . . .
8. ANSI-Class MMP . . . . . . . . . . . . . . . . . . . .
9. Wire-wrap Panel . . . . . . . . . . . . . . . . . . . .
10. ITU-Class MMP . . . . . . . . . . . . . . . . . . . . . .
11. ITU-Class Output MMP . . . . . . . . . . . . . . .
12. Remote Wire-wrap Panel . . . . . . . . . . . .
13. E1 Bridging Isolator Module . . . . . . . . . . .
14. Wire-wrap Bridging Isolator Module . . . .
15. DCD-523 System . . . . . . . . . . . . . . . . . . .
Issue 13: Mar 00
Page
• Changed Table A to show the correct part number of the TO-EA5V5 card.
9
10
10
17
17
18
18
18
19
19
22
• Changed Table O to correct information for the
TOAA card.
1.03 Symmetricom is a registered trademark of
Symmetricom, Inc. DCD and Version 5 are trademarks of Symmetricom, Inc. All other product
names, service marks, trademarks, and registered
trademarks used in this document are the property
of their respective owners.
1.04 The following abbreviations are used in this
document:
Tables
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
M.
N.
O.
P.
DCD-523 System Cards . . . . . . . . . . . . . .
Protection Modes for Output Cards . . . .
Slot Covers. . . . . . . . . . . . . . . . . . . . . . . . .
1:N TO Card Incompatibility . . . . . . . . . .
1:N TOTA Card Compatibility with
MCA-5M Card . . . . . . . . . . . . . . . . . . . . . .
Card Quantities (Max Number per Shelf)
Priority of Internal Timing Signals . . . . . .
Valid SSM Clock Input Card
Combinations . . . . . . . . . . . . . . . . . . . . . .
Invalid SSM Clock Input Card
Combinations . . . . . . . . . . . . . . . . . . . . . .
Cards Incompatible with MISV5 . . . . . . . .
Cards Incompatible with Non-Version 5
MIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PSM Card Factory Threshold Settings
for MTIE and TDEV . . . . . . . . . . . . . . . . . . .
System Specifications . . . . . . . . . . . . . . .
Bridging Isolator Specifications . . . . . . . .
Card Specifications . . . . . . . . . . . . . . . . .
Specification Terms . . . . . . . . . . . . . . . . .
12
15
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16
20
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25
25
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27
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53
55
56
80
1. GENERAL
1.01 This section provides descriptions and specifications for the Digital Clock Distributor 523
(DCD-523) System.
1.02 This section was reissued for the reasons listed
below. Changes and additions are marked by change
bars.
Page 2
AIS
AMI
B8ZS
BITS
BPV
CAS
CCS
CRC-4
D4
DCD
DCE
DS1
DSX-1
E1
ESF
GPS
HDB3
HS
ITU
LNC
LOS
LPR
MMP
MTIE
OCXO
OOF
PRC
SASE
SDH
SSM
SSU
T1
alarm indication signal
alternate mark inversion signal
bipolar 8-zero substitution
Building Integrated Timing Supply
bipolar violation
channel associated signaling
common channel signaling
cyclic redundancy check
D4 framing format
Digital Clock Distributor
Data Communications Equipment
digital signal, level 1 (1.544 Mb/s)
digital cross-connect, level 1
European Signal, level 1 (2.048 Mb/s)
extended superframe
global positioning system
high density binary 3
hot spare (card or slot)
International Telecommunication Union
Local Node Clock
loss of signal
Local Primary Reference
modular mounting panel
Maximum Time Interval Error
oven-controlled crystal oscillator
out-of-frame
primary reference clock
Stand-alone Synchronization Equipment
Synchronous Digital Hierarchy
Synchronization Status Message
Synchronization Supply Utility
digital transmission link (1.544 Mb/s)
Issue 13: Mar 00
TDEV
TL1
TNC
TO
VCXO
Time Deviation
Transaction Language 1
Transit Node Clock
Timing output (card or slot)
voltage-controlled crystal oscillator
TMSL 097-45230-01
090-45018-14) cards, these cards are collectively
referred to as MIS cards.
9. Where information is common to the MCA-5 and
MCA-5M cards, these cards are collectively referred to as MCA cards.
Notes:
1. Where information is common to the MRC-EAV5
(p/n 090-45010-56, -57), MRC-TV5 (p/n 09045010-53, -54, -58), MRC-EA (p/n 090-45010-06,
-09), MRC-T (p/n 090-45010-03, -08), ACI,
CI-EA, CI, DCIM-T, and DCIM-EA cards, these
cards are collectively referred to as clock input
cards.
2. Where information is common to the DCIM-T
and DCIM-EA cards, these cards are collectively
referred to as DCIM cards.
3. Where information is common to the MRC-EAV5,
MRC-TV5, MRC-EA, and MRC-T cards, these
cards are collectively referred to as MRC cards.
4. Where information is common to the PSM-EV5
(p/n 090-45025-52), PSM-EAV5 (p/n 090-4502554), PSM-TV5 (p/n 090-45025-51), PSM-E (p/n
090-45025-02), and PSM-T (p/n 090-45025-01
and 090-45025-53) cards, these cards are collectively referred to as PSM cards.
5. Where information is common to the TNC-E,
TNC, LNC, ST2, ST2E, ST3E, and ST3 cards,
these cards are collectively referred to as clock
cards.
6. Where information is common to the TNC-E,
ST2, and ST2E cards, these cards are collectively
referred to as rubidium clock cards.
7. Where information is common to the TNC, LNC,
and ST3E cards, these cards are collectively referred to as quartz clock cards.
8. Where information is common to the MISV5 (p/n
090-45018-05) and MIS (p/n 090-45018-04 and
10. Where information is common to any modular
mounting panel and the wire-wrap panel, these
panels are collectively referred to as interface
panels.
11. The Enhanced Transit Node Clock (TNC-E) card
and the Enhanced Stratum-2 (ST2E) clock card
are identical in specifications, functions, controls
and indicators, and acceptance test procedures.
The TNC-E name uses ITU standard terminology; the ST2E name uses ANSI standard terminology.
The
TNC-E
and
ST2E
are
interchangeable.
2. INTRODUCTION
2.01 The DCD-523 serves as the SASE or BITS that
is a common source for the frequency and phase synchronization necessary in any digital network element (transmission or switching).
2.02 The SASE/BITS distributes all timing (frequency and phase) required by other clocks within that
building. An SASE/BITS may receive its reference
signal(s) from either a local Primary Reference G.811
clock (PRC), a network timing interface (reference
connection), or another SASE/BITS. The reference
signals must be generated from a clock of equal or
greater accuracy than the SASE/BITS that uses the
reference. Under normal operating conditions, all
clock signals are PRC compliant with ITU recommendation G.811.
2.03 The DCD clocks within the DCD-523 provide
long-term averaging of the input reference. If the input is disrupted or is out of tolerance, the DCD clock
provides the necessary bridge in timing (holdover)
and allows the network to continue to operate slipfree for several hours or days, depending on the clock
Page 3
TMSL 097-45230-01
2.04 The DCD-523 provides system-wide synchronization via E1, DS1, analog, CC, and/or TTL/RS-422
output timing signals. The DCD-523 regenerates a
clocking signal from its input reference and buffers
short-term timing variations. The DCD-523 also permits unrestricted 64 kb/s cross-connection between
equipment within an office.
2.05 DS1 or E1 output timing signals use a
framed, all-ones format. Analog output can be
used for digital switches, radio, and FDM carriers.
An E1 clock signal can be inserted into a trafficbearing facility, synchronizing the facility to the
DCD-523 timing signal.
2.06 The DCD-523 provides synchronized distribution of timing signals for channel banks, digital
switches, PBXs, digital cross-connect systems, SDH
terminals, ISDN hardware, and other devices that
interconnect with a digital network.
2.07 The DCD-523 can perform nonintrusive monitoring, measurement, and data-processing functions. Its data gathering capabilities can be
interfaced to the customer’s Operations Support System (OSS) network via TL1. This gives users the
ability to monitor and gather performance data on
their synchronization network from a remote monitoring center. An example would be the use of Symmetricom’s PC application, the TimeScan, used with
the MIS card to interface with the DCD-523.
2.08 The DCD-523 can interface with Symmetricom's DCD-LPR and DCD-Cs. Either source is a
PRC. The DCD-LPR uses reference signals from the
Global Positioning System (GPS) satellites and is a
G.811 source traceable to Universal Coordinated
Time (UTC). The DCD-Cs is a self-contained cesium
timing source.
3. DESCRIPTION
3.01 The DCD-523 Systems are designed for modular growth. A DCD-523 System can be as simple as
one master shelf. Up to three expansion shelves can
be added to the master shelf, and output slots may be
equipped as needed.
Page 4
Issue 13: Mar 00
3.02 A fully equipped master or expansion shelf, depending on whether it is configured for protected or unprotected outputs, may require up to two interface
panels (see Figure 1). An interface panel can be a wirewrap panel or a modular mounting panel (MMP). Two
MMPs, two wire-wrap panels, or a combination of the
two per shelf may be used. Each shelf (master and expansion) comes equipped with one interface panel. Additional interface panels may be ordered.
3.03 If additional outputs are needed, a remote system can be installed. A remote system is a DCD-523
System in another rack that uses timing outputs
from the master system. The master and expansion
shelves are usually mounted in the same rack, within the reach of the inter-shelf ribbon cables.
3.04 Two versions of DCD-523 Shelf exist. One version of the shelf (090-45230-03) allows for “hitless”
switching of the timing signals to a hot spare when
TOCA or TOTA-5 cards are installed. The other version of the shelf (090-45230-01) momentarily breaks
the output while switching from the TO card to an
HS card. Both shelves are otherwise identical.
3.05 The shelves in the DCD-523 System house
modular cards that:
• accept reference inputs and provide for protection switching of faulty references
• regenerate a highly stable frequency or timing
signal
• produce timing signal and time code outputs in
several formats
• insert a synchronization clock signal into a traffic-bearing DS1 or E1 data stream
• provide for protection switching of faulty timing
signal and time code outputs
• centralize the command and control interface for
the DCD-523 System
• operate in conjunction with a DCD-LPR to provide primary reference sources
Issue 13: Mar 00
TMSL 097-45230-01
DCD-LPR or TIMESOURCE
INTERFACE PANEL
(Note 2)
Master Shelf
Assembly
Expansion
Shelf Assembly
MASTER SHELF
263 mm (10.35 in)
89 mm (3.5 in) for Wire-wrap Panel
133 mm (5.25 in) for MMP
INTERFACE PANEL
(Note 2)
89 mm (3.5 in) for Wire-wrap Panel
133 mm (5.25 in) for MMP
263 mm (10.5 in)
INTERFACE PANEL
(Note 2)
89 mm (3.5 in) for Wire-wrap Panel
133 mm (5.25 in) for MMP
INTERFACE PANEL
(Note 2)
89 mm (3.5 in) for Wire-wrap Panel
133 mm (5.25 in) for MMP
EXPANSION SHELF #2
Expansion
Shelf Assembly
89 mm (3.5 in) for Wire-wrap Panel
133 mm (5.25 in) for MMP
INTERFACE PANEL
(Note 2)
EXPANSION SHELF #1
Expansion
Shelf Assembly
133 mm (5.25 in) for DCD-LPR
(Note 1)
263 mm (10.5 in)
INTERFACE PANEL
(Note 2)
89 mm (3.5 in) for Wire-wrap Panel
133 mm (5.25 in) for MMP
INTERFACE PANEL
(Note 2)
89 mm (3.5 in) for Wire-wrap Panel
133 mm (5.25 in) for MMP
EXPANSION SHELF #3
263 mm (10.5 in)
584 mm (23.0 in)
Notes:
1. A fully equipped unprotected expansion shelf requires two interface panels.
2. Interface panels can be a wire-wrap panel, or an MMP panel containing selected modules
to accommodate the needs of different timing input and output cards installed in the shelves.
3. A fully equipped unprotected expansion shelf requires two interface panels.
Figure 1. DCD-523 Rack Layout
Page 5
TMSL 097-45230-01
Issue 13: Mar 00
3.08 For a shelf with 1:N protection of outputs, use
slots TO1 through TO10 for protected or unprotected
timing output (TO) cards. Unprotected clock insertion and PSM cards may be installed. Use HS1 and
HS2 for hot spares to protect TO cards.
A. Master Shelf
3.06 All DCD-523 Systems have a master shelf
equipped with an interface panel. This shelf accepts
reference inputs, develops a stable frequency or timing signal, and provides the central system alarm
and maintenance interface. A matrix card in the
shelf switches the timing signal from a faulty output
card to a single hot spare output card in a 1:N protection mode.
3.09 If 1:N protection is not used, the HS1 and HS2
slots may be used for active TO, clock insertion, and
PSM cards. Do not install an MCA card in a shelf
that does not use 1:N protection.
3.10 For card pairs with redundant protection of
outputs, use only slot pairs TO1/TO2, TO3/TO4,
TO5/TO6, TO7/TO8, TO9/TO10, and HS1/HS2.
3.07 The master shelf houses the following cards:
• Clock input
• Clock
3.11 Cabling requirements for outputs that are unprotected differ from outputs with redundant protection.
• Timing output
• Clock insertion
3.12 Figure 2 shows the master shelf equipped with
rubidium clock cards; Figure 3 shows the master
shelf equipped with quartz clock cards.
• Precision Synchronization Monitor (PSM)
• Matrix controller
Note: Use the MCA slot for an MCA card
only.
• Alarm/Maintenance
-48V A
5A
-48V B
5A
OUTPUT PROTECTION
TO1
DIGITAL CLOCK DISTRIBUTOR
DCD–523
CLOCK
INPUT A
CLOCK
INPUT B
CLOCK INPUT
CLOCK A
CLOCK B
CLOCK
TO2
TO3
TO4
TO5
TO6
TO7
SPARE SELECT
TO8
TO9
TO10
HS 1
HS 2
TO4 TO5 TO6 TO7 TO8 TO9 TO10 HS1 HS2 MCA
OUTPUT, PSM, OR
CLOCK INSERTION
ALARM/
MAINT.
ALARM/
MAINTENANCE
OUTPUT PROTECTION
Figure 2. Master Shelf Equipped with Rubidium Clock Cards
Page 6
Issue 13: Mar 00
-48V A
5A
TMSL 097-45230-01
-48V B
5A
OUTPUT PROTECTION
TO1
DIGITAL CLOCK DISTRIBUTOR
DCD–523
CLOCK
INPUT A
CLOCK
INPUT B
CLOCK INPUT
CLOCK A
BLANK PANELS
CLOCK
CLOCK B
TO2
TO3
TO4
TO5
TO6
TO7
SPARE SELECT
TO8
TO9
TO10
HS 1
HS 2
TO1 TO2 TO3 TO4 TO5 TO6 TO7 TO8 TO9 TO10 HS1 HS2 MCA
OUTPUT, PSM, OR
CLOCK INSERTION
ALARM/
MAINT.
ALARM/
MAINTENANCE
OUTPUT PROTECTION
Figure 3. Master Shelf Equipped with Quartz Clock Cards
Page 7
TMSL 097-45230-01
Issue 13: Mar 00
3.14 For a shelf with 1:N protection of outputs, use
slots TO1 through TO10 for protected or unprotected
timing output (TO) cards. Unprotected clock insertion and PSM cards may be installed. Use HS1 and
HS2 for hot spares to protect the TO cards.
B. Expansion Shelf
3.13 Up to three expansion shelves (Figure 4) can
be used with each master shelf. Each expansion shelf
comes equipped with one interface panel; additional
interface panels may be ordered if the number of required outputs on a single shelf exceeds the maximum interface card capacity. An MCA card in the
shelf switches the timing signal from a faulty output
card to a HS TO card. Each expansion shelf can
house the following cards:
3.15 If 1:N protection is not used, the HS1 and HS2
slots may be used for active TO, clock insertion, and
PSM cards. Do not install an MCA card in a shelf
that does not use 1:N protection.
3.16 For card pairs with redundant protection of
outputs, use only slot pairs TO1/TO2, TO3/TO4,
TO5/TO6, TO7/TO8, TO9/TO10, and HS1/HS2. Cabling requirements for outputs that are unprotected
differ from outputs with redundant protection.
• Timing output
• Clock insertion
• Matrix controller
Note: Use the MCA slot for an MCA card
only.
• Alarm/Maintenance
• Precision Synchronization Monitor
-48V A
5A
-48V B
5A
OUTPUT PROTECTION
DIGITAL CLOCK DISTRIBUTOR
DCD–523
BLANK PANELS
CLOCK INPUT
(Note)
PSM
TO1
TO2
TO3
TO4
TO5
TO6
TO7
SPARE SELECT
TO8
TO9
TO10
HS 1
HS 2
TO1 TO2 TO3 TO4 TO5 TO6 TO7 TO8 TO9 TO10 HS1 HS2 MCA
OUTPUT, PSM, OR
CLOCK INSERTION
ALARM/
MAINT.
ALARM/
MAINTENANCE
OUTPUT PROTECTION
Note: Timing for the expansion shelf is provided by the master shelf, so clock input cards are not required.
Figure 4. Expansion Shelf
Page 8
Issue 13: Mar 00
C. Remote Wire-wrap Panel
3.17 Another method of adding outputs is via a remote wire-wrap panel. The remote wire-wrap panel
is designed to be mounted in network element bays
remote from the DCD-523 rack (see Figure 5).
3.18 The remote wire-wrap panel is used when a
cluster of NEs are located in another location in the
building, especially on a different floor. It is more efficient to run one or two 25-pair cables to the remote
wire-wrap panel located in the NE cluster, than to
run multiple, individually shielded twisted pair cables directly from the DCD Shelf to each NE in the
cluster.
MASTER OR REMOTE
SHELF SYSTEM
TMSL 097-45230-01
3.19 The overall distance between the DCD Shelf,
the remote wire-wrap panel, and the NEs being
timed should not exceed 457 meters (1500 feet) for
TOCA outputs, and 200 meters (655 feet) for TOTA
outputs.
3.20 The remote wire-wrap panel is capable of carrying up to 100 DCD outputs. However, it is recommended that no more than 40 outputs be remote
from any one shelf. If more than 40 outputs are required, a remote shelf system should be installed.
CONNECTORIZED CABLE ASSEMBLY (UP
TO 457 m (1500 ft) FOR TOCA, 200 m (655 ft)
FOR TOTA); ONE PER 20 REMOTE PORTS
WIRE-WRAP PANEL
NETWORK ELEMENTS
MASTER OR
EXPANSION
SHELF ASSEMBLY
REMOTE
WIRE-WRAP PANEL
Figure 5. DCD Shelf Wire-wrap Panel to Remote Wire-wrap Panel Connection
Page 9
TMSL 097-45230-01
Issue 13: Mar 00
D. Remote System
TOGA cards). For additional information, refer to
the Installation section of this manual.
3.21 The DCD-523 System can act as a timing master to drive remote DCD-523 Systems (Figure 6). Remote systems can locate timing outputs closer to
their destinations. One remote system can maintain
full communications with an Operations Support
System (OSS) through the master system.
3.24 In case the signals from the master system
fail, one or two ST3 clock cards may be installed in
the remote system master shelf to provide holdover
timing during a signal interruption.
E.
3.22 A remote system consists of a master shelf located in another rack in the same building. If communications are not required, remote systems may
contain a master shelf and up to three expansion
shelves, set up the same way as a master system.
DCD-LPR
3.25 A DCD-LPR System can be used in association
with a DCD-523 System to create an integrated Local Primary Reference source and distribution synchronization system (Figure 7). The DCD-LPR Shelf
should be located in the rack space immediately
above the DCD-523 master shelf. The DCD-LPR requires two inputs that can be supplied by the
DCD-523 System.
3.23 The master and remote systems can be
equipped for phase-aligned timing signals (via an
output apiece from two TOCA cards) or G.703 timing
signals (via an output apiece from two TOEA or
MASTER SYSTEM
REMOTE SYSTEM (NOTE 1)
MIS–TO–MIS RS-232
MASTER
SHELF
INPUT
REFERENCES
A
L
A
R
M
S
EXPANSION
SHELF
EXPANSION
SHELF
INTRASYSTEM
TIMING
MASTER
SHELF
FROM
LOCAL
SYSTEM
TOCA
CARDS
Notes:
1. The remote system master shelf must be equipped with two clock input cards optioned to accept two
feeds from the DCD-523 master system. The remote system may be equipped with one or two clock
cards (ST3 cards are required for phase-aligned systems) to provide timing holdover if a fault occurs.
2. If communications outside the system are not required, the MIS-to-MIS cable is not required, and both
the master system and the remote system may have up to three expansion shelves apiece.
Figure 6. Master to Remote System Connection
DCD-LPR
5 MHz INPUTS
TO DCD-LPR
PRIMARY REFERENCE
SOURCE INPUTS
DCD-523 MASTER SHELF
Figure 7. DCD-523 to DCD-LPR Connection
Page 10
Issue 13: Mar 00
F.
Cards
3.26 Table A lists the cards that may be installed in
a DCD-523 System.
3.27 Clock input cards are required in the DCD
master shelf (in master and remote systems). Remote system master shelves should only be equipped
with CI cards optioned for composite clock (CC) if the
master shelf supplies timing via TOCA cards. Expansion shelves (in master and remote systems) do
not require clock input or clock cards. A ribbon cable
delivers system timing from the master shelf to each
expansion shelf.
3.28 In a master system master shelf, the following
clock input card combinations may be installed:
•
•
•
•
•
•
Two MRC cards
Two CI-EA cards
Two CI cards
Two ACI cards
Two DCIM cards
One CI card and one ACI card
TMSL 097-45230-01
3.29 Table B shows which output cards can be used
in each protection mode unprotected (stand-alone),
1:1, 1+1, and 1:N.
3.30 If a shelf does not require 1:N protection, the
HS TO slots may be filled with unprotected one or
two TO cards, SCIU/ESCIU cards, or a PSM card.
Another interface panel must be installed to accommodate the extra outputs or inputs.
3.31 All MI slots in a DCD System must be
equipped with MIS cards of the same part number
and software revision, or with SAI cards.
3.32 Version 5 cards require an MISV5 card in the
shelf to communicate data and manage the system.
An expansion shelf with an MISV5 card requires an
MISV5 card in the master shelf to communicate all
synchronization and management data to the OSS.
An MCA-5M card is required to manage Version 5
cards in 1:N protection.
3.33 All slots in a shelf should be covered. If a shelf
is not covered by a card, cover the slot with a blank
plug-in card or a blank panel (Table C).
Page 11
TMSL 097-45230-01
Issue 13: Mar 00
Table A. DCD-523 System Cards
CARD
PART NUMBER
DESCRIPTION
MASTER
SHELF
EXPANSION
SHELF
CLOCK INPUT CARDS
ACI
090-41924-01
Analog Clock Input
X
—
CI
090-40010-01
Clock Input
X
—
CI -EA
090-41910-03
Clock Input, E1 or Analog
X
—
DCIM-EAV5
090-45010-59
Dual Clock Input Messaging, E1 or
Analog (Note 2)
X
—
DCIM-TV5
090-45010-50
Dual Clock Input Messaging, T1
(Note 2)
X
—
MRC-EA
090-45010-06
Multiple Reference Controller, E1 and
Analog (Note 2)
X
—
MRC-EA
090-45010-07
Multiple Reference Controller, E1 and
Analog (Notes 2, 3)
X
—
MRC-EAV5
090-45010-56
Multiple Reference Controller, E1 and
Analog (Note 2)
X
—
MRC-EAV5
090-45010-57
Multiple Reference Controller, E1 and
Analog (Notes 2, 3)
X
—
MRC-T
090-45010-03
Multiple Reference Controller, T1
(Note 2)
X
—
MRC-T
090-45010-08
Multiple Reference Controller, T1
(Notes 2, 3)
X
—
MRC-TV5
090-45010-53
Multiple Reference Controller, T1
(Note 2)
X
—
MRC-TV5
090-45010-58
Multiple Reference Controller, T1
(Notes 2, 3)
X
—
CLOCK CARDS
ST2E
090-40017-02
Enhanced Stratum-2 Clock
X
—
ST2
090-40017-01
Stratum-2 Clock
X
—
ST3E
090-40019-01
Enhanced Stratum-3 Clock (Maj/Min
Alarm)
X
—
ST3E
090-40019-03
Enhanced Stratum-3 Clock (Maj Alarm)
X
—
ST3E
090-40019-11
Enhanced Stratum-3 Clock (Note 7)
X
—
ST3E
090-40019-13
Enhanced Stratum-3 Clock (Note 7)
X
—
ST3
090-40013-01
Stratum-3 Clock
X
—
TNC-E
090-40017-03
Enhanced Transit Node Clock
X
—
Page 12
Issue 13: Mar 00
TMSL 097-45230-01
Table A. DCD-523 System Cards (Contd)
CARD
PART NUMBER
DESCRIPTION
MASTER
SHELF
EXPANSION
SHELF
CLOCK CARDS (Contd)
TNC
090-40020-02
Transit Node Clock
X
—
LNC
090-40019-02
Local Node Clock
X
—
TIMING OUTPUT AND INSERTION CARDS (Note 4)
EA10V5
090-45029-52
Timing Output E1 and Analog
X
X
EA10MV5
090-45029-54
Timing Output E1 and Analog Messaging
X
X
TOAA
090-40022-xx
Timing Output Analog Automatic
X
X
TOAA
090-40028-10
Timing Output Analog Automatic
X
X
TOCA
090-40011-02
Timing Output Composite Clock
Automatic
X
X
TOEA
090-40027-01
Timing Output E1 Automatic
X
X
TO-EA
090-40029-01
Timing Output E1 and Analog
X
X
TO-EA5V5
090-45029-51
Timing Output E1 and Analog
X
X
TO-EANV5
090-45029-56
Timing Output E1 and Analog, 1:N
X
X
TOGA
090-40022-07
Timing Output G.703 Automatic
X
X
TOLA
090-40023-xx
Timing Output Logic Level Automatic
X
X
TOTA
090-40012-02
Timing Output T1 Automatic
X
X
TOTA-5V5
090-45012-52
Timing Output T1 Automatic (Note 5)
X
X
TOTA-MV5
090-45012-53
Timing Output T1 Automatic Messaging
(Note 5)
X
X
TOTL
090-40012-03
Timing Output T1 with LBO
X
X
SCIU
090-40021-01
Synchronous Clock Insertion Unit
X
X
ESCIU
090-45021-01
E1 Synchronous Clock Insertion Unit
X
X
MONITOR CARDS (Note 6)
PSM-E
090-45025-02
Precision Sync Monitor, E1
X
X
PSM-EV5
090-45025-52
Precision Sync Monitor, E1
X
X
PSM-EAV5
090-45025-54
Precision Sync Monitor, E1 and Analog
X
X
Page 13
TMSL 097-45230-01
Issue 13: Mar 00
Table A. DCD-523 System Cards (Contd)
CARD
PART NUMBER
DESCRIPTION
MASTER
SHELF
EXPANSION
SHELF
MONITOR CARDS (Note 6) (Contd)
PSM-T
090-45025-01
Precision Sync Monitor, T1
X
X
PSM-TV5
090-45025-51
Precision Sync Monitor, T1
X
X
PSM-TV5
090-45025-53
Precision Sync Monitor, T1
X
X
ALARM/MAINTENANCE CARDS
MIS
090-45018-04
Maintenance Interface System (Note 8)
X
X
MIS
090-45018-14
Maintenance Interface System (Note 8)
X
X
MISV5
090-45018-05
Maintenance Interface System (Note 8)
X
X
MISV5
090-45018-25
Maintenance Interface System (Note 8)
X
X
MISV5
090-45018-35
Maintenance Interface System (Note 8)
X
X
SAI
090-45014-02
System Alarm Interface
X
X
PROTECTION MANAGEMENT CARD
MCA-5
090-45015-01
Matrix Controller Automatic-5
X
X
MCA-5MV5
090-45015-55
Matrix Controller Automatic-5
Messaging
X
X
Notes:
1. The V5 indicates that this is a Version 5 card.
2. If one of these cards is installed on a shelf, both cards in the same shelf must have the same part number.
3. ITU G.812 Type 1 compliant.
4. Some restrictions apply to TO cards when 1:N protection is used; Table D describes incompatibilities among TO
cards.
5. Some restrictions apply to TOTA cards when 1:N protection is used; Table E describes incompatibilities among
TOTA cards.
6. Do not install a 090-45025-01 PSM-T card in the same shelf with a 090-45025-52, -54, -51, or -53 PSM card.
7. Holdover delay increased for SSM compatibility.
8. See Part 5B, MIS Card, for compatibility with versions of the MIS card.
Page 14
Issue 13: Mar 00
TMSL 097-45230-01
Table B. Protection Modes for Output Cards
MCA-5 (Note 1)
MCA-5M (Note 1)
U
U
SAI or MIS
SW Version
(Note 2)
Output Card
Standalone
1:1
1+1
1:N
EA-10
Y
Y
Y
N
—
—
5.02.xx
EA-10M
Y
Y
Y
N
—
—
5.04.xx
TOAA
Y
N
N
Y
Y
— —
—
Y
— —
—
SAI, any MIS
TOCA
Y
N
N
Y
Y
— —
—
Y
— —
—
SAI, any MIS
TOEA
Y
N
N
Y
Y
Y
—
Y
Y
—
SAI, any MIS
TO-EA
Y
N
Y
N
—
—
SAI, any MIS
TO-EA5
Y
Y
Y
N
—
—
5.02.xx
TO-EAN
Y
N
N
Y
N
N
N
—
Y
Y
Y
—
5.05.xx
TOGA
Y
N
Y
Y
Y
— —
—
Y
— —
—
SAI, any MIS
TOLA
Y
N
N
Y
Y
— —
—
Y
— —
—
SAI, any MIS
TOTA
Y
N
N
Y
Y
Y
—
—
Y
Y
—
—
SAI, any MIS
TOTA-5
Y
N
N
Y
Y
Y
N
—
Y
Y
Y
—
5.02.xx with
MCA-5
(5.05.xx with
MCA-5M)
TOTA-M
Y
N
N
Y
Y
Y
N
N
Y
Y
Y
Y
5.05.xx
TOTL
Y
N
N
Y
Y
— —
—
Y
— —
—
SAI, any MIS
SCIU
Y
N
N
N
—
—
SAI, any MIS
ESCIU
Y
N
N
N
—
—
SAI, any MIS
F
A
—
S
F
A
—
S
Notes:
1. An MCA-5 or MCA-5M card is required in a shelf using 1:N protection. The type of MCA card affects the
function of the output cards after a 1:N protection switch. The key for abbreviations in the headings of the
columns are:
U: Use with card in 1:N protection
F: Frame alignment of HS card during 1:N protection switch
A: Alarm severity, Ports in service, Trouble codes transferred to HS card during 1:N protection switch
S: SSM codes transferred to HS card during 1:N protection switch
2. The software version listed in the column, or a later version, must be installed in the MIS card in the shelf.
3. The key for abbreviations in the body of the table:
Y: Function can be used
N: Function cannot be used
—: Not applicable
4. The 090-40028-10 TOAA card cannot be used in 1:N protection.
Table C. Slot Covers
PART #
DESCRIPTION
Table C. Slot Covers (Contd)
PART #
DESCRIPTION
090-45098-01
Single-slot blank plug-in card
970-00243-02
8-slot cover panel
970-00243-01
11-slot cover panel
970-00014-02
3-slot cover panel
Table D. 1:N TO Card Incompatibility
Page 15
TMSL 097-45230-01
Issue 13: Mar 00
Table D. 1:N TO Card Incompatibility (Contd)
CARD IN HS
SLOT
DO NOT INSTALL IN SHELF
TOAA-02
TOAA-01, TOAA-03, TOLA-07
TOAA-03
TOAA-01, TOAA-02, TOLA-07
TOAA-05,
TOAA-15
No restrictions
TOCA
TOLA-05
TOEA, TOGA,
TO-EAN
No restrictions
TOLA-01
Table E. 1:N TOTA Card Compatibility
with MCA-5M Card
TO CARDS
INSTALLED IN SHELF
CARD REQUIRED IN
AN HS SLOT
TOTA-M
TOTA-M
TOTA-M & TOTA-5
TOTA-M
TOTA-M & TOTA
TOTA-M
TOTA-M & TOTA-5 &
TOTA
TOTA-M
TOTA-5 & TOTA
TOTA-5 or TOTA-M
TOLA-02, TOLA-04
TOTA-5
TOTA-5 or TOTA-M
TOLA-02
TOLA-01, TOLA-04
TOTA
TOLA-03
No restrictions
TOTA or TOTA-5 or
TOTA-M
TOLA-04
TOLA-01, TOLA-02
TOLA-05
TOCA
TOLA-06
TOTA, TOTA-5, TOTL
TOLA-07
TOAA-01, TOAA-02, TOAA-03
TOTA, TOTA-5
TOTL, TOLA-06
TOTL
TOTA, TOTA-5, TOLA-06
Page 16
Note: The MCA-5 card can be used, but it transfers
only the framing parameters when making a protection switch. The MCA-5M card transfers framing
parameters, individual port configurations, trouble
codes, alarm severity, and SSM codes.
Issue 13: Mar 00
TMSL 097-45230-01
G. Interface Panels and Interface Modules
the interface panel, additional panels may be ordered;
any combination of panels may be used.
3.34 Connections between the DCD-523 System
and external equipment are made at the wire-wrap
panel, or at interface modules mounted onto a modular mounting panel (MMP).
Interface Panels
3.37 An MMP provides ten mountings for ten interface modules for various cable interfaces. Interface
modules allow the appropriate connector to be used
for each connection between the DCD Shelf and network elements.
3.35 An interface panel can be an ANSI-Class MMP
(Figure 8), a wire-wrap panel (Figure 10), an ITUClass MMP (Figure 11), or an ITU-Class Output
MMP (Figure 9). A supplied ribbon cable carries signals between the connector position on the interface
panel and the slot connector on the rear panel of the
shelf.
3.38 The remote wire-wrap panel (Figure 12) is designed to be mounted remotely in network element
bays. It is cabled to the DCD Shelf wire-wrap panel
using 25-pair ABAM cable with a 50-pin ISD connector, with a metal hood on the remote wire-wrap panel
end. Each cable can transfer 20 DCD outputs to the
remote panel location.
3.36 Each interface panel accommodates external connections for up to 10 cards. Each shelf comes equipped
with an interface panel. If the number of external connections required exceeds the number of connections on
Note: It is recommended that no more than
40 outputs be transferred to a remote wirewrap panel from any one shelf. If more than 40
outputs are required, install a remote system.
GND
GND
TB1
TB2
OUTPUT 10
OUTPUT 9
OUTPUT 8
OUTPUT 7
OUTPUT 6
OUTPUT 5
OUTPUT 4
OUTPUT 3
OUTPUT 2
OUTPUT 1
Figure 8. ANSI-Class MMP
1 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 910
T010
DL8
T01
J10
J1
Figure 9. Wire-wrap Panel
Page 17
TMSL 097-45230-01
Issue 13: Mar 00
523 MASTER OUTPUT PANEL
089-45230-33 REV ____
TB2
TB1
FRM
REF A INPUT
FRM
TO 1
REF B INPUT
TO 8
TO 7
TO 6
TO 5
TO 4
TO 3
TO 2
J1
J2
J18
J17
J3
J4
J5
J6
J7
J8
REF A INPUT
REF B INPUT
TO 8
TO 7
TO 6
TO 5
TO 4
TO 3
TO 2
TO 1
J9
J10
J20
J19
J11
J12
J13
J14
J15
J16
Figure 10. ITU-Class MMP
TB2
TB1
FRM
523 EXPANSION OUTPUT PANEL
089-45230-34 REV ____
FRM
TO 10
TO 9
TO 8
TO 7
TO 6
TO 5
TO 4
TO 3
TO 2
TO 1
J17
J18
J1
J2
J3
J4
J5
J6
J7
J8
TO 10
TO 9
TO 8
TO 7
TO 6
TO 5
TO 4
TO 3
TO 2
TO 1
J19
J20
J9
J10
J11
J12
J13
J14
J15
J16
Figure 11. ITU-Class Output MMP
1 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 9101 2 3 4 5 6 7 8 910
GND
TO10
TO9
TO8
TO7
TO6
TO5
TO4
J14
TB2
J15
J10
J9
TO2
TO1
GND
J12
J8
J7 J13
CONNECTORIZED WIRE WRAP PANEL
J6
J5
J4
089-40003-01 REV _____
Figure 12. Remote Wire-wrap Panel
Page 18
TO3
S
T
R
J3 J11
J2
MADE IN USA
J1
TB1
Issue 13: Mar 00
TMSL 097-45230-01
Interface Modules
3.39 Interface modules connect to an MMP, so that
input reference signals, timing output signals, and
monitored signals may be connected to the cards in
the shelf. Different modules contain different types
of connectors, so the proper type of cable connector
can be attached to the module.
Note: The 090-40028-10 TOAA card provides
BNC connectors for its outputs on the front
panel of the card, and does not require an interface module.
3.40 Each reference input module contains a
switch to tie the cable shield to frame ground. Tying
the shield to ground is ordinarily not required, but
may be used in noisy environments to reduce noise.
Set the switch to FGND to tie the cable shield to
frame ground, or OPEN to leave the cable shield
open (floating).
3.41 A module is associated with a slot in the shelf.
A stand-alone card requires a single-wide output
module. All redundant output card pairs require a
double-wide output module to provide redundantpair output protection. A PSM card, which occupies
two TO slots, requires one single-wide module per
card.
H. Bridging Isolator Module
Figure 14) must be used; these may be purchased
from Symmetricom or an outside vendor. Symmetricom offers a variety of bridging isolator modules.
3.43 The bridging isolator is installed in-line in a
traffic-carrying CEPT/E1 bitstream. It provides no
loss to the traffic-carrying E1 signal. It also provides
one or three 750 Ω high-impedance bridged output
connections which have a 20.8 dB (or 20 dB) isolation
from the traffic signal. A bridged output connection
may be used to drive a DCD Shelf input, or an input
to a PSM card. The signal grounds are carried
through the bridging isolator for both the traffic signal and the bridged signal.
3.44 For additional information regarding the
bridging isolation module, refer to the Installation
section of this manual.
I.
Card Quantities
3.45 Table F lists the maximum number of cards of
any single type that may be installed in a master or
an expansion shelf.
Caution: Some restrictions apply when selecting TO and HS TO cards. If an HS TO
card is not compatible with a TO card installed in either a TO or HS slot, incorrect
protection switching could occur. Refer to
for a list of incompatible HS TO and TO
cards.
3.42 If bridged connections are required for E1 signals, a bridging isolator module (Figure 13 and
DO
NOT
USE
TO DCD SHELF
OUT
TO
DCD
SHELF
IN
R T S S R T R T
E1 ISOLATOR MODULE
T.R OUT
E1
IN
T.R IN
T.R BRDG
E1
OUT
10 9 8 7 6 5 4 3 2 1
Note: The number and type of connectors change
(one or three BNC, SMB, or Siemens1.6/5.6)
depending on the isolator module ordered.
E1 BRIDGING
ISOLATOR
Figure 13. E1 Bridging Isolator Module
Figure 14. Wire-wrap Bridging Isolator Module
Page 19
TMSL 097-45230-01
Issue 13: Mar 00
Table F. Card Quantities (Max. Number per Shelf)
MASTER SHELF
ST2E/ST2/TNC-E
ST3E/TNC/LNC
EXPANSION
SHELF
Clock Input Cards (Note 1)
2
2
—
Clock Cards (ST2E, ST2,TNC-E) (Note 2)
2
—
—
Clock Cards (ST3E, ST3, TNC, LNC)
—
2
—
Stand-alone
(unprotected):
9 TO cards
Stand-alone
(unprotected):
12 TO cards
Stand-alone
(unprotected):
12 TO cards
Redundant
protected: 4 pairs
1:N protected:
7 TO cards and
2 HS TO cards
Redundant
protected: 6 pairs
1:N protected:
10 TO cards and
2 HS TO cards
Redundant
protected: 6 pairs
1:N protected:
10 TO cards and
2 HS TO cards
HS TO
2
2
2
MIS or SAI (Note 5)
1
1
1
9 unprotected
12 unprotected
12 unprotected
CARD
Timing Output (TO) (Notes 3 and 4)
SCIU or ESCIU
MCA-5 or MCA-5M
1 (only if 1:N output protection is required)
PSM-E and PSM-T (Note 6)
2
2
5
PSM-EV5, PSM-EAV5, PSM-TV5 (Note 6)
4
5
6
Notes:
1. The MR A and MR B clock input slots are double-wide slots; if ACI cards (single-slot wide cards) are installed,
install a blank card (p/n 090-45098-01) in the empty slot to the right of the ACI card.
2. The second ST2E, ST2, or TNC-E card physically occupies the TO1 through TO3 output slots, so these slots
cannot be used for output, clock insertion, or monitor cards.
3. Some restrictions apply to TO cards when 1:N protection switching is used; see Tables D and E for TO card
incompatibilities.
4. A TOTA-M card may be installed in the same shelf as a TOTA-5 card; however, there may be delays in SSM
messaging.
5. If the master shelf is equipped with MIS cards, the expansion shelves must be equipped with MIS cards; the
combination of MIS and SAI cards is not allowed.
6. A maximum of seven 090-45025-02 or -01 PSM cards are allowed in a single system (two in the master shelf
and five throughout the expansion shelves, whether the system is a master or a remote system).The maximum
number of 090-45025-52, -54, -51, or -53 PSM cards allowed in a single system is limited only to the number of
available TO slots in the shelf. The shelf support bar does not allow installation of a PSM card into the TO3 slot.
Page 20
Issue 13: Mar 00
4. SYSTEM DESCRIPTION
TMSL 097-45230-01
• E1/2.048 MHz G.703 input reference signals, either 0 dB (terminated) or –20 dB (bridged).
A. System Architecture
4.01 The system architecture (Figure 15) is based on
four 4 kHz buses. This quad bus provides a highly redundant timing architecture. Each clock card and
clock input card drives a separate bus. The output
cards select the highest priority bus, and use that signal to develop a timing output in the proper frequency
and format.
4.02 The shelf contains an internal communications
bus to administer shelf functions and communicate
with an external reporting system.
4.03 In multi-shelf systems, the master shelf develops the timing signals for the quad bus. Cables carry
the quad bus to the expansion shelves. Each expansion
shelf has its own internal communications bus for administering and reporting its own shelf functions.
B. System Power
4.04 The DCD-523 Systems are powered by two separate –48 V dc office battery inputs. Both –48 V dc inputs are fused on the shelf, then bused to each of the
cards in the shelf. Input range is –42 V to –56 V. Each
card contains a dc-to-dc converter to provide its own dc
supply voltages.
C. Input Signals
4.05 Clock input cards accept input signals of various formats, and discipline the clock cards. Input signals are arranged in pairs and designated A (primary)
and B (secondary) (see Figure 15). Input reference signals are typically:
• Analog input reference signals of 1 MHz, 2 MHz,
5 MHz, or 10 MHz.
4.06 One or more input signals are applied to each
clock input card, which drive the clock cards. The clock
cards are phase-locked to the input signal and provide
outputs to the TO cards.
4.07 If multiple reference signals are desired, use
MRC or DCIM cards. An MRC card accepts up to four
reference input signals. The MRC card continuously
monitors each of the provisioned reference inputs,
checking for signal integrity, digital transmission errors, and frequency variations. A DCIM card accepts
up to two reference input signals, and continuously
monitors each of the provisioned reference inputs,
checking for signal integrity and digital transmission
errors.
4.08 All DCD-523 clock input cards provide an internal 4 kHz clock locked to the input reference signal(s)
to discipline the shelf clock cards. The 4 kHz clock signal also drives a line in the quad bus, to provide redundancy if a failure occurs in a clock card.
D. Clocks
4.09 The clock cards regenerate timing from the input signal and send it to timing output cards via the
quad bus. A variety of clocks are available for installation in the DCD-523. These clocks, typically installed
in pairs, provide independent, fully-redundant oscillators. The clocks installed determine the stability level
available if the system must go into holdover.
• DS1 input reference signals, either 0 dB DSX
(terminated) or –20 dB DSX (bridged).
Page 21
TMSL 097-45230-01
Issue 13: Mar 00
INPUT
REFERENCE A
UP TO 4 INPUTS
(See Note 2)
CLOCK
CARD A
XFR
CLOCK
INPUT B
DS1 OR E1
DATA
STREAM IN
ESCIU
OR
SCIU
CARD
SYNCHRONIZED DS1
OR E1 DATA
STREAM OUT
HS
TO
(see
Note 1)
XFR
INPUT
REFERENCE B
TIMING
OUTPUT
SIGNALS
TO
CARD
CLOCK
INPUT A
CLOCK
CARD B
UP TO 4 INPUTS
PSM
(See Note 2)
MCA-5
MCA-5M
TIMING
SIGNALS TO
BE MONITORED
SWITCH CONTROL
TO RELAY MATRIX
(See Note 2)
RELAY
MATRIX
OUTPUT CARD
PORT ALARMS
RS-232
COMMUNICATIONS
(See Note 2)
SYSTEM
ALARMS
AND STATUS
SAI
OR
MIS
ACO
SYSTEM
ALARM BUS
(FROM ALL CARDS)
4 kHz
TIMING
BUS
(See Note 2)
–48 V B
–48 V A
5A
SHELF
COMMUNICATIONS
BUS (See Note 2)
TO EXPANSION
SHELF
Notes:
1. Two HS TO cards may be equipped. However, only one TO may be placed in-service at a time.
2. This communications path is available only if the shelf is equipped with an MIS card.
Figure 15. DCD-523 System
Page 22
Issue 13: Mar 00
E.
TMSL 097-45230-01
Reference Monitoring
4.10 A PSM card provides precision monitoring of
up to four timing reference signals in real time. Detailed information on each reference is available
from the MIS card, using an RS-232 connection and
the TL1 language. Software from Symmetricom
(available separately) provides a graphical user interface for TL1, graphing capabilities for the references monitored, and other functions, such as MTIE
and TDEV.
F.
Timing Output
4.11 TO cards supply timing outputs formatted for
use by equipment and facilities. The type of TO card
installed determines whether the output signals are
composite clock (CC), E1 or 2.048 MHz G.703, DS1,
or logic level (RS-422, RS-423, RS-232). Timing outputs are constantly monitored for activity.
4.12 TO cards monitor the internal quad timing bus
for an input signal. A signal from a clock card has
priority over a signal from a clock input card. Refer
to Table G for input signal selection priority.
put sources. When the card is configured for nonrevertive switching, the four sources on the internal
bus are separated into the following individual
groups:
• Clock source group
• Clock input source group
4.15 In nonrevertive switching, a TO card does not
revert to a higher priority source if that source is
within the same group the TO card is using. The TO
card only reverts to a source in the higher priority
clock source group when the TO card is using a
source from the clock input group.
4.16 For example, a nonrevertive TO card is using
the clock B signal because the clock A signal had
been lost. When clock A is restored, the TO card remains using the clock B signal because it is in the
clock source group. If the TO card had been using the
clock input A signal when clock A is restored, the TO
card reverts to the clock A signal, because it is in the
higher priority clock source group.
G. Output Protection
Table G. Priority of Internal Timing Signals
PRIORITY
CARD SUPPLYING TIMING
1
Clock A (ST A)
2
Clock B (ST B)
3
Clock Input A (CI A)
4
Clock Input B (CI B)
4.13 If a higher priority signal is lost, TO cards
switch to a lower priority signal. When any higher
priority signal becomes available on the quad bus,
most TO cards automatically revert to the higher
priority source.
4.14 The EA10, EA10M, TOTA-5, TOTA-M, TOEA5, TO-EAN, and TO-EA cards need not revert automatically to the higher priority source. These
cards can be set for revertive or nonrevertive switching of the quad bus sources. Nonrevertive switching
reduces the possibility of hits caused by switching in-
4.17 The DCD-523 System can be configured to provide protection for the timing outputs in the shelf.
Card outputs may be protected in a 1:N, 1:1, or 1+1
protection plan, depending upon the cards installed
and the shelf configuration.
1:1 and 1+1 Protection
4.18 EA10, EA10M, TO-EA, TO-EA5, and TOGA
card pairs can be used for protection of timing output
signals. EA10, EA10M, and TO-EA5 cards can provide 1:1 or 1+1 protection; TO-EA and TOGA cards
can only provide 1+1 protection. A double-wide output module is required for a 1:1 or 1+1 pair.
4.19 In 1:1 protection, one card of the pair provides
the active outputs and the other card’s outputs are
squelched. If the active card fails, the outputs of the
other card become active, providing the output signal for the pair. In 1+1 protection, both cards produce output signals at a reduced power level. The
signals are combined at the interface panel to create
a normally powered output. If one card fails, the outputs of the other card are increased to normal power.
Page 23
TMSL 097-45230-01
Note: When installing any redundant pair of
TO cards in a shelf, install the pair in adjacent
slots. Use slot pairs TO1 & TO2, TO3 & TO4,
TO5 & TO6, TO7 & TO8, TO9 & TO10, or HS1
& HS2.
Issue 13: Mar 00
4.27 After a protection switch, the push button above
the alarmed TO card can identify the failed ports. When
the push button is pressed, lamps on the front of the
MCA card identify the failed TO card ports.
1:N Automatic Protection Switching
1:N Protection
4.20 In 1:N protection, one card protects a number
of cards in the same shelf. An MCA-5 or MCA-5M
card is required for 1:N operation. All output card
types can be part of a 1:N protection plan, except the
TO-EA, TO-EA5, the EA series, ESCIU, SCIU, and
090-40028-10 TOAA cards. Certain cards are incompatible with each other in 1:N configurations (Tables
D and E). The same single-wide output module that
carries output signals for a standalone card carries
output signals for a card in the 1:N configuration.
4.21 All cards in a 1:N protection plan should be the
same card type to provide protection for all card
functions.
4.22 The protection card is in an HS slot. Protected
cards may be in any TO slot. Relays in the Output
Protection Matrix select the signal from a TO slot or
the signal from an HS slot to be sent to the output
module. The Output Protection Matrix is controlled
by the MCA-5 or MCA-5M card.
4.23 If a signal from any TO card fails, the MCA
card activates the relays that break the signal path
from the TO card, and make the signal path from the
HS card to the output connectors. The DCD-523 System with the hitless matrix (p/n 090-45230-03)
makes the HS card signal path before breaking the
TO card signal path.
4.24 Only one HS TO card may be in service at a
time. A second HS slot in the shelf permits protection for a second type of TO card.
4.25 The MCA-5 card transfers some parameters
(Table B) during a protection switch. All card types
that support 1:N protection can be switched by the
MCA-5 card.
4.26 The MCA-5M card transfers all the applicable
framing, alarm severities, trouble codes, ports in service, E1 and analog port configuration, and SSM information. The MCA-5M card fully supports the TOEAN and TOTA-M cards. Table B provides further
information.
Page 24
4.28 The MCA card identifies a failed TO card and
automatically performs the protection switch. The
failed card can be replaced at a convenient time. The
HS card remains the active output card until a higher level failure occurs, or until an operator initiates
a switch.
4.29 If the HS card reports the same port alarms as
the original card, the failure is assumed to be external to the TO card and the outputs switch back to the
original TO card. The original card is not allowed to
switch again until the current minor alarm clears, or
until a major or critical alarm is declared. If output
cards are set for nonrevertive switching, the HS card
remains the active output card until a higher level
failure occurs, or until an operator initiates a switch.
1:N Manual Protection Switching
4.30 A manual 1:N switch can be initiated by pressing
the appropriate push buttons on the DCD front panel,
by issuing a TL1 command to an MCA-5M card, or by inserting a pin in cards equipped with disabling jacks. The
HS card remains the active output card until an operator initiates a switch.
4.31 The front panel of many output cards contains
disabling jacks to disable each of its ports. If a disabling pin is inserted into one of the disabling jacks,
the port is disabled and a port alarm is registered.
The port alarm initiates a protection switch.
H. Synchronous Clock Insertion
4.32 Synchronous clock insertion synchronizes an
incoming or outgoing data-carrying facility with the
DCD timing source. The data stream enters the DCD
System, becomes synchronized to DCD timing in the
SCIU or ESCIU card, and leaves the DCD System.
4.33 Since data is carried on these timing lines, the interface panel for connecting the data lines contains a bypass relay that closes if the card fails, allowing data to
pass through the system during an alarm condition.
Issue 13: Mar 00
I.
TMSL 097-45230-01
SSM
Table I. Invalid SSM Clock Input Card Combinations
4.34 The DCIM-EA, DCIM-T, EA10M, and TOTA-M
cards can receive, process, and generate Synchronization Status Message (SSM) messages. A Version 5.04
or higher MIS card is required to handle SSM messages inside the system.
4.35 To communicate with an MIS card, the
DCIM-EA, DCIM-T, and EA10M cards require a Version 5.04 or higher MIS card in the shelf.
4.36 If EA10M cards are in redundant-pair protection and processing SSM messages, both cards in the
pair must be the EA10M card type.
4.37 The MCA-5M card, which is required for 1:N
protection in a managed Version 5 shelf, can process
SSM messages. This card requires a Version 5.05.01
or higher MIS card.
4.38 An operator can assign an SSM quality level to
any clock input card or clock card via TL1 commands, whether that card can process SSM messages or not.
4.39 One SSM message set is specific to E1, and another set is specific to T1. A single shelf can support
E1 SSM messaging, or T1 SSM messaging, but not
both.
4.40 Table H lists valid SSM clock input card combinations; Table I lists invalid SSM clock input card
combinations.
Table H. Valid SSM Clock Input Card Combinations
Slot 1
Slot 2
DCIM-EA
DCIM-EA or no card
DCIM-EA or no card
DCIM-EA
DCIM-T
DCIM-T or no card
DCIM-T or no card
DCIM-T
MRC-EA
MRC-EA or no card
MRC-EA or no card
MRC-EA
MRC-T
MRC-T or no card
MRC-T or no card
MRC-T
Slot 1
Slot 2
MRC-EA
MRC-T
MRC-T
MRC-EA
Any DCIM card
Any MRC card
Any MRC card
Any DCIM card
Any non-Version 5 clock
input card
Any non-Version 5 clock
input card
Any DCIM card
CI, ACI, or CI-EA card
CI, ACI, or CI-EA card
Any DCIM card
4.41 The following are valid card types for T1 SSM
operation:
• DCIM-T
• TOTA-M
• MRC-T, CI, or ACI (if installed according to Tables H and I)
4.42 The following cards are valid card types for T1
E1 SSM operation:
• DCIM-EA
• EA10M
• MRC-EA, CI, ACI, or CI-EA (if installed according
to Tables H and I)
5. ALARM AND MAINTENANCE CARD
DESCRIPTIONS
A. SAI Card
5.01 The SAI card provides DCD alarm summary
with office and remote telemetry alarm relay closures
and status indicators, and may be used in place of the
MIS card if remote RS-232 communication to the shelf
is not required.
Note: The DCIM cards can process SSM messages. Other clock input cards must be assigned a
quality level by TL1 command.
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TMSL 097-45230-01
5.02 The SAI card may be used for both master
and expansion shelf configurations to provide major
and minor alarm reporting. (Power supply alarms
are not passed from the expansion to the master
shelf.) In systems configured with a non-standard
MIS card in the master shelf, either an SAI or MIS
card can be installed in an expansion shelf to report
alarms to the MIS card in the master shelf.
5.03 Output alarms from the TO cards, input reference alarms from the clock input cards, and fail alarms
from any card in the shelf are sent to the SAI card on
the shelf alarm bus. Status indications, including clock
loss and port alarms, are also monitored by the SAI
card. Depending on which alarms are received, the SAI
activates audible and visual alarm and status indicator (SI) outputs. An additional set of status leads on
the backplane enables either a major or minor alarm
in the event of the failure of a battery or a blown fuse.
Issue 13: Mar 00
same shelf as an MISV5 card are listed in Table J. Cards
that cannot be used in the same shelf as a non-Version 5
MIS card are listed in Table K.
5.08 MISV5 card communications support both hardware flow control (via the CTS and RTS pins of the RS232 cable) and software flow control (via the XON/XOFF
protocol), and use commands compatible with X.25-based
PAD interfaces and the Hayes modem command set.
5.09 A database of information for the DCD System
can be downloaded from the remote communications device held in nonvolatile RAM, if the proper card switch
is selected. The previous copy of the database, if it exists,
remains in effect until cleared.
Table J. Cards Incompatible with MISV5
CARD
Note: Major and minor alarm leads have both
normally open (NO) and normally closed (NC)
dry relay contacts. Major and Minor Status Indicators have NO relay contacts only. All other status indicators are open-collector outputs
between the SI lead and battery return (SR). No
voltage potential exists on the SI leads, therefore they can be used to interface external systems with negative voltages such as –48 V dc
and –24 V dc.
MCA5
PART NUMBER
090-45015-01
(Rev. E or earlier)
GTI (Note 2)
090-42140-11
GTI (Note 2)
090-42140-12
GTI (Note 2)
090-42140-13
(Rev. D or earlier)
GTI (Note 2)
090-42140-14
(Rev. D or earlier)
5.04 When dc power is lost to the shelf, the normally open relays close, initiating an office alarm.
GTI (Note 2)
090-42140-15
(Rev. A)
5.05 A front-panel ACO push button, when pressed,
silences the audible alarm and lights the ACO lamp.
The ACO push buttons on all shelves in the system
have the same effect. An external lead on the shelf
backplane is provided for remote ACO operation.
MRC-EA
090-45010-06
MRC-EA
090-45010-07
MRC-T
090-45010-03
MRC-T
090-45010-08
B. MIS Card
PSM-E
090-45025-02
5.06 An MIS card installed in the master shelf provides office and remote telemetry surveillance and control for the DCD-523 System. The MIS provides DCD
alarm summary with office and remote telemetry alarm
relay closures and status indicators, as well as remote
RS-232 communication to the system via TL1. The MIS
card is installed in the far right side slot (MI) of the
DCD-523 master or expansion shelf.
PSM-T
090-45025-01
SAI
090-45014-02
5.07 Two versions of the MIS card are available, 09045018-04 and 090-45018-14 (non-Version 5 MIS) and
090-45018-05 (MISV5). Cards that cannot be used in the
Page 26
Notes:
1. Install an MISV5 card in any shelf that contains
a Version 5 card.
2. This card may not be installed in an LPR System that is used with a DCD-523 System that
has an MISV5 card in its master shelf.
Issue 13: Mar 00
TMSL 097-45230-01
Table K. Cards Incompatible with
Non-Version 5 MIS
CARD
PART NUMBER
GTI (Note 2)
090-42140-13
(Rev. E or later)
GTI (Note 2)
090-42140-14
(Rev. E or later)
GTI (Note 2)
090-42140-15
(Rev. B or later)
GTI (Note 2)
090-42140-16
MRC-EAV5
090-45010-56
MRC-EAV5
090-45010-57
MRC-TV5
090-45010-53
MRC-TV5
090-45010-58
MRC-TV5
090-45010-54
TO-EA5V5
090-45029-51
TO-EANV5
090-45029-56
TOTA-5V5
090-45012-52
PSM-EV5
090-45025-52
PSM-EAV5
090-45025-54
PSM-TV5
090-45025-51
or 090-45025-53
EA10V5
090-45029-52
EA10MV5
090-45029-54
Notes:
1. To conduct communications external to the
DCD System, an MIS must be installed in the
master shelf. An SAI card may be used in place
of an MIS card in expansion shelves.
2. This card may not be installed in a DCD-LPR
System that is used with a DCD-523 System
that has an MIS card in its master shelf.
5.10 An MISV5 card installed in a shelf allows TL1
commands to configure cards and retrieve data from individual Version 5 cards in the shelf. If a card in the shelf
is replaced with a card of the same type, the MISV5 card
sets the replacement card to the same configuration as
the replaced card. If an MISV5 card replacement does
not have a shelf database in nonvolatile memory, the re-
placement card populates its database with data from
the shelf. If a replacement card has a database, the replacement card configures the shelf according to its database.
5.11 An MISV5 card in the master shelf communicates with and configures the entire DCD System via
MISV5 cards in the expansion shelves. An MISV5
card must be installed in each expansion shelf that
contains a Version 5 card. Each MISV5 card in an expansion shelf configures the cards and retrieves the
data for its shelf, and exchanges information with
the MISV5 card in the master shelf.
5.12 The non-Version 5 MIS card allows TL1 commands to retrieve alarm information and certain
status from the system. A non-Version 5 MIS card
must be installed in the master shelf, and an SAI or
non-Version 5 MIS card must be installed in each expansion shelf in the system from which alarm information is desired.
5.13 The various commands used to communicate
with an MIS card are defined in the TL1 User’s
Guide (provided with each MIS card).
5.14 Output alarms from the TO cards, input reference alarms from the clock input cards, and fail
alarms from any card in the shelf are sent to the MIS
card on the shelf alarm bus. Status indications, including clock loss and port alarms, are also monitored by the MIS card.
5.15 The MIS card activates audible and visual
alarms, and status indicator (SI) outputs according
to the alarms received. An additional set of status
leads on the backplane enables either a major, minor,
or critical alarm in the event of a battery failure or a
blown fuse.
Note: Major, minor, and critical alarm leads
have both normally open (NO) and normally
closed (NC) dry relay contacts. Major, Minor,
and Critical Status Indicators have NO relay
contacts only. All other status indicators are
open-collector outputs between the SI lead and
battery return (SR) lead. No voltage potential
exists on the SI leads, therefore they can be used
to interface external systems with negative voltages such as –48 V dc and –24 V dc.
5.16 Alarm battery supply is not required for the
system. When dc power is lost to the shelf, the NO relays close, initiating an office alarm.
Page 27
TMSL 097-45230-01
5.17 A front-panel ACO push button, when pressed,
silences the audible alarm and lights the ACO lamp.
The ACO push buttons on all shelves in the system
have the same effect. An external lead on the shelf
backplane is provided for remote ACO operation.
5.18 The MIS card in the master shelf communicates
with an Operations Support System (OSS) for the entire
DCD-523 System. Version 5 cards in an expansion
shelf must communicate with an MISV5 located in the
same expansion shelf. The MIS card has three RS-232
ports (COM1, COM2, and COM3) and an 8-pin RJ45
connector (LOCAL COMM) on the faceplate.
Note: The COM2 and LOCAL COMM connectors carry the same information at the same settings from the same communications port on the
MIS card. One or the other may be active, but
not both simultaneously. On non-Version 5 MIS
cards, COM3 is an input port only. It does not
provide autonomous alarm reports; it only provides response messages to input commands
that are directed to that port.
5.19 The MIS reports alarms (via autonomous messages) to the OSS in real time, and writes both
alarms and events to a log. The log stores up to 256
messages (MISV5) or 64 messages (non-Version 5
MIS) and is accessed via TL1 language commands.
Alarms are categorized by software as major, minor,
and critical. Events are categorized as not alarmed
or not reported.
5.20 The status of the shelf is available at the front
panel lamps. A MAJOR, MINOR, or CRITICAL lamp
lights to indicate that one of those alarms exists on
the shelf. The FAIL lamp lights to indicate that the
MIS card has failed. The ACO lamp lights when the
ACO push button is pressed to silence an audible
alarm before the alarm is cleared.
5.21 The MIS card includes a security feature that
prevents unauthorized users from accessing TL1
commands. The security feature can be enabled and
disabled by using a switch on the MIS card. When
the switch is set to disable security, any user can access all TL1 commands; the user does not need a
password to log on to the system and access commands.
5.22 When the switch is set to enable security, users
must use a password to log on to the system and access commands. All TL1 commands are assigned an
Page 28
Issue 13: Mar 00
access level. When the security feature is enabled,
the command access levels are enabled. Each authorized user is also assigned an access level. The user’s
access level allows that user to access only those
commands that are at that level and below. Refer to
the TL1 User’s Guide (provided with each MIS card)
for more information about the MIS security feature.
SSM Processing
5.23 MIS cards with software version 5.04 or higher
have SSM processing capability. SSM operation is enabled by TL1 command via the MIS card. Refer to the
TL1 User’s Guide (provided with the MIS software) for
more information on enabling SSM operation.
5.24 The MIS card manages the DCIM card references
for SSM operation. Through TL1 command, the MIS
card provisions ports for SSM, sets the SSM interaction
hold-off threshold time, sets DCIM SSM port priority,
and enables pseudo SSM operation for non-Version 5
clock input cards, MRC cards, or digital or analog inputs
not supporting SSM. Refer to the TL1 User’s Guide for
more information on MIS SSM operation through TL1
commands.
6. CLOCK INPUT CARD DESCRIPTIONS
A. CI-EA Card
6.01 Each CI-EA card uses a single E1 or analog
(defined as G.703) input (2.048 Mb/s for E1 or 2.048
MHz for analog) as its timing reference. The reference signal connects to the CI-EA card via a reference input module on the interface panel. Option
switches on the card allow user-selection of the framing type of the input signal, and the input signal type
as either digital E1 or analog. The PLXO produces
an internal timing signal that is bused to the clock
reference cards and the TO cards in the DCD-523
System.
6.02 The CI-EA card contains a control circuit that
causes a switch to the redundant CI-EA if the active
card fails. Input signal outages, PLL unlocks, excessive code violations, or loss of sync cause the system
to switch CI-EA cards.
6.03 During normal operation with a rubidium
clock, each clock is locked to its respective CI-EA
card (A or B). If a CI-EA card fails or is degraded, the
source clock automatically switches to the other
Issue 13: Mar 00
CI-EA card which supplies both clocks until the
failed reference is restored. If both CI-EA cards fail,
the clocks will go into holdover mode.
6.04 During normal operation with a quartz clock,
the source to the active clock is derived from either
CI-EA card. In a normally operating, fully equipped
shelf, the CI-EA card that was installed first is the
source for the clock. If the source CI-EA card fails,
the quartz clock uses the signal from the other
CI-EA card. If both CI-EA cards fail, the clocks will
go into holdover mode.
TMSL 097-45230-01
Note: Both CI cards are active if the system is
configured with redundant ST2E, ST2, or
TNC-E cards (operating in ST2 mode). Only one
CI card is active in systems with ST3E, TNC, or
LNC cards. This is determined by the ST2/ST3
switch on the backplane.
6.10 The CI card contains a source control circuit
that causes the card to switch to the redundant CI
card if the primary card (defined as the card currently in operation) fails.
6.05 On quartz clock systems, transfer between
CI-EA cards can be manually initiated by pressing
the front-panel XFR switch on either CI-EA card.
6.11 On quartz clock systems, transfer between CI
cards can be manually initiated by pressing the
front-panel XFR switch on either CI card. The switch
function is also available for remote control.
6.06 On rubidium clock systems, clock A is locked to
clock input A and clock B is locked to clock input B,
therefore, switching between clock input cards is not
possible. The ST2/ST3 switch on the backplane determines whether the CI-EA cards operate in the rubidium clock mode or the quartz clock mode.
6.12 On rubidium clock systems, clock A is locked to
clock input A and clock B is locked to clock input B,
therefore, switching between clock input cards is not
possible. The ST2/ST3 switch on the backplane determines whether the CI cards operate in the rubidium
clock mode or the quartz clock mode.
B. CI Card
6.13 If both CI cards fail, the clock cards go into
holdover mode, and the system automatically uses
the active clock card.
6.07 Two CI cards provide input signal redundancy.
Each CI card uses one CC or one DS1 input as its
timing reference. A switch on the CI card selects the
type of input and the framing format (if DS1) of the
input timing signal. Front panel lamps (CC and
DS1) show which type of input is present.
Note: The CC input from an existing office
clock is used for Stratum-3 applications only;
ST2E, TNC-E, ST2, ST3E, TNC, or LNC clock
cards must not be fed with CC input.
6.08 The DS1 input can be either a terminated
signal or a low-level (bridged) signal via the builtin bridging amplifier. Refer to the Installation section of this manual for recommended bridging connections.
6.09 Under normal operating conditions, CI A
drives clock card A, and CI B drives clock card B.
Both input reference signals are simultaneously
monitored, and if an input fails, the clock card automatically switches to the other CI card, which then
supplies both clock cards until the failed reference is
restored. The SOURCE ACTIVE lamp on the front
panel indicates which CI card is active.
C. ACI Card
6.14 The ACI card performs the same functions as
the CI card, except its input reference signal is analog instead of digital. The ACI card accepts analog
inputs of 1 MHz, 2 MHz, 5 MHz, or 10 MHz. A frequency control circuit reads the frequency-select
switches, lights the appropriate front-panel lamp
(1 MHz, 2 MHz, 5 MHz, or 10 MHz), and sends a frequency-control signal to the clock recovery circuit.
6.15 If input signal problems continue, the ACI initiates a transfer to the other ACI card. The SRC ACT
lamp lights on the active card (the one supplying
timing). If the other card also cannot supply timing,
the clocks go into holdover.
6.16 On quartz clock systems, transfer between
ACI cards can be manually initiated by pressing the
front-panel XFR switch on either ACI card.
6.17 On rubidium clock systems, clock A is locked to
clock input A and clock B is locked to clock input B,
therefore, switching between clock input cards is not
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possible. The ST2/ST3 switch on the backplane determines whether the ACI cards operate in the rubidium
clock mode or the quartz clock mode.
Issue 13: Mar 00
Each input is sampled every second. Spans that are
not enabled are not checked. Scanning continues to
cycle through the active inputs while the card is powered.
D. DCIM Cards
6.18 The DCIM cards include the DCIM-EA and
DCIM-T cards. Each DCIM card has connections for two
external reference source inputs.
6.28 The DCIM reports an event when the transmission event count exceeds the assigned threshold.
The factory-set thresholds are as follows:
• Alarm indication signal (AIS): 1
6.19 A VCXO produces an internal timing signal
which is locked to the active input reference. The 4 kHz
reference is derived from the VCXO, which is bused to
the clock and TO cards in the DCD-523 System.
6.20 DCIM-EA cards accept either 2.048 Mb/s E1 or
2.048 MHz analog signals; DCIM-T cards accept 1.544
Mb/s DS1 signals. The inputs can be either with or without SSM.
6.21 A switch on the DCIM card selects the type of input and the framing format of the input timing signal on
a per port basis.
6.22 The user can program the framing format, using
the MIS interface and TL1 commands. Refer to the TL1
User’s Guide for information regarding these commands.
6.23 Each input can be either a terminated signal
or a low-level (bridged) signal via the built-in
bridging amplifier. Refer to the Installation section of this manual for recommended bridging connections.
6.24 The FAIL lamp on the DCIM card lights red to indicate that the card failed.
6.25 There is a separate front-panel REF lamp for each
reference source, and each lamp indicates the status of
the corresponding reference input. The REF lamps light
green when an input is enabled and has passed error
check. The REF lamps light red when an input is enabled and fails the error check (high CRC, OOF, BPV,
AIS, or LOS). The REF lamps do not light if the associated input is not enabled.
6.26 There is a separate front-panel STAT lamp associated with each input reference. Green indicates the input is providing a reference signal to the VCXO.
Performance Monitoring of Digital Parameters
6.27 The DCIM card scans each enabled input to
monitor transmission and performance parameters.
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• Bipolar violations (BPV): 16
• Cyclic Redundancy Check (CRC): 16
• Loss of signal (LOS): 1
• Out of frame (OOF): 1
6.29 The OOF and AIS counts represent the number of errored seconds for each event during the time
the DCIM scans the input. The BPV and CRC counts
represent the actual number of errors counted while
the input is being scanned. All thresholds except
LOS are user-configurable, and the report given
when a threshold is exceeded can be changed from a
condition to an alarm.
6.30 The monitored parameters and calculated values are stored in ninety-six 15 minute bins. The bins
are first-in, first-out (FIFO) so that when the 97th
interval is completed, the oldest stored 15 minute
data is overwritten. The data in these bins is the 1
minute averaged raw phase values. Therefore, a 15
minute bin will contain 15 data points.
6.31 Performance data is collected only for inputs
that have been enabled by card switches or TL1 command. If the DCIM card is removed from the shelf,
all error counts and stability measurement data registers are set to zero.
Non-SSM Operation
1 + 1 Mode
6.32 In this mode, the two DCIM cards function as
a single card with four inputs. Only one of the four
inputs is used to provide a reference for the shelf.
Therefore, only one DCIM card is active at a time.
6.33 Priorities can be assigned to the four inputs in
any order, or all inputs can be assigned the same priority, or any combination thereof (1 is the highest
priority).
Issue 13: Mar 00
6.34 If the same priority is assigned to multiple inputs (where no other inputs have a higher priority),
the first signal to be qualified is used. If this signal
fails, another input with the same priority is used. If
the disqualified signal is requalified, the system
does not switch back to the requalified signal because the requalified signal has the same priority.
This is the nonrevertive feature.
TMSL 097-45230-01
6.42 The following can be achieved through TL1
commands (refer to the TL1 User’s Guide for information regarding these commands):
• Provision ports for digital operation with a specific framing option
• Provision ports supporting and not supporting
SSM
6.35 If different priorities are assigned to the inputs, the highest priority signal is used. If the highest priority signal fails, the next-highest priority
signal is used. If the disqualified signal is requalified, the system reverts to the requalified signal.
This is the revertive feature.
• Set the wait-to-restore delay
• Set the SSM interaction hold-off threshold time
• Set the SSM port priority when more than one
port is active
Stand-alone Mode
• Retrieve the current SSM message on particular
ports on a specific DCIM card
6.36 In this mode, each DCIM card operates as a
single card with two inputs. Each card uses the input
with the highest priority. If the ST2/ST3 switch is in
the ST2 position, each DCIM card supplies a reference signal to the corresponding clock card.
• Switch active port status on a port with a lowerquality value, and also release the forced condition
• Enable pseudo SSM operation and assign quality levels to non-Version 5 clock input cards, MRC
cards, or digital or analog inputs not supporting
SSM
6.37 If one of the DCIM cards fails or both of the inputs on a card are disqualified, the remaining DCIM
card provides a reference to both clock cards.
6.38 If the ST2/ST3 switch is in the ST3 position,
one of the DCIM cards is used (active) at a time with
that DCIM card supplying both clock cards. The active card can be changed by pressing the XFR push
button switch on either DCIM card front panel.
6.39 The inputs can operate in revertive or nonrevertive mode, depending on priorities assigned.
SSM Operation
6.40 If two DCIM cards are installed, up to four inputs are available. However, only one DCIM card is
active at a time. The input with the highest SSM
quality level signal is always used. If multiple signals have the same highest SSM quality level, the
input with the highest priority is used.
6.41 If multiple inputs have the same highest SSM
quality level, and the same priority, and if the active
signal is disqualified or reduces its SSM quality level, another signal with the same highest quality level is used. If the signal is requalified, or returns to its
original quality level, the system does not switch
back to the requalified signal (nonrevertive).
E.
MRC Cards
6.43 The MRC cards include the MRC-EA, MRC-T,
MRC-EAV5, and MRC-TV5 cards. Each MRC card has
connections for four external reference source inputs,
and contains two internal uncorrected reference
sources to use as a timing reference source. The MRCEA cards can be switch-selectable to accept either
2.048 Mb/s E1 or 2.048 MHz analog signals; the
MRC-T cards accept 1.544 Mb/s DS1 signals. Framing on MRC-T inputs can be set manually or to automatically detect the framing type.
6.44 An MRC card communicates with the MIS
card to configure the input port priority, and report
status and alarm information to the MIS card.
6.45 An MRCV5 card works with an MISV5 card to
configure input port priority, report status and alarm
information, and enable and disable status and alarm
reporting to the MISV5 card. Additional status and
alarm information is provided with the MRCV5 card.
This card provides status of the 4 kHz reference clock
and an MIS communication loss alarm.
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6.46 In the automatic framing mode, the MRC-T
card automatically recognizes the incoming D4 or
ESF framing and automatically locks to the incoming
framing if it is either of these formats.
6.47 If the incoming framing pattern changes, the
MRC-T card automatically recognizes the new framing format. During this framing period, the MRC-T
card declares excessive OOF errors on the input until the MRC-T card can lock to the framing format, at
which time it will declare the input good by lighting
the front-panel REF lamp green for that input.
6.48 The user may program the framing format, using the MIS interface and TL1 commands. Refer to
the TL1 User’s Guide for information regarding
these commands.
6.49 Through internal connections, the MRC card
also uses the free-running oscillator in the clock
cards (TNC-E, ST2E, and ST2) as references in the
majority vote. In total, the MRC card continuously
measures and utilizes six signals (four external plus
two internal).
6.50 Under normal operating conditions, each MRC
card simultaneously acts as a time scale generator
and reference monitor. With at least three usable references available (and at least two are independent),
the MRC card performs a majority vote, and determines whether a reference is acceptable.
6.51 References considered “usable” (for majority
vote) are those inputs (external and internal) whose
REF lamp is lit green. References considered independent for majority vote are network, cesium, or
backfed rubidium signals from the ST2E, ST2, or
TNC-E oscillator.
6.52 Majority vote begins with the MRC card continuously scanning all of its active internal (backfed
ST signals) and external references. While scanning
the references, the MRC card gathers raw phase
data and calculates the average frequency for each
active reference. A matrix of usable references, versus all references, is created and a pair-wise comparison is made between all valid combinations of
inputs. From this matrix, an average frequency difference is calculated for each pair. This difference is
used to disqualify individual references. Each input
has been given a threshold value based on its input
type. These values are: GPS, LORAN-C, cesium at 5
x 10–10, rubidium at 2x 10–9, and network at 1 x 10–8.
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Issue 13: Mar 00
6.53 In the process of calculating the frequency difference for each pair, the threshold for disqualification is the sum of the individual input thresholds.
For example, when comparing rubidium to cesium,
the threshold for the pair is 5 x 10–10 + 2 x 10–9 =
2.5 x 10–9. If a system is equipped with MRC and
ST2E/TNC-E cards, and has multiple network feeds
into each MRC card, the MRC card will disqualify a
network feed if the frequency offset is greater than
allowed. Each pass of the majority vote algorithm
takes approximately 30 seconds. It takes up to approximately 60 seconds to confirm that the input is
out of tolerance.
6.54 If the conditions for majority vote are not met
(e.g., insufficient inputs), and there is still a “usable”
external reference available, the MRC card will revert to “CI” mode. In this mode, the MRC card locks
to the highest priority input that is declared good,
and operates similar to the CI card (for information
regarding CI card operation, refer to Part 5B, CI
Card). However, under this condition, the MRC card
does not perform majority vote. If a reference fails
due to excessive errors, LOS, etc., while in this mode,
the MRC card will automatically switch to the next
available highest priority input. The output signal is
maintained, regardless of its “quality.”
6.55 If all external references have been voted out,
the MRC card will also revert to “CI” mode and continue to use the highest priority input. The MRC
card will continue to monitor the inputs to requalify
those that begin meeting the frequency offset
thresholds.
6.56 Two sets of switches are available on the MRC
card to set the following parameters:
• Whether the references (1 through 4) are disabled or enabled
• The input type and priority level. Setting the reference type also determines the input priority. References are treated with the following priority:
a. GPS (priority level 1)
b. LORAN (priority level 2)
c.
Cesium (priority level 3)
d. Network (priority level 4)
Issue 13: Mar 00
Note: Priorities should not be set by setting
“incorrect” input types, that is, for Network to
be priority 1, it cannot be identified as GPS; attempting to redefine input priority by changing
its type, via card switches, will cause a malfunction of the MRC card. However, this priority scheme may be changed via TL1 commands
issued through the MIS card.
6.57 If the same reference type is designated for
more than one input, the input number decides the
priority level. For example, if inputs 2 and 3 are both
designated GPS, input 2 would have higher priority.
This priority scheme may be changed via TL1 commands issued through the MIS card.
6.58 When the MRC card is power cycled, it will revert to its switch settings unless an MIS card is
present in the shelf. The MIS card stores all option
data for the MRC card. If an MRC card is replaced or
power cycled with an MIS card present in the shelf,
the MIS card will download the previously stored
MRC card options for that slot. To configure the
MRC card to revert to the switch settings, instead of
to previously stored options, remove the MIS card
from the shelf before inserting the MRC card. Once
the MRC card test has been completed, reseat the
MIS card. This will cause the MRC card to upload its
switch settings as the current configuration.
6.59 The MRC card performs hitless switching between inputs if the clock cards are present and the
signal is good. If the active input to an MRC card fails,
it will automatically switch to the next highest priority input that is declared good. When the failed input
is declared good, the MRC card will automatically
switch back to it to keep the input priorities in order.
6.60 The FAIL lamp on the MRC card lights red to
indicate that the MRC power supply has failed, or
diagnostic self-tests have failed.
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lamp indicates that the MRC card has disqualified
its last “usable” reference due to majority vote, but is
continuing to use that reference for its output.
6.63 If due to excessive errors or LOS, all four inputs
fail to the active MRC card, an automatic switch occurs to the other MRC card, which then supplies both
clock cards with a clock signal until the failed reference(s) is restored. The SRC ACTIVE lamp on the
front panel indicates which MRC card is active.
Note: Both MRC cards are active if the system
is configured with at least one ST2E, ST2, or
TNC-E card. Only one MRC card is active in systems with ST3E, TNC, or LNC cards (MRC card
may not be used with ST3 clock cards). The different modes are determined by the ST2/ST3
switch on the backplane. When the shelf is
equipped with 090-45010-08, -54, and -57 MRC
cards, the ST2/ST3 switch must be in the ST2
position.
6.64 The MRC card performs a sampled error check
on all provisioned inputs to monitor error parameters
for: LOS, OOF, CRC, AIS, and BPV. Once completed,
error checking on the next enabled span begins. This
procedure is repeated until all references to the MRC
card are monitored, and then starts over on the first
input.
6.65 If high error counts exceeding thresholds are
found, the reference is declared unacceptable, and
the MRC card switches to the next highest priority
input that is acceptable.
6.66 Each MRC card is shipped with factory-set
thresholds for each digital error parameter; the factory settings are:
• Out of frame (OOF): 4
• Alarm indication signal (AIS): 4
6.61 Front panel REF input lamps indicate reference input stability; green indicates the input is enabled and good, red indicates input has failed due to
LOS or excessive error counts, and no lamp indicates
the input has not been enabled.
• Bipolar violations (BPV): 16
• Cyclic redundancy check (CRC): 16
• Loss of signal (LOS): 1
6.62 Front panel STATUS input lamps indicate the
reference stability state; green indicates the input
has been selected as the reference, yellow indicates
input is over stability threshold, and no lamp indicates the input is within stability threshold for its
reference type. A flashing green and yellow STATUS
6.67 OOF and AIS counts represent the number of
errored seconds for each event while scanning the inputs. BPV and CRC counts represent the actual number of errors counted for each event while scanning the
inputs. LOS is an actual count of loss-of-signal events.
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TMSL 097-45230-01
An event is defined as a transition from signal to LOS.
All thresholds, except for LOS, may be user-configured
to meet specific network requirements via the MIS
card and TL1 commands.
6.68 If both MRC cards fail, the clock cards go into
holdover mode, and the system automatically uses
the active clock to provide timing to the output cards.
6.69 If the ST2/ST3 switch on the backplane is in
the ST3 position, transfer between MRC cards can
be manually initiated by pressing the front-panel
XFR switch on either MRC card.
6.70 If the ST2/ST3 switch on the backplane is in
the ST2 position, the XFR switch does not function.
Note: Each MRC card takes approximately
45 minutes after power-up to complete oscillator
characterization. During this warm-up period, it
is possible to receive errant fractional frequency
disqualification messages for either the clock
card or external inputs, or both. All other MRC
card functions operate normally. After the
45 minute warm-up period, the MRC card begins normal operation. If fractional frequency
disqualification messages are then listed, the
MRC cards respond as appropriate.
If a clock card is reseated or installed for the
first time after the MRC card has completed
the warm-up period, the MRC card resets its
45 minute counter for the oscillator in question.
7. CLOCK CARD DESCRIPTIONS
A. ST2E Card
7.01 The ST2E clock card provides a stable reference to drive the TO cards. The essential element of
the ST2E card is a rubidium atomic oscillator with a
24 hour holdover stability that exceeds most required specifications. The oscillator is calibrated
over a wide temperature range to provide additional
stability during ambient temperature variations.
7.02 ST2E cards are normally configured to function as a pair. The ST2E A card receives its reference
from clock input A, and the ST2E B card receives its
reference from clock input B.
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Issue 13: Mar 00
7.03 During normal operation, each ST2E card is
locked to its respective clock input card (A or B). A
reference signal generated by the clock input cards is
passed to the clock cards via the backplane bus. The
clock then samples and averages the reference input
and updates a control register. During this process,
the values are adjusted for the current temperature.
Network wander filtering is achieved by this process,
in combination with microprocessor filtering.
7.04 Each ST2E card monitors the frequency of the
other ST2E card’s output signal and compares it to
the clock input card signals. If an out-of-range level
is detected, the ST2E card identifies whether the reference is drifting with respect to the ST2E clock.
Note: The ST2E card remains active and tracks
the respective input. If a problem is detected on
the output, the SRC A or SRC B lamp, depending on which card has the problem, will function
as follows:
• If the ST2E card is tracking the output of the
clock input card, the lamp lights green.
• If the reference from the clock input card is disqualified (clock signal is out of tolerance), the
lamp lights red.
• If the reference from the clock input card is missing, the lamp goes off.
• If the reference from the clock input card is drifting (drift exceeds 1x10-9 within 5 minutes), the
lamp flashes green.
7.05 The ST2E card provides extensive fault tolerance and diagnostic utilities provided by the rubidium control system working with the DCD Shelf. The
ST2E card also has the capability to inter-work with
Symmetricom’s DCD-LPR System to provide PRS
performance.
7.06 The TR-1244 control loop ensures that all rearrangement activity of the clock input cards or the ST2E
cards is performed without hits on the internal reference bus. If an input reference signal fails to meet ST2E
card input tolerance requirements, the secondary source
will be selected. This action will not result in a phase
movement at the output. Finally, if all available reference signal inputs are not within the pull-in range, the
ST2E card enters its holdover state.
Issue 13: Mar 00
Note: TR-1244 is a Telcordia standard defining
DCD clock filtering and performance requirements for high performance networks such as
SONET or SDH.
7.07 When the ST2E card enters holdover, the 24
previous 1 hour averages are retrieved from a data
history file. Any single 1 hour average that is out of
tolerance is discarded and the remaining are averaged with the current temperature value to establish a holdover value for the synthesizer.
7.08 The output of the ST2E card is controlled by a
frequency synthesizer. Any frequency difference between the ST2E card and the reference generates a
change in the synthesizer frequency that moves the
output toward a frequency difference of zero. If all
reference outputs are precisely matched, no correction is given to the synthesizer.
Note: None of the frequency and phase comparisons are made with only one ST2E card installed.
7.09 The OSC lamp flashes green if the card requires factory maintenance (flashes for approximately 2 weeks—after which, the card fails and the
output is disabled). The OSC lamp lights red if the
oscillator has failed (disables the ST2E card output).
To avoid the failure mode, replace the card when the
OSC lamp flashes green. Normal mode is indicated
when the OSC lamp is off.
7.10 All status lamps on the ST2E card front panel
are duplicated as ALARM status leads on the shelf
backplane. A switch option on the shelf backplane is
provided to enable either major or minor alarm status when both ST2E card clocks are in holdover
mode.
7.11 With both input cards installed, each ST2E
card indicates an active status. In addition, each
ST2E card indicates that it is using one of the two
possible inputs by lighting the respective SRC A or
SRC B lamp. The output cards select the ST2E card
in the ST A slot as the preferred clock. The ST2E
card in the ST B slot becomes the preferred clock
only if one of the following conditions occur:
a. The ST2E card in the ST A slot fails.
TMSL 097-45230-01
c.
The DSBL push button switch on the ST2E
card faceplate in the ST A slot is pressed (this
switch is hidden by the CAUTION label, and
may be pressed only if the card is going to be
removed—once the switch is pressed, the output is disabled for up to 20 minutes).
Note: The DSBL push button on the ST2E
card installed in the ST B slot does not function
(the card in the ST B slot cannot be disabled).
7.12 The outputs from both ST2E cards and both
clock input cards are available to the timing output
cards for selection based on preset priorities (refer to
Table G for priorities).
B. ST2 Card
7.13 The ST2 clock card provides a stable reference
to drive the TO cards. ST2 cards are normally configured to function as a pair. ST2 A receives its reference from clock input A and ST2 B receives its
reference from clock input B.
7.14 During normal operation, each ST2 card is
locked to its respective clock input card (A or B). A
4 kHz reference signal generated by the clock input
cards is sampled for 5 minutes and averaged. At the
end of the 5 minute period, a new averaged value is
given to the synthesizer. This 5 minute value is combined with the 12 previous 5 minute samples and adjusted for the current temperature. Network wander
filtering is achieved by this process, in combination
with microprocessor filtering.
7.15 The output of the ST2 card is controlled by a
17-bit frequency synthesizer. Any frequency difference between the ST2 card and the reference generates a change in the synthesizer frequency that
moves the output towards a frequency difference of
zero. If all reference outputs are precisely 4 kHz, no
correction is given to the synthesizer.
7.16 The key to the performance of the ST2 card is a
compact rubidium atomic oscillator physics package.
The rubidium oscillator is temperature compensated
to ensure a stable output. The frequency synthesizer
that regulates the output signal is matched to the oscillator performance to guarantee there is sufficient
dynamic range to accommodate temperature and aging variations over the expected life of the ST2 card.
b. The ST2E card in the ST A slot is removed.
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7.17 Each ST2 card monitors the frequency of the
other ST2 card’s 4 kHz signal and compares it to the
clock input signals. If an out-of-range level is detected, the ST2 cards initiate an “inputs unlocked” status. This merely means that the respective input
signals to each ST2 card have drifted apart from one
another. This is not a service-affecting phenomenon.
Note, however, the ST2 card remains active and
tracks the respective input.
7.18 If problems are detected in the ST2 card, the
ST2 card initiates a transfer to remove the bad card
from the DCD System. All transfers, clock input and
ST2 cards, are performed without hits on the internal 4 kHz reference bus by transferring the phase information to the backup card. If an input reference
signal fails to meet ST2 card input tolerance requirements, the secondary source is selected. This action
will result in a phase movement at the output, according to ANSI and Telcordia specifications. Finally, if all available reference signal inputs are not
within the Stratum-2 pull-in range, the ST2 card enters into holdover.
7.19 When the ST2 card enters holdover, the 36 previous 1 hour averages are retrieved from a history
file in RAM. The most recent 12 are discarded and
the remaining 24 are averaged with the current temperature value to establish a holdover center frequency value for the synthesizer.
7.20 If, for any reason, the processor detects that
maintenance is required on the ST2 card, the REF
lamp flashes (depending upon which reference the
ST2 card is locked to, REF A or REF B). A minor
alarm is issued. The alarm may be retired by pressing the XFR front-panel push button. The REF lamp
continues to flash, indicating that maintenance is required.
Issue 13: Mar 00
7.23 All status lamps on the ST2 card front panel
are duplicated as ALARM status leads on the shelf
backplane. A switch option on the shelf backplane is
provided to enable either major or minor alarm status when both ST2 card clocks are in holdover mode.
C. ST3E Card
7.24 The ST3E clock card provides a stable reference to drive the TO cards. During normal operation,
the input to the ST3E card is derived from clock input card A or clock input card B. In a normally operating, fully equipped shelf, the ST3E card uses the
signal from the clock input card that was installed
first. If the card in the MR A slot fails or is not
equipped, the ST3E card uses the signal from the
card in the MR B slot. The input reference (REF)
may be manually switched by pressing the transfer
(XFR) push button on either clock input card.
7.25 The output stays locked to the reference input
as long as the following conditions exist:
• Input reference signal is within the pull-in
range.
• The maximum frequency step of the input reference signal is less than the input tolerance.
• The rate of change (slope) of the input reference
is less than the input tolerance.
7.26 The internal synthesizer contains a frequency adjustment range to accommodate temperature and aging
variations over the service lifetime of the card. Changes
to the synthesizer are in frequency steps, which allows
the synthesizer to act as an “electronic flywheel” and
buffer the phase and frequency changes of the input.
7.21 While the maintenance (REF) lamp is flashing, the ST2 card clock continues to operate normally. However, after 180 days or more, the ST2 card
may go into failure mode, in which case it is taken off
line, the FAIL lamp lights, and a major alarm is generated. The active status transfers to the other clock
in the system.
7.27 If the input reference signals are either unavailable or out of range, the ST3E card will change
state and enter a holdover mode. The last 24 hours
of input frequency samples are stored, averaged, and
continuously updated. The synthesizer uses this value, which is known to be good, as the clock center frequency. When the input signals are restored and lock
is achieved, the ST3E card exits holdover mode.
7.22 None of the frequency and phase comparisons
or transfers are made with only one ST2 card. The
“inputs unlocked” lamp is inoperative. The transfer
switch, in this case, transfers the clock input reference rather than the active ST2 card when operating
as a pair.
7.28 Fault tolerance is achieved in the DCD Shelf
by using redundant clock input signals (via paired
clock input cards) and redundant ST3E cards. If one
of the clock input cards or reference signals fails, the
ST3E card automatically switches to the signal from
the other clock input card.
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TMSL 097-45230-01
7.29 The outputs from both ST3E cards, and both
clock input cards, are available to the TO cards for
selection based on preset priorities (refer to Table G
for priorities).
7.36 TNC-E cards are normally configured to function as a pair. The TNC-E A card receives its reference from clock input A, and the TNC-E B card
receives its reference from clock input B.
D. ST3 Card
7.37 During normal operation, each TNC-E card is
locked to its respective clock input card (A or B). A
reference signal generated by the clock input cards is
passed to the clock cards via the backplane bus. The
clock then samples and averages the reference input
and updates a control register. During this process,
the values are adjusted for the current temperature.
Network wander filtering is achieved by this process,
in combination with microprocessor filtering.
7.30 The ST3 clock card provides timing signals at
Stratum-3 accuracy to the main bus to drive the TO
cards. Select logic on each TO card automatically
chooses the input timing signal of the highest priority (refer to Table G). Since the ST3 is the only clock
card capable of accepting and tracking a composite
clock (CC) input signal, it is primarily deployed in remote shelf systems within an office; it may be configured alone or in pairs.
7.31 The ST3 card is based on phase-locked loop
(PLL) filtering and VCXO technology. The ST3 card
is a relatively wide bandwidth fast-tracking clock
that provides the necessary jitter attenuations and
holdover stability. The PLL output is compared to a
temperature-compensated oscillator (TCXO) and an
offset is generated to phase-lock to the clock input (A
or B).
7.32 If an input source is unavailable or has failed,
the circuit goes into clock holdover mode at the frequency of the last valid input. The ST3 then provides
clocking to the TO cards for a minimum of 24 hours.
If the DCD-523 System is started without an input
reference, the ST3 maintains accuracy at a predetermined rate.
7.33 The output timing signal is placed on a common bus for use by all TO cards in the system. If both
ST3 cards fail, a major system alarm is issued and
the TO cards use the output of the clock input cards.
7.34 A phase buildout circuit between the two
clock input (A and B) cards and each ST3 clock prevents transients from being transmitted to the TO
cards when there is a transfer between the two ST3
cards.
E.
TNC-E Card
7.35 The TNC-E clock card provides a stable reference to drive the TO cards. The essential element of
the TNC-E card is a rubidium atomic oscillator with
a 24 hour holdover stability that exceeds most required specifications. The oscillator is calibrated
over a wide temperature range to provide additional
stability during ambient temperature variations.
7.38 Each TNC-E card monitors the frequency of
the other TNC-E card’s output signal and compares
it to the clock input card signals. If an out-of-range
level is detected, the TNC-E card identifies whether
the reference is drifting with respect to the TNC-E
clock.
Note: The TNC-E card remains active and
tracks the respective input. If a problem is detected on the output, the SRC A or SRC B lamp,
depending on which card has the problem, will
function as follows:
• If the TNC-E card is tracking the output of the
clock input card, the lamp lights green.
• If the reference from the clock input card is disqualified (clock signal is out of tolerance), the
lamp lights red.
• If the reference from the clock input card is missing, the lamp goes off.
• If the reference from the clock input card is drifting (drift exceeds 1 x 10–9 within 5 minutes), the
lamp flashes green.
7.39 The TNC-E card provides extensive fault tolerance and diagnostic utilities provided by the rubidium control system working with the DCD Shelf. The
TNC-E also has the capability to inter-work with
Symmetricom’s DCD-LPR System, to provide PRS
performance.
7.40 The TR-1244 control loop ensures that all rearrangement activity of the clock input cards or the
TNC-E cards is performed without hits on the internal reference bus. If an input reference signal fails to
meet TNC-E card input tolerance requirements, the
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TMSL 097-45230-01
Issue 13: Mar 00
a. The TNC-E card in the ST A slot fails.
secondary source will be selected. This action will
not result in a phase movement at the output. Finally, if all available reference signal inputs are not
within the pull-in range, the TNC-E card enters its
holdover state.
b. The TNC-E card in the ST A slot is removed.
c.
Note: TR-1244 is a Telcordia standard defining
DCD clock filtering and performance requirements for high performance networks such as
SONET or SDH.
7.41 When the TNC-E card enters holdover, the 24
previous 1 hour averages are retrieved from a data
history file. Any single 1 hour average that is out of
tolerance is discarded and the remaining are averaged with the current temperature value to establish a holdover value for the synthesizer.
7.42 The output of the TNC-E card is controlled by
a frequency synthesizer. Any frequency difference
between the TNC-E card and the reference generates a change in the synthesizer frequency that
moves the output toward a frequency difference of
zero. If all reference outputs are precisely matched,
no correction is given to the synthesizer.
Note: None of the frequency and phase comparisons are made with only one TNC-E card installed.
7.43 The OSC lamp flashes green if the card requires factory maintenance (flashes for approximately 2 weeks—after which, the card fails and the
output is disabled). The OSC lamp lights red if the
oscillator has failed (disables the TNC-E output). To
avoid the failure mode, replace the card when the
OSC lamp flashes green. Normal mode is indicated
when the OSC lamp is off.
7.44 All status lamps on the TNC-E card front panel are duplicated as ALARM status leads on the shelf
backplane. A switch option on the shelf backplane is
provided to enable either major or minor alarm status when both TNC-E card clocks are in holdover
mode.
7.45 With both input cards installed, each TNC-E
card indicates an active status. In addition, each
TNC-E card indicates that it is using one of the two
possible inputs by lighting the respective SRC A or
SRC B lamp. The output cards select the TNC-E card
in the ST A slot as the preferred clock. The TNC-E
card in the ST B slot becomes the preferred clock
only if one of the following conditions occur:
Page 38
The DSBL push button switch on the TNC-E
card faceplate in the ST A slot is pressed (this
switch is hidden by the CAUTION label, and
may be pressed only if the card is going to be
removed—once the switch is pressed, the output is disabled for up to 20 minutes).
Note: The DSBL push button on the TNC-E
card installed in the ST B slot does not function
(the card in the ST B slot cannot be disabled).
7.46 The outputs from both TNC-E cards and both
clock input cards are available to the timing output
cards for selection based on preset priorities (refer to
Table G for priorities).
F.
TNC Card
7.47 The TNC card provides a stable reference to
drive the TO cards. TNC cards are normally configured to function as a pair.
7.48 During normal operation, both TNC cards are
locked to one clock input card (A or B). A reference
signal generated by the clock input card is passed to
the clock cards via the backplane bus. The clock then
samples and averages the reference input and updates a control register. Network wander filtering is
achieved by this process, in combination with microprocessor filtering.
7.49 The output of the TNC card is controlled by a
numerically controlled oscillator (NCO). Any frequency difference between the TNC card and the reference generates a change in the oscillator frequency
that moves the output toward a frequency difference
of zero. If all reference outputs are precisely
matched, no correction is given to the NCO.
7.50 If problems are detected in the TNC card, the
TNC card initiates a transfer to remove the bad card
from the DCD System. All transfers, clock input and
TNC cards, are performed without hits on the internal reference bus by transferring the phase information to the backup card. If an input reference signal
fails to meet TNC card input tolerance requirements, the secondary source will be selected. This action results in a phase movement within standards
Issue 13: Mar 00
at the output. Finally, if all available reference signal
inputs are not within the TNC card pull-in range,
the TNC card enters holdover mode.
7.51 When the TNC card enters holdover mode, the
24 previous 1 hour averages are retrieved from a
data history file. Any single 1 hour average that is
out of tolerance is discarded and the remaining are
averaged with the current temperature value to establish a holdover value for the synthesizer.
7.52 If, for any reason, the processor detects that maintenance is required on the TNC card, the REF lamp
flashes (depending upon which reference the TNC card
is locked to—REF A or REF B). To avoid a card failure,
replace the card when the REF lamp flashes.
7.53 All status lamps on the TNC card front panel
are duplicated as ALARM status leads on the shelf
backplane. A switch option on the shelf backplane is
provided to enable either major or minor alarm status when both TNC clocks are in holdover mode.
G. LNC Card
7.54 The LNC card provides a stable reference to
drive the TO cards. During normal operation, the local node clock is derived from clock input card A or
clock input card B. In a normally operating, fully
equipped shelf, the LNC card uses the signal from
the clock input card that was installed first. If the
card in the MR A slot fails or is not equipped, the
LNC card uses the signal from the card in the MR B
slot. The input reference (REF) may be manually
switched by pressing the transfer (XFR) push button
on either clock input card.
7.55 If the input reference is within the pull-in
range of the LNC card, any phase or frequency difference between the input reference and the center
frequency of the LNC card’s internal oscillator is reduced to zero and locked to the reference signal using feedback.
7.56 The LNC card output is taken from the clock
synthesizer which produces a common reference timing signal on the shelf backplane. The output stays
locked to either reference input as long as the following conditions exist:
• Input reference signal is within the pull-in range.
TMSL 097-45230-01
• Rate of change (slope) of the input reference is
less than the input tolerance.
7.57 The synthesizer was built with a frequency adjustment range to accommodate temperature and
aging variations over the service lifetime of the card.
Changes to the synthesizer are in frequency steps,
which allows the synthesizer to act as an “electronic
flywheel” and buffer the phase and frequency changes of the input.
7.58 If the input reference signals are either unavailable or out of range, the LNC card will change
state and enter a holdover mode. The last 24 hours
of input frequency samples are stored, averaged, and
continuously updated. The synthesizer uses this value, which is known to be good, as the clock center frequency. When the input signals are restored and lock
is achieved, the LNC card exits the holdover mode.
7.59 Fault tolerance is achieved in the DCD Shelf
by using redundant clock input signals (via paired
clock input cards) and redundant LNC cards. If one
of the clock input cards or reference signals fails, the
LNC card automatically switches to the signal from
the other clock input card.
7.60 The outputs from both LNC cards and both
clock input cards are available to the TO cards for selection based on preset priorities.
8. TIMING OUTPUT CARD DESCRIPTIONS
A. EA10 Card
8.01 The EA10 card provides 10 E1 output signals
with framing, or 10 analog output signals at
2.048 MHz. Each output can be set to digital or analog signals independently by TL1 commands, or in
groups of five outputs by switch settings. The EA10
card can be used as a stand-alone output card, or can
be paired with an adjacent EA10 card to provide redundant-pair (1:1 or 1+1) outputs.
Note: Do not use an EA10 card in a 1:N protection mode.
8.02 EA10 cards communicate with an MISV5 card,
which provides full messaging, status reporting, and
configuration control.
• Maximum frequency step of the input reference
signal is less than the input tolerance.
Page 39
TMSL 097-45230-01
Stand-alone Configuration
8.03 The card obtains the timing signal from the
DCD internal timing bus (clock card A, clock card B,
clock input A or clock input B), according to the priority in Table G. If no input timing signals are
present, the EA10 card turns off its ST and INP
lamps, lights the FAIL lamp, and squelches the outputs.
8.04 Framing format (CAS or CCS with or without
CRC4) is set by card switches or TL1 commands.
Front panel lamps indicate the selected framing format for each card.
8.05 Switches or TL1 commands select the timing
signal type (E1 or analog). The E1 or analog timing
signal is applied to each port driver and sent through
an impedance-matching transformer to the output
connector.
8.06 A switch or TL1 commands set the port alarm
severity to minor or major for the card. An alarm on
any port generates the alarm selected. A port alarm
is detected only for the failure of the port hardware
on the card.
8.07 A switch or TL1 commands sets the card for revertive or nonrevertive switching of the input timing
signals. When the card is configured for nonrevertive
switching, the four sources on the internal bus are
separated into the following groups:
• Clock source group (ST A and ST B)
• Clock input source group (CI A and CI B)
8.08 In nonrevertive mode, the EA10 card minimizes input reference switching by not reverting to a
previous reference source within the same group.
For example, the EA10 card switches to the ST B reference if ST A fails. The EA10 card does not revert to
ST A when ST A is restored, because the EA10 card
is using a signal in the clock source group. The reference switches to CI A if both ST A and ST B fail. If
the EA10 card is using the CI A reference and one of
the sources in the clock group is restored, the EA10
card reverts to the highest available source (ST A or
ST B) in the clock source group.
8.09 When the EA10 card is configured for revertive switching, the highest available source is always
used (refer to Table G for a prioritized list of the input timing signals). If any source fails, the EA10
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Issue 13: Mar 00
card switches its reference to the source that is next
in priority. If any higher priority source is restored,
the EA10 card switches its reference to that source.
1:1 Output Protection Configuration
8.10 A 1:1 pair must be installed in one of the following
slot pairs: TO1&TO2, TO3&TO4, TO5&TO6,
TO7&TO8, TO9&TO10, or HS1&HS2. A double-wide
output module must be installed on the interface panel.
If the paired cards are configured to communicate with
an MIS card, switch settings and TL1 parameters for
both cards in the pair must be identical. If the paired
cards are not configured to communicate with an MIS
card, only the switch settings for both cards in the pair
must be identical. Both cards in the pair must be using
the same input reference from the internal DCD timing
bus. A pair of EA10 cards provides ten timing outputs.
Each EA10 card in the pair performs all the functions of
the EA10 card in a stand-alone configuration, plus communication with the other card in the pair and with the
MISV5 card.
8.11 In a 1:1 pair, one card is active and the other
card squelches its outputs. If the active card fails,
the mate becomes the active card, minimizing disruption to the timing outputs.
8.12 The EA10 card in the odd-numbered slot of the
pair checks for a card in the even-numbered slot. If a
card exists, the card in the odd-numbered slot checks
for compatible hardware and software revisions, and
checks for identical operating parameters, including
port output settings. The card in the even-numbered
slot checks for a compatible card in the odd-numbered slot. The card in the odd slot becomes the active card of the pair.
8.13 When the internal EA10 card checks have
been completed, a switch setting determines whether timing outputs are immediately enabled, or
whether TL1 commands enable the outputs.
8.14 If either EA10 card finds that its mate is not compatible or does not exist, the EA10 card will not become
active until the user intervenes. If the EA10 card is configured to communicate with an MIS card, the MIS card
sends an error message. The EA10 card resumes functioning after the user sends appropriate commands, or if
a compatible card is installed in the other slot.
8.15 Both cards in the pair can be configured to
communicate configuration, status, and alarm information to a MISV5 card in the shelf.
Issue 13: Mar 00
1+1 Output Protection Configuration
8.16 A 1+1 redundant pair must be installed in one
of the following slot pairs: TO1&TO2, TO3&TO4,
TO5&TO6, TO7&TO8, TO9&TO10, or HS1&HS2.
Switch settings and TL1 parameters for both cards
in the pair must be identical if the cards are configured to communicate with an MIS card. If the cards
are not configured to communicate with an MIS
card, only the switch settings for both cards must be
identical. Both cards in the pair must be using the
same input reference from the internal DCD timing
bus. A double-wide output module must be installed
on the I/O panel.
8.17 In a 1+1 pair, the timing signals from each card
are attenuated so that the combined output at the interface module is the correct power level. Each EA10
card in the 1+1 pair performs all the functions of a
card in a stand-alone configuration, plus communication with the other card in the pair and with the
MISV5 card. Each pair of EA10 cards provides ten
timing outputs.
8.18 If a card fails, the outputs of that card are
squelched and the mate increases the power on its
outputs, minimizing disruption to the timing outputs.
8.19 Power-up and fault detection actions are the
same as for the 1:1 card pair.
B. EA10M Card
8.20 The EA10M card functions the same as the
EA10 card, plus it is SSM capable. SSMs are transmitted continuously until there is a state change initiated by the MIS. Also, the user can assign output
messages by TL1 command.
C. TOAA Card
8.21 The TOAA card outputs two sine wave outputs
with selectable frequencies at various voltage levels
and impedances. Six different TOAA cards are available (090-40022-01, -02, -03, -05, -15, and 090-4002810).
8.22 The TOAA 090-40022-xx card outputs are fed
to the MMP equipped with a BNC output kit for each
TOAA card installed. A selection of plug-in level-coordinating attenuators are provided with the BNC
output kit. Ideally, the level should be attenuated at
the terminating end of the cable.
TMSL 097-45230-01
8.23 The TOAA 090-40028-10 card outputs are
available on the front panel of the card.
Note: Do not use a TOAA 090-40028-10 card
in a 1:N protection mode.
D. TOCA Card
8.24 The TOCA card provides 10 composite clock
timing outputs.
8.25 The card obtains the timing signal from clock
card A or B, or clock input A or B bus, according to
the priority in Table G. If no input timing signals are
present, the TOCA card turns off its ST and INPUT
lamps, lights the FAIL lamp, and mutes the outputs.
8.26 The outputs are fed to the interface panel (if
configured with an MMP, the MMP must be equipped
with the appropriate output kit, one for each TOCA
card installed).
E.
TOGA Card
8.27 The TOGA card provides ten 2.048 MHz G.703
outputs. A source select circuit obtains the timing
signal from clock card A or B, or clock input A or B
bus, according to the priority in Table G. If no input
timing signals are present, the TOGA card turns off
its ST and INPUT lamps, lights the FAIL lamp, and
mutes the outputs.
8.28 A PLL circuit reconstitutes the internal timing signal. The switch-selectable cable compensation settings are transferred to the HS TOGA card
during protection switching. The reconstituted
timing signal is then applied to each port driver
and sent through an impedance-matching transformer.
8.29 The outputs are fed to the interface panel (if
configured with an MMP, the MMP must be
equipped with the appropriate output kit, one for
each TOGA card installed).
F.
TO-EA5 Card
8.30 The TO-EA5 card provides ten E1 output signals with framing, or ten 2.048 MHz G.703 output
signals. Each output can be set to digital or 2 MHz
signals independently. The TO-EA5 card can be used
as a stand-alone output card, or can be paired with
an adjacent TO-EA5 card to provide redundant (1:1
or 1+1) outputs.
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TMSL 097-45230-01
Issue 13: Mar 00
8.31 The TO-EA5 cards communicate with an
MISV5 card, which allows configuration of operating
parameters and retrieval of status and alarm information for the TO-EA5 cards in a shelf.
8.38 When the TO card is configured for revertive
switching, the highest available source is always
used (refer to Table G for a prioritized list of the input timing signals). If any source fails, the TO card
switches its reference to the source that is next in
priority. If any higher priority source is restored, the
TO card switches its reference to that source.
Stand-alone Configuration
1:1 Output Protection Configuration
8.32 The card obtains the timing signal from clock card
A or clock card B, or clock input A or B bus, according to
the priority in Table G. If no input timing signals are
present, the TO-EA5 card turns off its ST and INP
lamps, lights the FAIL lamp, and squelches the outputs.
8.39 The TO-EA5 card 1:1 output protection configuration consists of two TO-EA5 cards installed in adjacent slots, and a double-wide interface module
installed on the MMP. Switch settings and TL1 parameters for both cards in the pair must be identical.
Both cards in the pair must be using the same input
reference from the internal DCD timing bus. Each
TO-EA5 card in the 1:1 pair performs all the functions of the TO-EA5 card in a stand-alone configuration, plus communication with the other card in the
pair and with the MISV5 card. Each pair of TO-EA5
cards provides ten timing outputs.
Note: Do not use a TO-EA5 card in a 1:N protection mode.
8.33 Framing format (CAS or CCS with or without
CRC4) is set by card switches or TL1 commands issued
through the MISV5 card. Front panel lamps indicate the
selected framing format on a per-card basis.
8.34 Card switches or TL1 commands select the
timing signal type (E1 or analog). The E1 or analog
timing signal is applied to each port driver and sent
through an impedance-matching transformer to the
output connector.
8.35 A switch or TL1 commands can set the port
alarm severity to minor or major for the card. Any
port alarm generates the alarm selected.
8.36 The TO-EA5 card can be configured (via
switches or TL1 commands) for revertive or nonrevertive switching of the input timing signals. When
the card is configured for nonrevertive switching, the
four sources on the internal bus are separated into
the following groups:
• Clock source group (ST A and ST B)
8.40 In a 1:1 pair, one card is active and the other
card squelches its outputs. If the active card fails,
the mate becomes the active card, minimizing disruption to the timing outputs.
8.41 The card in the odd-numbered slot becomes
the active card, and the card in the even-numbered
slot becomes the standby card. The active card verifies that the pair have compatible hardware and
software revisions, and identical operating parameters, including port output settings.
8.42 Timing outputs are not available until PLLs on
both cards are locked. When the internal TO-EA5 card
checks have been completed, a switch setting determines whether timing outputs are immediately enabled, or whether TL1 commands enable the outputs.
• Clock input source group (CI A and CI B)
8.37 In nonrevertive mode, the TO card minimizes
input reference switching by not reverting to a previous reference source within the same group. For
example, the TO card switches to the ST B reference
if ST A fails. The TO card does not revert to ST A
when ST A is restored, because the TO card is using
a signal in the clock source group. The reference
switches to CI A if both ST A and ST B fail. If the TO
card is using the CI A reference and one of the sources in the clock group is restored, the TO card reverts
to the highest available source (ST A or ST B) in the
clock source group.
Page 42
8.43 When a fault is detected, both the active and
standby cards determine if the fault is local, or with
the other card, or external to the cards. In general, if
one of the paired cards is faulty, the fault-free card
becomes the active card. For example, if an active
card in the odd-numbered slot detects local faults
and the standby card is free of faults or contains
faults with less severity, the card in the even-numbered slot becomes the active card.
8.44 The card in the even slot remains the active
card until the card faults or all of its ports have
failed. If the card in the odd-numbered slot does not
Issue 13: Mar 00
have a major alarm, the card in the odd-numbered
slot becomes the master and active card again. If not,
or if both cards detect MAJOR alarms, all timing
outputs are disabled and the cards are removed from
service.
1+1 Output Protection Configuration
8.45 The TO-EA5 card 1+1 output protection configuration consists of two TO-EA5 cards installed in
adjacent slots, and a double-wide interface module
installed on the MMP. Switch settings and TL1 parameters for both cards in the pair must be identical.
Both cards in the pair must be using the same input
reference from the internal DCD timing bus. Each
TO-EA5 card in the 1+1 pair performs all the functions of the TO-EA5 card in a stand-alone configuration, plus communication with the other card in the
pair and with the MISV5 card. Each pair of TO-EA5
cards provides ten timing outputs.
8.46 The timing signals from each card are attenuated so that the final combined output from the interface module is the correct power level.
8.47 Power-up and fault detection actions are the
same as for the 1:1 card pair.
G. TO-EA Card
8.48 The TO-EA card may be used in standalone operation, or in redundant-pair (1+1) output protection.
The card provides ten outputs, either 2.048 Mb/s E1
outputs with CAS or CCS formats (with or without
CRC-4), or ten 2.048 MHz G.703 outputs, or any combination of digital or analog outputs.
Note: Do not use a TO-EA card in a 1:N protection mode.
8.49 The card obtains the timing signal from the
DCD internal timing bus (clock card A, clock card B,
clock input A or clock input B), according to the priority in Table G. If no input timing signals are
present, the TO-EA card turns off its ST and INP
lamps, lights the FAIL lamp, and squelches the outputs.
8.50 The reference input is fed into a PLL circuit,
and the reconstituted signal is sent to framing and
analog circuit generators; framing format (CAS or
CCS with or without CRC4) is set through card
switches. Front panel lamps indicate the selected
framing format.
TMSL 097-45230-01
8.51 From the framing and analog circuitry, the signal is sent through a multiplexer where card switches are used to select the timing signal type (E1 or
analog).
8.52 The E1 or 2.048 MHz timing signal is then applied to each port driver and sent through an impedance-matching transformer. Both cards in the pair
are power-combined to drive the outputs.
8.53 The TO-EA card may be switch-selectable for revertive or non-revertive switching of the input signal.
For example, if set for revertive switching, and clock
card A is supplying timing, if the signal is lost, a switch
is made to clock card B. If clock card A comes back, the
TO-EA card reverts back to clock card A. If all four signals are bad, the card fails.
8.54 If set for non-revertive switching, the TO-EA
card will not revert backwards through the priority
hierarchy (Table G), unless the card currently supplying timing is a clock input card. If the card currently supplying timing is a clock input card, and a
clock card becomes active, the TO-EA card will
switch to the highest level clock card available. If all
four references have been disqualified or failed, the
TO-EA card lights the FAIL lamp.
8.55 The 1+1 output protection mode, when used
with the output modules and special cabling, provide
smart fault grading, power combination, and redundant output protection. The outputs of the 1+1 card
pairs are power combined to drive the outputs simultaneously.
H. TO-EAN Card
8.56 The TO-EAN card provides ten E1 output signals with framing, or ten 2.048 MHz G.703 output
signals. Consecutive outputs can be set to digital or
analog signals. The TO-EAN card can be used as a
stand-alone output card or in a 1:N configuration. A
TO-EAN card in a managed shelf with 1:N protection requires an MISV5 card with version 5.05.01 or
later software, and an MCA-5M card.
Note: The TO-EAN card cannot be operated
in a 1:1 or 1+1 protection configuration.
8.57 The TO-EAN cards communicate with an
MISV5 card, which allows configuration of operating
parameters and retrieval of status and alarm information for the TO-EAN cards in a shelf.
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TMSL 097-45230-01
8.58 The card obtains the timing signal from clock
card A or clock card B, or clock input A or B bus, according to the priority in Table G. If no input timing
signals are present, the TO-EAN card turns off its
ST and INP lamps, lights the FAIL lamp, and
squelches the outputs.
8.59 Framing format (CAS or CCS with or without
CRC4) is set by card switches or TL1 commands issued through the MISV5 card. Front panel lamps indicate the selected framing format on a per-card
basis.
8.60 Card switches or TL1 commands select the
timing signal type (E1 or analog). The E1 or analog
timing signal is applied to each port driver and sent
through an impedance-matching transformer.
Issue 13: Mar 00
I.
8.65 The TOEA card provides 10 E1 outputs with
either CAS or CCS formats (with or without CRC-4).
8.66 The card obtains the timing signal from the DCD
internal timing bus (clock card A, clock card B, clock input A or clock input B), according to the priority in
Table G. If no input timing signals are present, the
TOEA card turns off its ST and INP lamps, lights the
FAIL lamp, and squelches the outputs.
8.67 The outputs are fed to the interface panel (if
configured with an MMP, the MMP must be equipped
with the appropriate output kit, one for each TOEA
card installed).
J.
8.61 A switch or TL1 commands can set the port
alarm severity to minor or major for the card. Any
port alarm generates the alarm selected.
8.62 The TO-EAN card can be configured (via
switches or TL1 commands) for revertive or nonrevertive switching of the input timing signals. When
the card is configured for nonrevertive switching, the
four sources on the internal bus are separated into
the following groups:
• Clock source group (ST A and ST B)
• Clock input source group (CI A and CI B)
8.63 In nonrevertive mode, the TO card minimizes
input reference switching by not reverting to a previous reference source within the same group. For
example, the TO card switches to the ST B reference
if ST A fails. The TO card does not revert to ST A
when ST A is restored, because the TO card is using
a signal in the clock source group. The reference
switches to CI A if both ST A and ST B fail. If the TO
card is using the CI A reference and one of the sources in the clock group is restored, the TO card reverts
to the highest available source (ST A or ST B) in the
clock source group.
8.64 When the TO card is configured for revertive
switching, the highest available source is always
used (refer to Table G for a prioritized list of the input timing signals). If any source fails, the TO card
switches its reference to the source that is next in
priority. If any higher priority source is restored, the
TO card switches its reference to that source.
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TOEA Card
TOLA Card
8.68 The TOLA card is available in several models.
Each model provides five timing outputs whose frequencies are switch-selectable from one of four
groups. Front-panel lamps indicate which group has
been selected.
8.69 The timing outputs for all but the TOLA
090-40023-03 card are RS-422. By connecting between one side of the RS-422 output and signal
ground, up to 10 RS-423 outputs are supported. The
RS-422 outputs are balanced driver outputs, and the
RS-423 outputs are unbalanced driver outputs. The
TOLA 090-40023-03 card outputs are RS-232 only
and cannot be configured as TTL outputs.
8.70 A source select circuit obtains the timing signal
from either the clock card A or B, or clock input A or B
bus according to the priority as shown in Table G. If no
input timing signals are present on the buses, the
TOLA card turns off both its ST and INPUT lamps,
lights the FAIL lamp, and mutes the outputs.
K. TOTL Card
8.71 The TOTL card provides 10 framed all-ones T1
timing outputs (1.544 MHz) with line build-out. The
TOTL card’s output timing signal generator is always enabled.
8.72 A source select circuit obtains the timing signal from clock card A or clock card B, or clock input
A or B bus according to the priority in Table G. If no
input timing signals are present on the buses, the
TOTL card turns off both its ST and INPUT lamps,
lights the FAIL lamp, and mutes the outputs.
Issue 13: Mar 00
8.73 The framing circuitry allows the user to set
the framed all-ones format to D4 or ESF framing.
The T1 timing signal is then applied to each port
driver and sent through an impedance-matching
transformer.
L.
TOTA and TOTA-5 Cards
8.74 The TOTA and TOTA-5 cards provide 10 T1
(1.544 Mb/s) timing outputs. The TOTA-5 card provides the following features:
• Configuration of port alarm severity, trouble
code format, and revertive and nonrevertive
switching, using a switch on the card.
• Communication with the MISV5 card, which provides configuration of operating parameters and
reference control, retrieval of status and alarm
information, and the capability to download configuration information to a new MISV5 card.
Note: A TOTA-M card may be installed in the
same shelf as a TOTA-5 card; however, there
may be delays in SSM messaging.
8.75 The card obtains the timing signal from the
quad bus according to the priority in Table G. If no
input timing signals are present on the buses, the
TOTA card turns off both its ST and INPUT lamps,
lights the FAIL lamp, and squelches the outputs.
The TOTA-5 card turns off both its ST and INP
lamps, lights the FAIL lamp, and either squelches
the timing outputs or transmits an all-ones signal
upon the detection of no input timing signals. The
trouble code format on the TOTA-5 card can be configured by using a switch or issuing the appropriate
TL1 command via a MISV5 card equipped in the
shelf.
8.76 The outputs are fed to the output panel (if configured with an MMP, the MMP must be equipped
with the appropriate output kit, one for each card installed).
TOTA Card Switch
8.77 SW1 on the TOTA card allows the configuration
of TOTA card operating parameters. SW1 can be used
to set the framing format to D4 or ESF. SW1 can also
be used to enable a TOTA/MCA card combination to
register a port alarm if a disabling pin is inserted into
one of the disabling jacks on the TOTA card.
TMSL 097-45230-01
TOTA-5 Card Switch
Note: The TOTA-5 card operating parameters that can be configured by SW1 can also be
configured by issuing the appropriate TL1
command via the MISV5 card (refer to the TL1
User’s Guide for information about the MISV5
TL1 commands).
8.78 SW1 on the TOTA-5 card allows the configuration of TOTA-5 card operating parameters. SW1 can
be used to set the framing format to D4 or ESF. The
switch allows the configuration of the trouble code for
a major alarm condition; the user can choose between
the transmission of an all-ones signal or the disabling
of timing outputs after a major alarm event.
8.79 Port alarm severity can be set either to minor
or major through SW1 on the TOTA-5 card. Any port
alarm (up to nine failed ports) will generate the
alarm selected. If 10 timing output ports fail, the
FAIL lamp lights and a major alarm is declared.
8.80 SW1 on the TOTA-5 card allows the card to use
nonrevertive or revertive switching for the input timing signals. When the card is configured for nonrevertive switching, the four sources on the internal bus
are separated into the following individual groups:
• Clock source group (ST A and ST B)
• Clock input source group (CI A and CI B)
8.81 The sources are nonrevertive within the
groups and only revert from the clock input source to
the clock source group. For example, the reference
switches to ST B if ST A fails. The TO card reference
does not revert to ST A when ST A is restored because the TO card is using a signal in the clock
source group. The reference switches to CI A if both
ST A and ST B fail. If one of the sources in the clock
source group is restored, the TO card reverts to the
highest available source (ST A or ST B) in the clock
source group.
8.82 When the TO card is configured for revertive
switching, the highest available source is always
used (refer to Table G for a prioritized list of the input timing signals). If any source fails, the TO card
selects the source that is next in priority. If any higher priority source is restored, the TO card selects
that source as the reference.
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TMSL 097-45230-01
8.83 SW1 on the TOTA-5 card enables and disables
communication between the TOTA-5 and MISV5
cards. If the communication is enabled, the user can
use TL1 commands to configure operating parameters and retrieve configuration, status, and alarm information from the TOTA-5 card.
M. TOTA-M Card
8.84 The TOTA-M card generates SSM messages in
addition to performing all of the functions of the
TOTA-5 card. The MIS card determines the correct
SSM message to send, and commands the TOTA-M
card to relay that message If the MIS card fails or is
removed, the TOTA-M card sends a predefined SSM
message.
Note: Where SSM messages are required, it is
recommended that TOTA-M cards replace all
other TOTA-series cards in the shelf. The reaction speed of the TOTA-M to deliver the correct
message may be affected if a TOTA-M card is installed in the same shelf as a TOTA-5 card.
9. MCA-5M CARD AND OUTPUT PROTECTION
MATRIX
9.01 An MCA-5M card provides 1:N output protection in a managed DCD shelf. A managed shelf requires an MISV5 card with version 5.05.01 or later
software. The MCA-5M card controls the output protection switch matrix, an integral part of the shelf located just above the card slots.
9.02 The output protection switch matrix contains the
HS signal bus, push button switches to select the TO
and HS card outputs, and a lamp for each TO and HS
slot.
Caution: Some restrictions apply when selecting TO and HS TO cards. If an HS TO
card is not compatible with a TO card installed in either a TO or HS slot, incorrect
protection switching could occur. Refer to
Table E for a list of incompatible HS TO
and TO cards.
9.03 The TO slots in the shelf contain the cards that
normally provide the shelf outputs. The HS slots in
the shelf contain one or two hot spare (HS) cards.
The MCA-5M card and output protection matrix control whether the card in a TO slot or the card in an
HS slot supplies the shelf output signal.
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Issue 13: Mar 00
9.04 Only one of the two HS slots can supply an output signal at a given time. Two HS slots are provided
to allow protection for two kinds of TO card, or a
deeper level of protection. Activating a protection
switch between the TO and HS slots can be either
automatic or manual.
Note: The MCA-5M card can be in automatic
mode or manual mode, as directed by a switch
on its circuit board. Automatic mode allows
both automatic and manual switching. Manual mode allows only manual switching, and
many features of the automatic mode are inactive. It is recommended that the MCA-5M be
kept in automatic mode, and this section discusses the automatic mode of the MCA-5M.
9.05 The MCA-5M card continuously polls the slots
in the shelf. If a TO card in 1:N protection reports an
alarm, the MCA-5M card activates the relays and
lamps in the protection matrix to switch the appropriate HS card to the shelf output path. The AUTO
lamp on the MCA-5M card indicates the last switch
was automatic.
9.06 Another TO card of the same type can report a
failure while the HS card is active. The MCA-5M
card switches the HS card again if the newer failure
has a higher priority. The TO card that had been protected is placed back into service.
Note: In the event of multiple simultaneous
TO card failures, where the failures are in
slots with differing priorities, the MCA-5M
card may perform multiple HS switches.
These switches may cause timing hits at the
shelf outputs. Set every TO slot in the shelf to
the same priority to avoid this problem.
9.07 A manual output protection switch is activated
when the push button for the TO card and the HS
card are pressed simultaneously and held down until
both lamps light (about 5 seconds). When the buttons are pressed and held again, the lamps turn off
and the TO card delivers the output signal. The
MAN lamp on the front panel of the MCA-5M card
indicates the previous switch was manual.
9.08 Whenever manual or automatic protection
switching takes place, the TO card automatically
transfers option switch settings to the HS card.
Issue 13: Mar 00
9.09 After a protection switch, individual port
alarms on the TO card can be identified by pressing
the push button above the switched TO card. The
lighted PORT ALM lamps (1 to 10) on the MCA-5M
card front panel correspond to the port alarms on the
switched TO card.
TMSL 097-45230-01
10.02 The output protection switch matrix contains
the HS signal bus, push button switches to select the
TO and HS card outputs, and a lamp for each TO and
HS slot.
9.10 An HS card cannot accidentally be placed in
service, and an active TO card cannot accidentally be
taken out of service. Activating the HS card requires
one of the switch criteria, a TL1 command, or a manual switch.
Caution: Some restrictions apply when selecting TO and HS TO cards. If an HS
card is not compatible with a TO card installed in either a TO or HS slot, incorrect
protection switching could occur. Refer to
Table D for a list of incompatible HS and
TO cards.
9.11 A protection switch remains active until the
failed TO card has been replaced and found faultfree by the MIS card and the MCA-5M card. If the
protection switch was initiated by TL1 command,
the MIS card instructs the MCA-5M card to release
the protection switch command.
10.03 The TO slots in the shelf contain the cards
that normally provide the shelf outputs. The HS
slots in the shelf contain one or two hot spare (HS)
cards. The MCA-5 card and output protection matrix
control whether the card in a TO slot or the card in
an HS slot supplies the shelf output signal.
9.12 TL1 commands can set the protection priority
of any TO card in the shelf. High-priority cards are
protected before low-priority cards, including replacing low-priority cards in a protection switch.
10.04 Only one of the two HS slots can supply an
output signal at a given time. Two HS slots are provided to allow protection for two kinds of TO card, or
a deeper level of protection. Activating a protection
switch between the TO and HS slots can be either
automatic or manual.
9.13 If protection priority is not used, the MCA-5M
card protects cards based on the severity of the fault.
The priorities are based on the following failure levels:
a. Card failure is the highest level. Card failure
is defined as circuitry failure, loss of all card
outputs, or as a loss of communication between
the MCA-5M card and an output card.
b. Intermediate failure levels are determined by
the number of port failures on a card. For example, an output card with four failed ports is
judged more severe than an output card with
two failed ports.
c.
A card with a single port failure is the lowest
failure level.
10. MCA-5 CARD AND OUTPUT PROTECTION
MATRIX
10.01 An MCA-5 card provides 1:N output protection in the DCD shelf. An MCA-5 card controls the
output protection switch matrix, an integral part of
the shelf located just above the card slots.
Note: The MCA-5 card can be in automatic
mode or manual mode, as directed by a switch
on its circuit board. Automatic mode allows
both automatic and manual switching. Manual mode allows only manual switching, and
many features of the automatic mode are inactive. It is recommended that the MCA-5 is
kept in automatic mode, and this section discusses the automatic mode of the MCA-5.
10.05 When an active TO card indicates a failure, is removed, or loses communication, the MCA-5 card activates the relays and lamps in the protection matrix and
switches the appropriate HS card into the shelf output
path. The AUTO lamp on the front panel of the MCA-5
card indicates the previous switch was automatic.
10.06 A manual output protection switch is activated when the push button for the TO card and the HS
card are pressed simultaneously and held down until
both lamps light (about 5 seconds). When the buttons are pressed and held again, the lamps turn off
and the TO card delivers the output signal. The
MAN lamp on the front panel of the MCA-5 card indicates the previous switch was manual.
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TMSL 097-45230-01
10.07 After switching has taken place, individual
port alarms can be identified by pressing the push
button above the failed card. This action lights the
corresponding PORT ALM lamp (1 to 10) on the
MCA-5 card front panel.
10.08 Whenever manual or automatic protection
switching takes place, the TO card automatically
transfers option switch settings to the HS card.
10.09 After a protection switch, individual port
alarms on the TO card can be identified by pressing
the push button above the switched TO card. The
lighted PORT ALM lamps (1 to 10) on the MCA-5
card front panel correspond to the port alarms on the
switched TO card.
10.10 The system uses the HS card outputs until
the card in the TO slot is manually restored or another TO card reports a higher level failure.
10.11 An HS card cannot accidentally be placed in
service, and an active TO card cannot accidentally
be taken out of service. Activating the HS card requires one of the switch criteria or a manual
switch.
10.12 The MCA-5 card keeps track of all TO card
failures. During a protection switch, if a port
alarm is transferred to the HS card (indicating an
external cable problem), the MCA-5 card switches
back to the original TO card and locks it out from
the protection function until the alarm clears. This
lockout is done to prevent the cards from constant
protection switching.
10.13 If the MCA-5 card experiences a communications loss or intermittent communication with
all the cards within the shelf, all 10 port alarm
lamps will light. At this point, a major alarm is initiated and automatic switching inhibited. Manual
switching is activated to allow switching out of
cards to isolate the malfunctioning card. This condition remains until the fault is corrected. If the
card fails, a major alarm is generated, and the
FAIL lamp on the MCA-5 card lights. If this occurs,
the card must be replaced.
10.14 The MCA-5 card provides protection switching for any failed TO card or port. If several failures
occur on different TO cards, the MCA-5 card mediates the protection switches on a priority basis. The
priorities are based on the following failure levels:
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Issue 13: Mar 00
a. Card failure is the highest level. Card failure
is defined as circuitry failure, or as a loss of
communication between the MCA-5 card and
an output card.
b. Intermediate failure levels are determined by
the number of port failures on a card. For example, an output card with four failed ports is
a higher level than an output card with two
failed ports.
c.
A card with a single port failure is the lowest
failure level.
10.15 Protection switching is provided for the card
with the highest failure level. Examples of failure
mediation follow.
• If a single port on a single card fails, a protection
switch will be made for the card.
• If multiple cards report failures, protection will
be provided for the output card with the highest
failure level.
• If protection switching has occurred for one card
and another card reports a lower level failure,
protection will remain with the card that has the
higher failure level.
• If protection switching has occurred for one card
and another card reports a higher level failure,
protection will be provided for the card with the
higher failure level.
• If two cards report the same failure level, protection will be provided for the card that first reported the failure.
• As failures are cleared, protection is provided for
the card with the highest current failure level.
11. INSERTION CARD DESCRIPTIONS
A. SCIU Card
11.01 The SCIU card is an elastic buffer that synchronizes an incoming or outgoing DS1 facility with
an external timing source. The SCIU isolates the
synchronization of a DS1 circuit while inserting
office timing. The SCIU card interfaces a bidirectional DS1 signal and provides retiming in the A direc-
Issue 13: Mar 00
tion while passing the DS1 through in the B
direction. The SCIU card is cabled directly into the
traffic bearing DS1 bitstream being retimed.
11.02 A source select circuit in the SCIU card selects the timing reference according to the priorities
shown in Table G. With a valid reference, the SYNC
lamp lights green. If a reference is not present, the
SYNC lamp lights red. The 4 kHz reference is then
fed to a PLL circuit with an output frequency of
1.544 Mb/s. This signal is used to clock the elastic
buffer output, and the transmit line driver.
11.03 In the DS1 A direction, the DS1 signal is applied to the line interface and clock recovery circuit.
The signal is converted to a unipolar format that
passes all coding and logic errors through the SCIU
card intact. The input signal is also applied to an offline framer where framing is monitored. Front panel
lamps indicate LOS, OOF, and slips that cause excessive reframe conditions. A set of status leads also
provides a framing status output.
11.04 The output from the clock recovery circuit
clocks the signal into the elastic buffer, which is a
bank of six 64-bit first in, first out (FIFO) storage devices. The FIFO bank holds two DS1 frames. The
DS1 bit stream is clocked into the center of the buffer
by the write clock and is clocked by the read clock out
of the buffer to the output line driver and line buildout (LBO) circuitry.
11.05 If the read and write clocks are at the same
rate, the data stays at the center of the buffer. However, if the write clock is faster or slower than the stable
read clock, the FIFO begins to fill to the left or right.
As the FIFO devices fill or empty to 128 bits, a lamp
is lit, and the slip warning status lead is activated.
11.06 When the last FIFO device is full (192 bits or
one DS1 frame), a frame slip indication is set and a
count started that triggers the excessive slip indication after eight slips. During the count, the frame
slip lamp stays lit, but the 64- and 128-bit slip lamps
are reset. The slip also activates the SLIP status
lamp for 5 seconds.
Slip Monitoring
11.07 The SCIU card provides bit slip (preslip) and
frame slip indications via front panel lamps and status data to local and remote monitoring systems.
DS1 failure (LOS), system reference, and bypass indications are also given.
TMSL 097-45230-01
11.08 At the frame slip point when the buffer is
filled, an uncontrolled slip occurs. However, no zeros
are transmitted downstream; thus, only a COFA
(change of frame alignment) may be detected by the
downstream device if the frame bit moves out from
the buffer in the receiving equipment.
11.09 If the on-line framer detects an LOS or OOF
condition in the DS1 input, the SCIU card transmits
(if optioned to do so) a framed all-ones signal at the
reference rate to allow the downstream device to
continue to recover timing. An LOS or OOF condition also resets the slip lamps and counter. The framer may be disabled by an option switch. Disabling
the framer allows unframed DS1 signals to be
passed by the SCIU card.
11.10 In the DS1 B direction, the signal enters the
SCIU card and is applied to the line interface and
clock recovery circuit. The data and recovered clock
are then fed directly to the line driver and line buildout. No signal processing occurs other than detecting
the LOS conditions, which are indicated with a status point and the bicolored DS1 B lamp. Jitter is attenuated in the B direction.
DS1 Bypass
11.11 Both A and B directions have bypass relays in
the event of a reference failure, card failure, power
loss, or if the SCIU card is removed from the shelf.
The SCIU card provides two types of bypass—electronic and relay. If the input reference is lost, an electronic bypass on the SCIU card is activated. A front
panel jack is provided to allow manual activation of
the electronic bypass. A lit BYPASS lamp indicates
the electronic bypass is active.
11.12 An alarm is set when the electronic bypass is
active; this is the same as is set for DS1 A (major,
minor, or no alarm). A relay bypass on the SCIU I/O
module is activated if the SCIU card fails, if dc power is lost, or if the SCIU card is removed from the
shelf.
Slip Monitor Mode
11.13 The SCIU card can also be used in a slip monitor-only mode. In the monitor mode, the DS1 A line
interface acts as a bridging input. The connection to
the DS1 to be monitored must be made through a
pair of 432 Ω bridging resistors or the DSX-1 monitor
jack. The DS1 A input is applied to the FIFO, and
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TMSL 097-45230-01
slip information is obtained and displayed in reference to the SCIU reference, as above. In the slip
monitor mode, DS1 B is disabled.
B. ESCIU Card
Note: The DCD-523 only supports E1 as a balanced input signal at 120 Ω for the ESCIU
card.
11.14 The ESCIU card is an elastic buffer that synchronizes an incoming or outgoing E1 facility with
an external timing source. The ESCIU card isolates
the synchronization of an E1 circuit. The ESCIU
card interfaces a bidirectional E1 signal and provides retiming in the A direction while passing the
E1 through in the B direction. The ESCIU card is cabled directly into the traffic bearing E1 bitstream being retimed.
11.15 A source select circuit in the ESCIU card selects the timing reference according to the priorities
shown in Table G. With a valid reference, the SYNC
lamp lights green. If a reference is not present, the
SYNC lamp lights red. The 4 kHz reference is then
fed to a PLL circuit with an output frequency of
2.048 MHz. This signal is used to clock the elastic
buffer output, and the transmit line driver.
11.16 In the E1 A direction, the E1 signal is applied
to the line interface and clock recovery circuit. The
signal is converted to a unipolar format that passes
all coding and logic errors through the ESCIU card
intact. The input signal is also applied to an off-line
framer where framing is monitored. Front panel
lamps indicate LOS, OOF, and slips that cause excessive reframe conditions. A set of status leads also
provides a framing status output.
11.17 The output from the clock recovery circuit
clocks the signal into the elastic buffer, which is a
bank of eight 64-bit FIFO storage devices. The FIFO
bank holds two E1 frames. The E1 bit stream is
clocked into the center of the buffer by the write clock
and is clocked by the read clock out of the buffer to the
output line driver and line buildout (LBO) circuitry.
11.18 If the read and write clocks are at the same rate,
the data stays at the center of the buffer. However, if
the write clock is either faster or slower than the stable
read clock, the FIFO begins to fill to the left or right. As
the FIFO devices fill or empty to 128 bits, a lamp is lit,
and the slip warning status lead is activated.
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Issue 13: Mar 00
11.19 When the last FIFO device is full (256 bits or
one E1 frame), a frame slip indication is set and a
count started that triggers the excessive slip indication after eight slips. During the count, the frame
slip lamp stays lit, but the 128- and 192-bit slip
lamps are reset. The slip also activates the SLIP status lamp for 5 seconds.
Slip Monitoring
11.20 ESCIU cards provide bit slip (preslip) and
frame slip indications via front panel lamps and status data to local and remote monitoring systems. E1
failure (LOS), system reference, and bypass indications are also given.
11.21 At the frame slip point when the buffer is
filled, an uncontrolled slip occurs. However, no zeros
are transmitted downstream; thus, only a COFA
(change of frame alignment) may be detected by the
downstream device if the frame bit moves out from
the buffer in the receiving equipment.
11.22 If the on-line framer detects an LOS or OOF
condition in the E1 input, the ESCIU card transmits (if
optioned to do so) a framed all-ones signal at the reference rate to allow the downstream device to continue to
recover timing. An LOS or OOF condition also resets
the slip lamps and counter. The framer may be disabled
by an option switch. Disabling the framer allows unframed E1 signals to be passed by the ESCIU.
11.23 In the E1 B direction, the signal enters the
ESCIU card and is applied to the line interface and
clock recovery circuit. The data and recovered clock are
then fed directly to the line driver. No signal processing
occurs other than detecting the LOS conditions, which
are indicated with a status point and the bicolored E1
B lamp. Jitter is attenuated in the B direction.
E1 Bypass
11.24 Both A and B directions have bypass relays in
the event of a reference failure, card failure, power
loss, or if the ESCIU card is removed from the shelf.
11.25 The ESCIU card provides two types of bypass—
electronic and relay. If the input reference is lost, an
electronic bypass on the ESCIU card is activated. A
front panel jack is provided to allow manual activation
of the electronic bypass. A lit BYPASS lamp indicates
the electronic bypass is active.
Issue 13: Mar 00
11.26 An alarm is set when the electronic bypass is
active; this is the same as is set for E1 A (major, minor, or no alarm).
Caution: A relay bypass on the SCIU interface module is activated if the ESCIU
card fails, if dc power is lost, or if the
ESCIU card is removed from the shelf.
Slip Monitor Mode
11.27 ESCIU cards can monitor slips without synchronizing the signal. In the slip monitor mode, the
E1 A line interface acts as a bridging input. The connection to the E1 to be monitored must be made using a bridging unit available from Symmetricom.
The E1 A input is applied to the FIFO, where slip information is obtained and displayed as above. In the
slip monitor mode, E1 B is disabled.
12. PSM CARD DESCRIPTION
12.01 The PSM card monitors up to four external inputs. The PSM-E and PSM-EV5 cards monitor 2.048
Mb/s signals, the PSM-T and PSM-TV5 cards monitor
1.544 Mb/s signals, and the PSM-EA card monitors
2.048 Mb/s and 2.048 MHz signals. The number of
inputs scanned and the framing type can be changed
by TL1 commands from a remote PC or by switch
settings on the card (refer to the TL1 User’s Guide
for information on commands). An MIS card must be
installed in the system for communications with an
external computer.
TMSL 097-45230-01
stiffener in the middle of those slot pairs, which precludes a double-wide card.) The maximum number of
PSM cards is two in the master shelf and five in each
expansion shelf, with a limit of seven PSM cards in
any single system. The maximum number of Version
5 PSM cards allowed in a single system is limited
only to the number of available TO slots in the shelf.
12.05 The signals to be monitored are connected to
the same output panel used by the TO cards. The cables are connected to wire-wrap modules or 10-port
BNC interface modules mounted on the MMP, or the
wire-wrap panel.
12.06 The PSM card scans each enabled input plus
the two internal references to monitor transmission
and performance parameters. Each input is sampled
for 120 ms for a total elapsed sample time of approximately 1 second. The first 240 ms is ignored to ensure measurement stabilization. The sample rate for
all input signals is 1 Hz. Spans that are not enabled
are not checked. Scanning continues to cycle through
the active inputs while the card is powered.
12.07 The PSM card reports an event when the
transmission event count exceeds the assigned
threshold. The factory-set thresholds are as follows:
• Out of frame (OOF): 4
• Alarm indication signal (AIS): 4
• Bipolar violations (BPV): 16
• Cyclic Redundancy Check (CRC): 16
12.02 PSMV5 cards provide additional features
when used with an MISV5 card. The PSM card communicates with the MIS card, which allows the user
to control the card, and retrieve status and alarm information. To maintain MIS-to-PSM card communications, an MISV5 card must be installed when a
PSMV5 card is installed in the shelf.
12.03 The PSMV5 card works with the MISV5 card to
provide the user with status and alarm information
and allow the user to control the card. Refer to the
TL1 User’s Guide (provided with each MIS card) for
information on the TL1 commands associated with
the PSM cards.
12.04 PSM cards can be installed in any two adjacent TO slots in the master shelf except the
TO3/TO4 position. (This exception is due to the shelf
• Loss of signal (LOS): 1
12.08 The OOF and AIS counts represent the number of errored seconds for each event during the time
the PSM scans the input. The BPV and CRC counts
represent the actual number of errors counted while
the input is being scanned. All thresholds except
LOS are user-configurable, and the report given
when a threshold is exceeded can be changed from a
condition to an alarm.
12.09 Both the phase and frequency of the input signals are monitored in comparison to the active clock
card or clock input signal in the shelf. Calculations
are then made for MTIE and TDEV over various
time periods. The time periods and the factory-set
thresholds are listed in Table L.
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Issue 13: Mar 00
12.10 The monitored parameters and calculated values are stored in ninety-six 15 minute bins. The bins
are first-in, first-out (FIFO) so that when the 97th
interval is completed, the oldest stored 15 minute
data is overwritten. The data in these bins is the 1
minute averaged raw phase values, not the 1 second
data points. Therefore, a 15 minute bin will contain
15 data points.
Table L. PSM Card Factory Threshold Settings
for MTIE and TDEV
MTIE
THRESHOLD
(ns)
TDEV
THRESHOLD
(ns)
1
300
100
4
300
100
16
350
125
64
450
255
128
650
360
512
1,000
—
900
1,000
—
TIME
(s)
Note: The thresholds shown can be changed by
TL1 command.
12.11 Remote control via the MIS card may be performed. For detailed information on available parameters that can be remotely accessed, refer to the
TL1 User’s Guide (provided with each MIS card).
12.12 If an input has been disabled by switches on
the PSM card or by TL1 command, performance data
will not be collected on that input until that input is
enabled.
Page 52
12.13 If the PSM card is removed from the shelf, all
error counts and stability measurement data registers are set to zero. Also, all options set by command
will revert to the values set by switches on the PSM
card. A FAIL lamp on the front panel of the card
lights red if the self-diagnostic tests fail.
12.14 There is a separate front-panel REF lamp for
each reference source, and each lamp indicates the
status of the corresponding reference input. These
lamps light green when an input is enabled and has
passed error check. They light red when an input is
enabled and fails the error check (high CRC, OOF,
BPV, AIS, or LOS). The REF lamps do not light if the
associated input is not enabled.
12.15 There is a separate front-panel TOL lamp for
each reference source, and each lamp indicates the
stability of the corresponding reference input. These
lamps are off if the input is not enabled, and off if the
input is enabled and within stability tolerance. The
TOL lamps light yellow if the input is enabled and
out of stability tolerance as measured by MTIE and
TDEV.
12.16 The ST lamp on the front panel is off if no clock
cards are active. This lamp lights green if at least
one clock card is active.
12.17 The INP lamp is off if no clock cards or clock input cards are active, but lights green if at least one
clock card or clock input card is active.
13. SPECIFICATIONS
13.01 The DCD-523 System specifications are listed
in Table M. Table lists the bridging isolator specifications. Table O lists the individual card specifications. The specification terms are explained in
Table P.
Issue 13: Mar 00
TMSL 097-45230-01
Table M. System Specifications
ITEM
SPECIFICATION
CLOCK SUMMARY
Source
Holdover (0 h to 24 h @ 25 °C):
Holdover (0 h to 24 h
@ 0 °C to 45 °C):
Pull-in Range
Source
Holdover (0 h to 24 h, 25 °C):
Holdover (0 h to 24 h, 0 °C to 45 °C):
Pull-in Range
ST2E Clock
Rb Vapor Cell
±2.0 x 10–11
ST2
Rb Vapor Cell
±4.0 x 10–11
ST3E (Note)
TCXO
±3.0 x 10–10
±5.0 x 10–11
±1.6 x 10–8
±1.0 x 10–10
±1.6 x 10–8
±1.0 x 10–8
±5.6 x 10–6 or ±2.0 x 10–6
TNC-E Clock
Rb Vapor Cell
±2.0 x 10–11
±5.0 x 10–11
±1.6 x 10–8
TNC
TCXO
±3.0 x 10–10
±1.0 x 10–9
±0.75 x 10–6
LNC (Note)
TCXO
±3.0 x 10–10
±1.0 x 10–8
±5.6 x 10–6 or ±2.0 x 10–6
Note: Switch-selectable pull-in ranges
COMMUNICATIONS
See the MIS card section in Table O.
ALARM AND STATUS OUTPUTS
See the MIS or SAI card section in Table O.
SSM
E1 Quality Levels Supported
QL-DNU
QL-PRC
QL-SSUL
QL-NONE
QL-RES
QL-SSUT
QL-NORM
QL-SEC
QL-UNK
T1 Quality Levels Supported
QL-DUS
QL-PRS
QL-ST2
QL-ST4
QL-NONE
QL-RES
QL-ST3
QL-STU
QL-NORM
QL-SMC
QL-ST3E
QL-TNC
DELAYS
Persistence Delay
0 ms to 2000 ms, in 100 ms steps
Nonswitching Message Delay
0 ms to 2000 ms, in 100 ms steps
Switching Message Delay
0 ms to 2000 ms, in 100 ms steps
Holdover Message Delay
0 ms to 3600 s, in 1 s steps
Holdoff Delay
0 ms to 2000 ms, in 100 ms steps
Wait-to-Restore Delay
0 min to 15 min, in 1 min steps
Note: These delays can be set by TL1 command.
Page 53
TMSL 097-45230-01
Issue 13: Mar 00
Table M. System Specifications
ITEM
SPECIFICATION
POWER
Voltage
–42 V dc to –56 V dc
Shelf Current (Note)
1.5 A (For the first 30 min, the TNC-E and ST2E needs 4 A)
Shelf Fusing
5A
Recommended Shelf Source Fusing
7.5 A to 10 A
Note: Current specifications for fully loaded shelves.
PHYSICAL
Shelf Assembly (HxWxD)
Interface Panel (HxWxD):
Wire-wrap Panel
Modular Mounting Panel
262.9 mm x 584.2 mm x 279.4 mm (10.35 inches x 23.0 inches x 11.0
inches) (6 RU)
88.9 mm x 584.2 mm x 279.4 mm (3.5 inches x 23.0 inches x 11.0
inches) (2 RU)
133 mm x 584.2 mm x 279.4 mm (5.25 inches x 23.0 inches x 11.0
inches) (3 RU)
1-slot card (HxWxD)
152.4 mm x 19.1 mm x 244.34 mm + 6.35 mm (for latch) (6.0 inches x
0.75 inches x 9.625 inches + 0.25 inch [for latch])
2-slot card (HxWxD)
152.4 mm x 41.3 mm x 244.34 mm + 6.35 mm (for latch) (6.0 inches x
1.625 inches x 9.625 inches + 0.25 inch [for latch])
5-slot card (HxWxD)
152.4 mm x 95.5 mm x 244.34 mm + 6.35 mm (for latch) (6.0 inches x
4.0 inches x 9.625 inches + 0.25 inch [for latch])
Environmental
Operating Temperature
Operating Humidity
Page 54
0 °C to 45 °C
0% to 95%, noncondensing
Issue 13: Mar 00
TMSL 097-45230-01
Table N. Bridging Isolator Specifications
ITEM
SPECIFICATION
Impedance (Input and Output)
75 Ω (wire-wrap: 120 Ω)
Insertion Loss (Input to Output)
<0.01 dB @ 8 kHz
Bridging Insertion Loss
20.8 dB (wire-wrap: 20 dB)
Connector Type
(Note)
BNC (p/n 093-45030-01, 093-45030-31)
SMB (p/n 093-45030-02, 093-45030-32)
Siemens 1.6/5.6 (p/n 093-45030-03, 093-45030-33)
Siemens 1.0/2.3 (p/n 093-45030-35)
Wire-wrap (p/n 093-45030-04)
Dimensions (cm)
10.2 cm (4 in) x 4.4 cm (1.7 in) x 2.8 cm (1.1 in) (wire-wrap: 3.6 cm
[1.4 in] x 7.2 cm [2.8 in] x 84 cm [33 in])
Weight
60 g (2.1 oz) (wire-wrap: 25 g [0.88 oz])
Operating Temperature
–40 °C to +65 °C
Humidity
95% noncondensing
Note: Bridging isolators with a suffix -0x on the part number supply one bridged signal; bridging isolators with a
suffix -3x on the part number supply three bridged signals.
Page 55
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications
ITEM
SPECIFICATION
ACI CARD
Number of Inputs
1
Input Signal Type
2.048 MHz (ITU G.703, Table 10)
Analog 1.0 MHz, 5.0 MHz, and 10.0 MHz (tolerance ±50 ppm)
Input Signal Level
0.3 V to 1.5 V rms
Input Impedance
75 Ω unbalanced
Input Frequency (sine wave)
Switch-selectable: 10 MHz, 5 MHz, 2.048 MHz, 1 MHz
Clock Holdover
2 s with 0 phase shift
Transfer Time
2s
SSM Processing
No (SSM quality level can be assigned via version 5.04 or higher MISV5 card)
CI -EA CARD
Number of Inputs
1
Input Signal Type
Switch-selectable: Digital (ITU G.703, Table 6), or Analog (ITU G.703,
Table 10)
Input Signal Parameters Monitored
Loss of sync or AIS, OOF, COFA, and LOS
Input Error Threshold
One or more OOFs in 10 s; error rate 10–6 (based on code violations)
Framing Protocols
Switch-selectable: CAS or CCS framing with/without CRC-4 per ITU G.704
Line Coding
AMI or HDB3
Input Level, Terminated
1.0 V to 3.5 V base-to-peak (specific terminations are supported by separate
input modules)
Input Impedance
120 Ω balanced or 75 Ω unbalanced
Jitter Tolerance
Per ITU G.823 (Table 2)
SSM Processing
No (SSM quality level can be assigned via version 5.04 or higher MISV5 card)
Page 56
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
CI CARD
Number of Inputs
1
DS1 Input Signal Monitor
Loss of signal (LOS) or AIS, OOF, and COFA
Input Error Threshold
Error rate of 10–6 (based on BPV)
Framing Protocols
D4 /ESF
Input Signal Level, Terminated
1.0 V to 3.5 V base-to-peak, –10 dB up to 199 m (655 ft) from DSX
Input Signal Level, Bridged
0.1 V to 0.35 V base-to-peak, up to 199 m (655 ft) from DSX
Input Signal Impedance
100 Ω (T1) or 133 Ω (CC)
Input Signal Jitter Tolerance
10-unit intervals, peak-to-peak, 0 Hz to 310 Hz; 0.3-unit intervals, 10 kHz to
50 kHz
Input Format
64 kb/s all-ones, RTZ, 62.5% duty cycle, up to 455 m (1500 ft) from source
Input Level
1.5 V to 4.0 V base-to-peak
Input Impedance
100 Ω or 133 Ω balanced, 50 Ω unbalanced
SSM Processing
No (SSM quality level can be assigned via version 5.04 or higher MISV5 card)
DCIM-EA CARD
Number of Inputs
2
Input Signal Type
Digital: E1 (ITU G.703, Table 6)
2.048 MHz (ITU G.703, Table 10)
Input Parameters Monitored
CRC, OOF, BPV, AIS, and LOS (CRC and BPV monitored full-time in 15 min
bins)
Factory-set Thresholds (all
except LOS may be changed
by TL1 commands)
AIS: 1
BPV: 16
CRC: 16
LOS:1
OOF: 1
Framing Protocols
CAS or CCS framing with/without CRC-4 per ITU G.704 is selectable via TL1
command only
Line Coding
HDB3
Input Level, Terminated
1.0 V to 3.5 V base-to-peak
Input Level, Bridging
0.1 V to 0.35 V base-to-peak
Input Impedance
120 Ω balanced or 75 Ω unbalanced
Jitter Tolerance
Per ITU G.823 (Table 2)
SSM Processing
Yes
Page 57
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
DCIM-T CARD
Number of Inputs
2
Input Signal Type
DS1
Input Signal Parameters
Monitored
CRC, OOF, BPV, AIS, and LOS (CRC and BPV monitored full-time in 15 min
bins)
Factory-set Thresholds (all
except LOS may be changed
by TL1 commands)
AIS: 1
BPV: 16
CRC: 16
LOS:1
OOF: 1
Framing Protocols
D4 /ESF or autoframer, set by TL1 command
Line Coding
AMI or B8ZS
Input Signal Level, Terminated
1.0 V to 3.5 V base-to-peak
Input Signal Level, Bridged
0.1 V to 0.35 V base-to-peak
Input Signal Jitter Tolerance
10-unit intervals, peak-to-peak, 0-310 Hz; 0.3-unit intervals, 10 kHz to 50 kHz
(per Pub TA-TSY-000378)
Input Signal Impedance
100 Ω balanced or 50 Ω unbalanced
Input Frequency
1.544 Mb/s
SSM Processing
Yes
Page 58
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
MRC-EA CARD AND MRC-EAV5 CARD
Number of Inputs
4
Input Signal Type
Digital: E1 (ITU G.703, Table 6)
2.048 MHz (ITU G.703, Table 10)
Input Signal Priority
GPS (priority level 1), LORAN (priority level 2), Cesium (priority level 3), Network (priority level 4)
Input Parameters Monitored
CRC, OOF, BPV, AIS, and LOS
Factory-set Thresholds (all
except LOS may be changed
by TL1 commands)
AIS: 1
BPV: 16
CRC: 16
LOS:1
OOF: 1
Framing Protocols
CAS or CCS framing with/without CRC-4 per ITU G.704 is selectable via TL1
command only
Line Coding
HDB3
Input Level, Terminated
1.0 V to 3.5 V base-to-peak
Input Level, Bridging
0.1 V to 0.35 V base-to-peak
Input Impedance
120 Ω balanced or 75 Ω unbalanced
Jitter Tolerance
Per ITU G.823 (Table 2)
SSM Processing
MRC-EA: No
MRC-EAV5:No (SSM quality level can be assigned via version 5.04 or higher
MISV5 card)
Page 59
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
MRC-T CARD AND MRC-TV5 CARD
Number of Inputs
4
Input Signal Type
DS1
Input Signal Type and Priority
GPS (priority level 1), LORAN (priority level 2), Cesium (priority level 3), Network (priority level 4)
Input Signal Parameters
Monitored
CRC, OOF, BPV, AIS, and LOS
Factory-set Thresholds (all
except LOS may be changed
by TL1 commands)
CRC:16
OOF: 4
BPV: 16
AIS: 4
LOS:1
Framing Protocols
D4 /ESF or autoframer, set by TL1 command
Line Coding
AMI or B8ZS
Input Signal Level, Terminated
1.0 V to 3.5 V base-to-peak
Input Signal Level, Bridged
0.1 V to 0.35 V base-to-peak
Input Signal Jitter Tolerance
10-unit intervals, peak-to-peak, 0 Hz to 310 Hz; 0.3-unit intervals, 10 kHz to
50 kHz (per Pub TA-TSY-000378)
Input Signal Impedance
100 Ω balanced or 50 Ω unbalanced
Input Frequency
1.544 Mb/s
SSM Processing
MRC-T:
No
MRC-TV5: No (SSM quality level can be assigned via version 5.04 or higher
MISV5 card)
Page 60
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TNC-E AND ST2E CARDS (Refer to Table P for definitions of specification terms) (See Note)
Source
Rubidium atomic oscillator
Clock Holdover Stability:
0 h to 24 h, 25 °C
0 h to 24 h, 0 °C to 45 °C
30 days
±2 x 10–11
±5 x 10–11
±1 x 10–10
Accuracy (20 years)
1.0 x 10–9
Input Tolerance
±1.6 x 10–8
Pull-in Range
±1.6 x 10–8
Lock Range
±1 x 10–9
Allowable Reference Drift
(within 5 min)
±1 x 10–9
Convergence Time
≤1 h
Warm-up Time
≤30 min
Operating Temperature
0 °C to 45 °C
Industry Specifications
ITU G.812 transit node clock specifications for slave clocks
SSM Processing
No (SSM quality level can be assigned via version 5.04 or higher MISV5 card)
Note: When an ST2E Issue A or B card is in a shelf, use only an LPR for an input reference source. When an
ST2E Issue D (or later) card in a shelf, use either an LPR or network feed for an input reference source.
Page 61
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TNC CARD
Source
Oven-controlled crystal oscillator
Clock Holdover Stability:
0 h to 24 h, 25 °C
0 h to 24 h, 0 °C to 45 °C
30 days
±3.0 x 10–10
±1.0 x 10–9
±1.0 x 10–8
Accuracy (20 years)
1.0 x 10–6
Input Tolerance
±0.75 x 10–6
Pull-in Range
±0.75 x 10–6
Lock Range
±1.0 x 10–7
Convergence Time
≤1 h
Warm-up Time
30 min
Operating Temperature
0 °C to 45 °C
Industry Specifications
ITU G.812 transit node clock specifications for slave clocks and ETSI 3017
SSM Processing
No (SSM quality level can be assigned via version 5.04 or higher MISV5 card)
LNC CARD
Source
Oven-controlled crystal oscillator
Clock Holdover Stability:
0 h to 24 h, 25 °C
0 h to 24 h, 0 °C to 45 °C
30 days
±3.0 x 10–10
±1.0 x 10–8
±1.0 x 10–8
Accuracy (20 years)
1.0 x 10–6
Input Tolerance
±5.6 x 10–6 or ±2.0 x 10–6 (switch selectable)
Pull-in Range
±5.6 x 10–6 or ±2.0 x 10–6 (switch selectable)
Lock Range
±1.0 x 10–7
Convergence Time
≤1 h
Warm-up Time
≤30 min
Operating Temperature
0 °C to 45 ° C
SSM Processing
No (SSM quality level can be assigned via version 5.04 or higher MISV5 card)
Page 62
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
ST3E CARD
Source
Oven-controlled crystal oscillator
Clock Holdover Stability:
0 h to 24 h, 25 °C
0 h to 24 h, 0 °C to 45 °C
30 days
±3.0 x 10–10
±1.0 x 10–8
±1.0 x 10–8
Accuracy (20 years)
1.0 x 10–6
Input Tolerance
±5.6 x 10–6 or ±2.0 x 10–6 (switch selectable)
Pull-in Range
±5.6 x 10–6 or ±2.0 x 10–6 (switch selectable)
Lock Range
±1.0 x 10–7
Convergence Time
≤1 h
Warm-up Time
30 min
Operating Temperature
0 °C to 45 °C
SSM Processing
No (SSM quality level can be assigned via version 5.04 or higher MISV5 card)
EA10 CARD
Number of Outputs
10
Output Type
(switch-selectable on a per
port basis)
Digital E1 2.048 Mb/s (ITU G.703, Table 6) (any individual port)
or
2.048 MHz (ITU G.703, Table 10) (any individual port)
Waveform
Digital E1: 2.37 V ±10% (75 Ω); 3.0 V ±10% (120 Ω); Bipolar return to zero
(RTZ) per ITU G.703 Table 6
or
2.048 MHz: 75 Ω: 1.5 V peak maximum, 0.75 V peak minimum, 120 Ω: 1.9 V
peak maximum, 1.0 V peak minimum per ITU G.703, Table 10
Wave Shape
Digital E1: Rectangular, pulse width 244 ns ±25 ns, pulse interval 488 ns per
ITU G.703 (Figure 15)
or
Analog: Square wave per ITU G.703, Figure 21
Impedance
120 Ω balanced or 75 Ω unbalanced
Framing
CCS or CAS, with or without CRC-4
Protection
1:1, 1+1 (must use double-wide output module), or stand-alone
SSM Processing
No
Page 63
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
EA10M CARD
Number of Outputs
10
Output Type
(switch-selectable on a per
port basis)
Digital E1 2.048 Mb/s (ITU G.703, Table 6) (any individual port)
or
2.048 MHz (ITU G.703, Table 10) (any individual port)
Waveform
Digital E1: 2.37 V ±10% (75 Ω); 3.0 V ±10% (120 Ω); Bipolar return to zero
(RTZ) per ITU G.703 Table 6
or
2.048 MHz: 75 Ω: 1.5 V peak maximum, 0.75 V peak minimum, 120 Ω: 1.9 V
peak maximum, 1.0 V peak minimum per ITU G.703, Table 10
Wave Shape
Digital E1: Rectangular, pulse width 244 ns ±25 ns, pulse interval 488 ns per
ITU G.703 (Figure 15)
or
2.048 MHz: Square wave per ITU G.703, Figure 21
Impedance
120 Ω balanced or 75 Ω unbalanced
Framing
CCS or CAS, with or without CRC-4
Protection
1:1, 1+1 (must use double-wide output module), or stand-alone
SSM Processing
Yes
TOGA CARD
Number of Outputs
10
Output Type
2.048 MHz (ITU G.703, Table 10)
Waveform
75 Ω: 1.5 V peak maximum, 0.75 V peak minimum, 120 Ω: 1.9 V peak maximum, 1.0 V peak minimum per ITU G.703, Table 10
Wave Shape
Square wave per ITU G.703, Figure 21
Impedance
75 Ω unbalanced or 120 Ω balanced
Output Frequency
2.048 MHz
Protection
1+1 (must use double-wide output module), stand-alone, or 1:N
SSM Processing
No
Page 64
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOEA CARD
Number of Outputs
10
Output Type
Digital E1 2.048 Mb/s ±50 ppm
Waveform
2.37 V ±10% (75 Ω); 3.0 V ±10% (120 Ω); Bipolar return to zero (RTZ)
Wave Shape
Rectangular, pulse width 244 ns ±25 ns, pulse interval 488 ns per ITU G.703
(Figure 15)
Impedance
120 Ω balanced or 75 Ω unbalanced
Drive Capability
0 ft to 655 ft (0 m to 200 m) of twisted-pair, 0.643 mm (22 AWG) cable
Framing
CCS or CAS, with or without CRC-4
Protection
Stand-alone or 1:N
SSM Processing
No
TO-EA CARD, TO-EAN CARD, AND TO-EA5 CARD
Number of Outputs
10
Output Type
(switch-selectable on a per
port basis)
Digital E1 2.048 Mb/s (ITU G.703, Table 6) (any individual port)
or
2.048 MHz (ITU G.703, Table 10) (any individual port)
Waveform
Digital E1: 2.37 V ±10% (75 Ω); 3.0 V ±10% (120 Ω); Bipolar return to zero
(RTZ) per ITU G.703 Table 6
or
2.048 MHz: 75 Ω: 1.5 V peak maximum, 0.75 V peak minimum, 120 Ω: 1.9 V
peak maximum, 1.0 V peak minimum per ITU G.703, Table 10
Wave Shape
Digital E1: Rectangular, pulse width 244 ns ±25 ns, pulse interval 488 ns per
ITU G.703 (Figure 15)
or
2.048 MHz: Square wave per ITU G.703, Figure 21
Impedance
120 Ω balanced or 75 Ω unbalanced
Framing
CCS or CAS, with or without CRC-4
Protection
TO-EA5: Stand-alone or 1:1, 1+1 (must use double-wide output module)
TO-EA: Stand-alone or 1+1 (must use double-wide output module)
TO-EAN: Stand-alone or 1:N
SSM Processing
No
Page 65
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOAA CARD (090-40022-01, -02, -03, -05, -15, and 090-40028-10)
Number of Outputs
2
Output Type
Analog
Waveform
090-40022-01, -02, -03, -05, and 090-40028-10:
090-40022-15:
Wave Shape
Sine wave
Impedance
75 Ω unbalanced (50 Ω unbalanced for 090-40022-02)
Output Frequency
Switch-selectable
090-40022-01, -02:
090-40022-03:
090-40022-05, -15:
090-40028-10:
1 V rms
2 V rms
2.048 MHz, 1.0 MHz, 512 kHz, or
64 kHz
2.048 MHz, 1.0 MHz, 512 kHz, or
8 kHz
5 MHz
1 MHz, 5 MHz, or 10 MHz
Level Attenuators
090-40022-xx: 0 dB, 3 dB, 3.5 dB, 30 dB, 60 dB (none for 090-40028-10)
Protection
090-40022-xx: Stand-alone or 1:N
090-40028-10: Stand-alone
SSM Processing
No
TOCA CARD
Number of Outputs
10
Output Type
Composite clock (digital 64/8 kb/s)
Waveform
2.7 V to 3.5 V peak, 3 V nominal; bipolar RTZ; all-ones with BPV every eighth
pulse
Wave Shape
Rectangular, rise time <500 ns, pulse width 9.8 µs ±5%, pulse interval 15.6 µs
±5%
Impedance
133 Ω balanced
Duty Cycle
62.5%
Output Drive Capability
0 m to 910 m (0 ft to 3000 ft) of twisted-pair, 25.3 mils, 0.643 mm (22 AWG)
cable in the following lengths: 0 m to 455 m (0 ft to 1500 ft), 456 m to 606 m
(1501 ft to 2000 ft), 607 m to 758 m (2001 ft to 2500 ft), and 759 m to 910 m
(2501 ft to 3000 ft)
Switching
Provides hitless switching when used with 090-45230-03 Shelf
Protection
Stand-alone or 1:N
SSM Processing
No
Page 66
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOTA CARD AND TOTA-5 CARD
Number of Outputs
10
Output Type
DS1
Waveform
2.4 V to 3.6 V peak, 3.5 V nominal; bipolar return to zero; all-ones; ESF or D4
format
Wave Shape
Rectangular, rise time <150 ns, pulse width 350 ns ±50 ns, pulse interval
648 ns ±0.005%
Impedance
100 Ω balanced
Overshoot
To +20% and –45% of peak-to-base amplitude
Duty Cycle
50% nominal
Output Drive Capability
0 m to 199 m (0 ft to 655 ft) of twisted-pair, 25.3 mils, 0.643 mm (22 AWG)
ABAM cable
Switching
Provides hitless switching when used with 090-45230-03 Shelf (TOTA-5 card)
Protection
Stand-alone or 1:N
SSM Processing
No
TOTA-M CARD
Number of Outputs
10
Output Type
DS1
Waveform
2.4 V to 3.6 V peak, 3.5 V nominal; bipolar return to zero; all-ones; ESF or D4
format
Wave Shape
Rectangular, rise time <150 ns, pulse width 350 ns ±50 ns, pulse interval
648 ns ±0.005%
Impedance
100 Ω balanced
Overshoot
To +20% and –45% of peak-to-base amplitude
Duty Cycle
50% nominal
Output Drive Capability
0 m to 199 m (0 ft to 655 ft) of twisted-pair, 25.3 mils, 0.643 mm (22 AWG)
ABAM cable
Protection
Stand-alone or 1:N
SSM Processing
Yes
Page 67
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOLA 090-40023-01 CARD
Number of Outputs
5 RS-422 or 10 RS-423 (TTL)
Output Type
RS-422 or RS-423 (TTL)
Wave Amplitude
2 V to 6 V pp for RS-422 (balanced) into 100 Ω
>3 V for RS-423 (unbalanced) into 450 Ω
Wave Shape
Square wave
Impedance
100 Ω resistive, balanced; 450 Ω resistive, unbalanced
Data Rates (four frequency
groups)—From wire-wrap
panel
Group
0
1
2
3
Out 1
4 kb/s
256 kb/s
384 kb/s
1.544 Mb/s
Out 2
8 kb/s
512 kb/s
768 kb/s
1.544 Mb/s
Out 3
64 kb/s
2.048 Mb/s
1.536 Mb/s
1.544 Mb/s
Out 4
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Out 5
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Data Rates (four frequency
groups)—From DB9 connector
Group
0
1
2
3
Out 1
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Out 2
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Out 3
64 kb/s
2.048 Mb/s
1.536 Mb/s
1.544 Mb/s
Out 4
8 kb/s
512 kb/s
768 kb/s
1.544 Mb/s
Out 5
4 kb/s
256 kb/s
384 kb/s
1.544 Mb/s
Cable Lengths (maximum in
meters and feet; RS-422)
20.1 mils, 0.511 mm
(24 AWG) Twisted Pair
Data Rate
4 kb/s
8 kb/s
64 kb/s
256 kb/s
384 kb/s
Cable Lengths (maximum in
meters and feet; RS-423
[TTL]) 20.1 mils, 0.511 mm
(24 AWG) Twisted Pair
Data Rate
4 kb/s
8 kb/s
64 kb/s
100 kb/s
and above
Protection
Stand-alone or 1:N
SSM Processing
No
Page 68
Distance
1000 m (3275 ft)
1000 m (3275 ft)
1000 m (3275 ft)
400 m (1300 ft)
250 m (825 ft)
Distance
250 m (825 ft)
100 m (325 ft)
15 m (50 ft)
Not recommended
Data Rate
768 kb/s
1.536 Mb/s
1.544 Mb/s
2.048 Mb/s
Distance
120 m (400 ft)
70 m (225 ft)
70 m (225 ft)
50 m (150 ft)
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOLA 090-40023-02 CARD
Number of Outputs
5 RS-422 or 10 RS-423 (TTL)
Output Type
RS-422 or RS-423 (TTL)
Wave Amplitude
2 V to 6 V pp for RS-422 (balanced) into 100 Ω
>3 V for RS-423 (unbalanced) into 450 Ω
Wave Shape
Square wave
Impedance
100 Ω resistive, balanced; 450 Ω resistive, unbalanced
Data Rates (four frequency
groups)—From wire-wrap
panel
Group
0
1
2
3
Out 1
8 kb/s
256 kb/s
384 kb/s
1.544 Mb/s
Out 2
8 kb/s
512 kb/s
768 kb/s
1.544 Mb/s
Out 3
8 kb/s
2.048 Mb/s
1.536 Mb/s
1.544 Mb/s
Out 4
8 kb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Out 5
8 kb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Data Rates (four frequency
groups)—From DB9
connector
Group
0
1
2
3
Out 1
8 kb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Out 2
8 kb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Out 3
8 kb/s
2.048 Mb/s
1.536 Mb/s
1.544 Mb/s
Out 4
8 kb/s
512 kb/s
768 kb/s
1.544 Mb/s
Out 5
8 kb/s
256 kb/s
384 kb/s
1.544 Mb/s
Cable Lengths (maximum in
meters and feet; RS-422) 20.1
mils, 0.511 mm (24 AWG)
Twisted Pair
Data Rate
8 kb/s
256 kb/s
384 kb/s
512 kb/s
Distance
1000 m (3275 ft)
400 m (1300 ft)
250 m (825 ft)
200 m (650 ft)
Cable Lengths (maximum in
meters and feet; RS-423
[TTL]) 20.1 mils, 0.511 mm
(24 AWG) Twisted Pair
Data Rate
8 kb/s
≥100 kb/s
Distance
100 m (325 ft)
Not recommended
Protection
Stand-alone or 1:N
SSM Processing
No
Data Rate
768 kb/s
1.536 Mb/s
1.544 Mb/s
2.048 Mb/s
Distance
120 m (400 ft)
70 m (225 ft)
70 m (225 ft)
50 m (150 ft)
Page 69
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOLA 090-40023-03 CARD
Number of Outputs
5
Output Type
RS-232
Wave Amplitude
Greater than +3 V from GND and greater than –3 V from GND for RS-232 into
3 kΩ to 7 kΩ
Wave Shape
Square wave
Impedance
100 Ω resistive, balanced; 450 Ω resistive, unbalanced
Data Rates (four frequency
groups) - From wire-wrap
Module
Group
0
1
2
3
Cable Lengths (maximum in
meters and feet; RS-232) 20.1
mils, 0.511 mm (24 AWG)
Twisted Pair
Data Rate
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Protection
Stand-alone or 1:N
SSM Processing
No
Out 1
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Out 2
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Out 3
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Distance
15 m (50 ft)
15 m (50 ft)
15 m (50 ft)
Not recommended
TOLA 090-40023-04 CARD
Number of Outputs
5
Output Type
RS-422
Wave Amplitude
2 V to 6 V p-p for RS-422 (balanced) into 100 Ω
Wave Shape
Square wave
Impedance
100 Ω resistive, balanced
Data Rates
All data rates are 2.048 Mb/s
Cable Lengths (maximum in
meters and feet; RS-422)
20.1 mils, 0.511 mm
(24 AWG) Twisted Pair
Data Rate
2.048 Mb/s
Protection
Stand-alone or 1:N
SSM Processing
No
Page 70
Distance
50 m (150 ft)
Out 4
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Out 5
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOLA 090-40023-05 CARD
Number of Outputs
5 RS-422 or 10 RS-423 (TTL)
Output Type
RS-422 or RS-423 (TTL)
Wave Amplitude
2 V to 6 V p-p for RS-422 (balanced) into 100 Ω
>3 V for RS-423 (unbalanced) into 450 Ω
Wave Shape
Square wave
Impedance
100 Ω resistive, balanced; 450 Ω resistive, unbalanced
Data Rates (four frequency
groups)—From wire-wrap
panel
Group
0
1
2
3
Out 1
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Out 2
64 kb/s
64 kb/s
64 kb/s
64 kb/s
Out 3
128 kb/s
128 kb/s
128 kb/s
128 kb/s
Out 4
192 kb/s
192 kb/s
192 kb/s
192 kb/s
Out 5
1.024 Mb/s
1.024 Mb/s
1.024 Mb/s
1.024 Mb/s
Data Rates (four frequency
groups)—From DB9
connector
Group
0
1
2
3
Out 1
1.024 Mb/s
1.024 Mb/s
1.024 Mb/s
1.024 Mb/s
Out 2
192 kb/s
192 kb/s
192 kb/s
192 kb/s
Out 3
128 kb/s
128 kb/s
128 kb/s
128 kb/s
Out 4
64 kb/s
64 kb/s
64 kb/s
64 kb/s
Out 5
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
1.544 Mb/s
Cable Lengths (RS-422)
20.1 mils, 0.511 mm
(24 AWG) Twisted Pair (maximum in meters and feet)
Data Rate
64 kb/s
128 kb/s
192 kb/s
Distance
1000 m (3275 ft)
400 m (1300 ft)
400 m (1300 ft)
Cable Lengths (RS-423 [TTL])
20.1 mils, 0.511 mm
(24 AWG) Twisted Pair (maximum in meters and feet)
Data Rate
64 kb/s
≥100 kb/s
Distance
15.2 m (50 ft)
Not recommended
Protection
Stand-alone or 1:N
SSM Processing
No
Data Rate
1.024 Mb/s
1.544 Mb/s
Distance
91 m (300 ft)
70 m (225 ft)
Page 71
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOLA 090-40023-06 CARD
Number of Outputs
5 RS-422 or 10 RS-423 (TTL)
Output Type
RS-422 or RS-423 (TTL)
Wave Amplitude
2 V to 6 V p-p for RS-422 (balanced) into 100 Ω
>3 V for RS-423 (unbalanced) into 450 Ω
Wave Shape
Square wave
Impedance
100 Ω resistive, balanced; 450 Ω resistive, unbalanced
Data Rates (four frequency
groups)—From wire-wrap
panel or from DB9 connector
Group
0
1
2
3
RS-422 20.1 mils, 0.511 mm
(24 AWG) Twisted Pair (maximum in meters and feet)
Data Rate
≤56 kb/s
Distance
1000 m (3275 ft)
RS-423 (TTL) 20.1 mils,
0.511 mm (24 AWG) Twisted
Pair (maximum in meters and
feet)
Data Rate
4 kb/s
8 kb/s
56 kb/s
Distance
250 m (825 ft)
100 m (325 ft)
15 m (50 ft)
Protection
Stand-alone or 1:N
SSM Processing
No
Page 72
Out 1
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Out 2
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Out 3
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Out 4
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Out 5
4.8 kb/s
9.6 kb/s
19.2 kb/s
56 kb/s
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
TOLA 090-40023-07 CARD
Number of Outputs
5 RS-422 or 10 RS-423 (TTL)
Output Type
RS-422 or RS-423 (TTL)
Wave Amplitude
2 V to 6 V p-p for RS-422 (balanced) into 100 Ω
>3 V for RS-423 (unbalanced) into 450 Ω
Wave Shape
Square wave
Impedance
100 Ω resistive, balanced; 450 Ω resistive, unbalanced
Data Rates (four frequency
groups)—From wire-wrap
panel or from DB9 connector
Group
0
1
2
3
RS-422 20.1 mils, 0.511 mm
(24 AWG) Twisted Pair (maximum in meters and feet)
Data Rate
256 kb/s
512 kb/s
Distance
400 m (1300 ft)
200 m (650 ft)
RS-423 (TTL) 20.1 mils,
0.511 mm (24 AWG) Twisted
Pair (maximum in meters and
feet)
Data Rate
≥100 kb/s
Distance
Not recommended
Protection
Stand-alone or 1:N
SSM Processing
No
Out 1
2048 kb/s
1024 kb/s
512 kb/s
256 kb/s
Out 2
2048 kb/s
1024 kb/s
512 kb/s
256 kb/s
Out 3
2048 kb/s
1024 kb/s
512 kb/s
256 kb/s
Data Rate
1.024 Mb/s
2.048 Mb/s
Out 4
2048 kb/s
1024 kb/s
512 kb/s
256 kb/s
Out 5
2048 kb/s
1024 kb/s
512 kb/s
256 kb/s
Distance
91 m (300 ft)
50 m (150 ft)
TOTL CARD
Number of Outputs
10
Output Type
DS1
Waveform
2.4 V to 3.6 V peak, 3.5 V nominal; bipolar return to zero, all-ones; ESF or D4
format
Wave Shape
Rectangular, rise time <150 ns, pulse width 350 ns ±50 ns, pulse interval
648 ns ±0.005%
Impedance
100 Ω balanced
Overshoot
Peak-to-base A +20% and –45%
Duty Cycle
50% nominal
Output Drive Capability
0 m to 198.7 m (0 ft to 655 ft) of twisted-pair, 25.3 mils, 0.643 mm (22 AWG)
ABAM cable
Protection
Stand-alone or 1:N
SSM Processing
No
Page 73
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
ESCIU CARD
Input
Bidirectional E1
E1 Input, A and B
Framed E1 2.048 Mb/s
Input Monitor
LOS or AIS, OOF
Input Error Threshold
2 out of 4 OOF, 32 consecutive zeroes
Framing Protocols
CAS, CCS; with or without HDB3 or AMI line coding
Input Signal Level, Terminated
2.375 V ±10% into 75 Ω (per ITU G.703)
Input Signal Level, Bridging
Bridging resistance is ≤422 Ω x 2 (20 dB)
Input Signal Level, Impedance
75 Ω unbalanced
Input Signal Level, Jitter Tolerance
Meets ITU G.823 requirements
E1 Output, Levels A and B
Meets ITU G.703 requirements
E1 A Buffer Size
±256 bits (± 1 frame)
E1 A Buffer Hysteresis
64 bits, approximately 40 µs
E1 A Through Delay
≥16 µs, 136 µs centered, ≤266 µs (2 E1 frames + 16 µs)
E1 B Through Delay
Nominal 16 µs
Protection
Stand-alone
SSM Processing
No
Page 74
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
SCIU CARD
Input
Bidirectional DS1
DS1 Input, A and B
Message DS1 1.544 Mb/s (framed or unframed)
Input Monitor
LOS or AIS, OOF
Input Error Threshold
2 out of 4 OOF, 32 consecutive zeroes
Framing Protocols
D4, ESF; with or without B8ZS or AMI
Input Signal Level, Terminated
1.5 V to 4.5 V base-to-peak (DSX-1)
Input Signal Level, Bridging
0.15 V to 0.45 V base-to-peak
Impedance
100 Ω balanced
Input Signal Level,
Jitter Tolerance
10 UI p-p, 0.31 to 10 kHz; 0.3 UI p-p, 10 to 100 kHz (per T1.102)
DS1 Output, Levels A and B
3 V base-to-peak nominal before line build-out preemphasis (per ANSI T1.1021988)
DS1 Output Impedance
100 Ω
Residual Jitter Output, DS1 A
0.025 UI with rubidium clock source; 0.1 UI with quartz clock source, 0.05 kHz
to 100 kHz
DS1 A Buffer Size
±192 bits (±1 frame)
DS1 A Buffer Hysteresis
64 bits, approximately 40 µs
DS1 A Through Delay
Nominal 125 µs; ≤250 µs
DS1 B Through Delay
Nominal 2.6 µs; ≤5.2 µs
Protection
Stand-alone
SSM Processing
No
Page 75
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
PSM-E CARD AND PSM-EV5 CARD
Number of Inputs
4
Input Signal Type
E1 Digital (ITU G.703, Table 6)
Input Impedance
120 Ω balanced or 75 Ω unbalanced
Input Parameters Monitored
CRC, OOF, BPV, AIS, LOS, MTIE, TDEV, raw phase
Factory-set Thresholds (all
except LOS may be changed
by TL1 commands)
AIS: 1
BPV: 16
CRC: 16
LOS:1
OOF: 1
Framing Protocols
CAS and CCS framing with/without CRC-4 per ITU G.704, unframed
Line Coding
HDB3
Scan Rate
5 s per active channel (inactive channels are not scanned)
Sample Rate
1 Hz per channel
Input Signal Level, Terminated
1.0 V to 3.5 V base-to-peak
Input Signal Level, Bridged
0.1 V to 0.35 V base-to-peak
Protection
Stand-alone
SSM Processing
No
Page 76
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
PSM-EAV5 CARD
Number of Inputs
4
Input Signal Type
Digital (ITU G.703, Table 6)
2.048 MHz (ITU G.703, Table 10)
Input Impedance
120 Ω balanced or 75 Ω unbalanced
Input Parameters Monitored
CRC, OOF, BPV, AIS, LOS, MTIE, TDEV, raw phase
Factory-set Thresholds (all
except LOS may be changed
by TL1 commands)
AIS: 1
BPV: 16
CRC: 16
LOS:1
OOF: 1
Framing Protocols
CAS and CCS framing with/without CRC-4 per ITU G.704, unframed
Line Coding
HDB3
Scan Rate
5 s per active channel (inactive channels are not scanned)
Sample Rate
1 Hz per channel
Input Signal Level, Terminated
1.0 V to 3.5 V base-to-peak
Input Signal Level, Bridged
0.1 V to 0.35 V base-to-peak
Protection
Stand-alone
SSM Processing
No
Page 77
TMSL 097-45230-01
Issue 13: Mar 00
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
PSM-T CARD AND PSM-TV5 CARD
Number of Inputs
4
Input Signal Type
DS1
Input Impedance
120 Ω balanced
Input Parameters Monitored
CRC, OOF, BPV, AIS, LOS, MTIE, TDEV, raw phase
Factory-set Thresholds (all
except LOS may be changed
by TL1 commands)
CRC:16
OOF: 4
BPV: 16
AIS: 4
LOS:1
Framing Protocols
ESF or D4
Line Coding
AMI, B8ZS
Scan Rate
5 s per active channel (inactive channels are not scanned)
Sample Rate
1 Hz per channel
Input Signal Level, Terminated
1.0 V to 3.5 V base-to-peak
Input Signal Level, Bridged
0.1 V to 0.35 V base-to-peak
Protection
Stand-alone
SSM Processing
No
SAI CARD
Relay Contact Ratings
2 A, resistive load
Audible and Visual Alarms
(major and minor)
Normally open and normally closed contacts
Alarm Status Indication
(major and minor)
Normally open contacts
Status Leads
Open collector PNP, 120 V, 50 mA nominal, ≤500 mA; E2A, TASC type alarm
points (RTN [Return] lead at ground; active lead 5 Ω to 7 Ω from ground when
activated)
Page 78
Issue 13: Mar 00
TMSL 097-45230-01
Table O. Card Specifications (Contd)
ITEM
SPECIFICATION
MIS CARD AND MISV5 CARD
Relay Contact Ratings
2 A, resistive load
Audible and Visual Alarms
(major, minor, and critical)
Normally open and normally closed contacts
Alarm Status Indication
(major, minor, and critical)
Normally open contacts
Status Leads
Open collector PNP, 120 V, 50 mA nominal, ð500 mA; E2A, TASC type alarm
points (RTN [Return] lead at ground; active lead 5 Ω to 7 Ω from ground when
activated)
Physical Interface
Backplane
MIS Card Front Panel
DB9
RJ45
Electrical Interface (All Ports)
RS-232C
Configuration (All Ports)
Data communications equipment (DCE)
Language (All Ports)
TL1
Communications Settings
COMM1
COMM2
COMM3
9600 or 1200 baud
(set by TL1 command)
9600 or 1200 baud
(set by card switch)
9600 or 1200 baud
(set by TL1 command)
8 data bits
8 data bits
8 data bits
even, odd, or no parity
(set by TL1 command)
even, odd, or no parity
(set by card switch)
even, odd, or no parity
(set by TL1 command)
1 stop bit
1 stop bit
1 stop bit
Notes:
1. Settings are the same for COM2 or the RJ45 front-panel jack.
2. Either COM2 or the RJ45 front-panel jack are active, not both.
3. For additional communications settings, see the commands in the MIS card
TL1 User’s Guide.
Page 79
TMSL 097-45230-01
Issue 13: Mar 00
Table P. Specification Terms
TERM
MEANING
Accuracy (20 years)
(As used here, refers
only to frequency
accuracy, not time
accuracy)
Represents the degree to which the measured frequency characteristics of an oscillator, that is not influenced by a reference signal or control circuitry, conforms to a
defined value. For example, a 1 MHz signal that has an accuracy of 1 part in 10–6
can deviate ±1 Hz from 1,000,000 Hz.
Convergence Time
The time required to bring the local oscillator within 10–10 of the reference signal.
Holdoff Delay
The amount of time from when transmission impairments are detected on an input
until the input is disqualified.
Holdover Message
Delay
The amount of time from when the clocks go into holdover until the holdover SSM is
sent to the timing output cards.
Holdover Stability
Specifies the rate at which a clock, which is no longer influenced by a reference signal, changes from its nominal frequency over a certain period of time (e.g., 24 hours,
48 hours). (Stability is broadly categorized into short and long term periods. Short
term stability is dominated by random noise and jitter, whereas long term stability is
dominated by drift.)
Input Tolerance
The amount by which the input reference signal can change with respect to the average of the sampled input signal over the last 24 hours. If the input signal changes by a
value greater than this specified limit, the clock will declare an alarm and enter a holdover mode.
Lock Range
Represents the frequency difference between the current input signal sample value
and the center frequency lock value of the clock for which locking is possible.
Nonswitching Message
Delay
The amount of time from a signal quality SSM change (following the persistence
delay and which does not require a switch or rearrangement) at an input until the
new SSM is sent to the timing output cards.
Operating Temperature
The temperature range over which the specifications are met unless specifically
stated otherwise.
Persistence Delay
The amount of time from an SSM change at an input until the new SSM is sent to the
MIS card.
Pull-in Range
The largest offset between the actual input reference frequency and the nominal reference frequency within which the slave clock will always lock.
Wait-to-Restore Delay
The amount of time from when the input is free of transmission impairments until the
input is requalified for use on a DCIM card.
Storage Temperature
The temperature range over which the card can be stored without damage.
Switching Message
Delay
The amount of time from a signal quality SSM change (following the persistence
delay and which requires a switch or rearrangement) at an input until the new SSM is
sent to the timing output cards.
Warm-up Time
The time required to stabilize the temperature-regulating element surrounding the
oscillator.
Page 80
80 Pages
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