RFL Communications plc
Utility Network Specialists
SMX3 / 21 Sub-MUX
X.21 / V.24 Dual-Protocol sub-rate multiplexer
User Manual
Issue 1.4
Contents
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Issue
1.0
1.2
1.3
1.4
Introduction............................................................................................................ 3
Features ................................................................................................................ 3
Concatenation and Network Timing ...................................................................... 4
Equipment Layout ................................................................................................. 4
Channel Characteristics ........................................................................................ 5
X.21 Aggregate Port.............................................................................................. 6
Concatenation Port................................................................................................ 8
X.21 Data Port (Channel A)................................................................................. 10
V.24 Data Ports (Channels B & C) ...................................................................... 11
DIP Switches ....................................................................................................... 13
LEDs.................................................................................................................... 18
Power Input ......................................................................................................... 19
Alarms ................................................................................................................. 19
Example Configurations ...................................................................................... 20
Blank Setting Table ............................................................................................. 22
Comments
Draft issue
Initial Release
Applicable Firmware release smx-2-1-0-1.mcs
Example configurations added, timing details expanded
Loopback schematics added
RFL SMX3 / 21
User Manual
Page 2 of 22
Date
19 February 2009
04 March 2009
07 May 2009
08 June 2009
Issue 1.4
08 June 2009
1.
Introduction
Prompted by SP Powersystems’ operational requirements in the former MANWEB
region, RFL developed a four channel sub-multiplexer to support operation of their
MPR – LZPK102 protection relays and SCADA systems over leased digital circuits.
The requirements for this multiplexer is described in SMX3/40 Sub-MUX X.21 High
speed sub-rate multiplexer User Manual Release 2.01.
This new Dual-Protocol version, SMX3/21, is designed to support protection relays
with an X.21 serial interface rather than a V.24 interface, together with two V.24
channels (typically used for RS232) that can be used for the existing SCADA
equipment.
2.
Features
The RFL SMX3/21 Sub-MUX is a hardened (EATS 48-5) sub-rate multiplexer. The
equipment is 19” rack mountable, 1U high, with reversible mounting brackets
permitting either the connectors or the LEDs to face the front of the rack.
SMX3/21 aggregates one X.21 data channel (Channel A) and two V.24 data
channels (Channel B & Channel C) across a single point to point X.21 service. Data
Channel A is permanently allocated to Aggregate Channel 1. The V.24 Data
Channels B and C may both be assigned to either Aggregate Channel 2 or
Aggregate Channel 3. Both V.24 channels may be assigned to a single aggregate
channel; this feature is useful for supporting SCADA systems where multiple
terminals are attached.
LEDs are provided for Power Supply healthy and for the status of all ports. Two volt
free alarm changeover contacts are provided for Power and Aggregate
Communications healthy.
Ch. A
Port
X.21
RFL SMX3 / 21
User Manual
X.21
Port
Concat.
Port
Agg.Channel 3
Agg.Channel 2
BT KiloStream or similar
Optional Aggregate Concatenation
Ch. B
Port
V24
V24
Channel C
Port
assignment
& sharing
V24
Channel B
X.21 Channel A
Agg.Channel 1
MUX
Ch. C
Port
V24
Page 3 of 22
SMX3 / 21
Block Diagram
Issue 1.4
08 June 2009
3.
Concatenation and Network Timing
SMX3/21 will operate on a network of concatenated X.21 links. A facility is provided
so that two co-located SMX3/21 (i.e. one at each end of separate X.21 links) units
can be linked ‘back to back’. This feature is referred to as Aggregate Concatenation.
In this case the units may be configured so that the data on Channel A and / or
Channel B is re-transmitted onto a second point to point link at the aggregate level
via the Concatenation Port. For this to operate all links must be synchronised to the
network master timing signal. If any link within the network is unsynchronised (e.g. a
single radio link), SMX3/21 provides the option to output master network clock
signals to otherwise unsynchronised links.
An alternative option is to concatenate a single data channel at V.24 level by daisychaining the V.24 data links. This is referred to as Data Channel Concatenation. In
this case each X.21 link may be free-running (unsynchronised).
4.
Equipment Layout
RFL SMX3 / 21
User Manual
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Issue 1.4
08 June 2009
5.
Channel Characteristics
The maximum bandwidth that may be configured for Data Channel A (X.21) is a
function of the speed of the aggregate.
The sample rates for Aggregate Channels 2 & 3 are also a function of the aggregate
speed; thus the maximum baud rate that can be configured for Data Channels B & C
are a function of both the aggregate speed and the aggregate channel to which they
are assigned. The range of baud rate settings remains the same regardless of
aggregate speed.
Data Channel Aggregate Speed
Channel A
(X.21)
Sample Rate
Channel B or C
(V.24) assigned
to Agg. Ch 3
16k
Baud Rate range
(Async Mode)
Baud Rate range
(Transparent Mode)
Baud Rate range
(Async Mode)
Baud Rate range
(Transparent Mode)
128kbit/s
192kbit/s
64
Bandwidth kbit/s
Sample Rate
Channel B or C
(V.24) assigned
to Agg. Ch 2
64kbit/s
32k
256kbit/s
64 or 128
48k
64k
1200 - 9600
4800
9600
19200
38400
8k
16k
24k
32k
1200 4800
2400
1200 - 9600
4800
9600
19200
Transparent Mode is a high speed configuration for the V.24 ports particularly suited
to applications for protection relays. The end to end delay in this mode is less than
0.5s (excluding delays introduced by the comms link).
RFL SMX3 / 21
User Manual
Page 5 of 22
Issue 1.4
08 June 2009
6.
X.21 Aggregate Port
The X.21 port is a DB15 male connector; this is connected internally to a header on
the PCB using a ribbon cable. The X.21 port may be configured as DTE or DCE by
fitting the ribbon cable to the appropriate X.21 Port Header, and by selecting settings
on DIP switch 5. Note: DTE is the standard configuration, and is used in all
applications where the network provides the signal timing.
Transceivers are specified to ± 15kV IEC1000-4-2 air discharge ESD protection and
port connections are additionally protected by Tranzorb type arrays.
This port carries an aggregate of three bi-directional data channels; one X.21
channel and two V.24 channels.
X.21 (DTE)
X.21
X.21 (DCE)
Headers connected
to X.21 Port
V24
Standard header location
DCE header location only
used when SMX3/40
provides signal timing
X.21 header locations
Standard X.21 Port Pin-out (when in DTE configuration) – D15M on chassis
Circuit
T
R
C
I
S
G
X
Pin A
Pin B
Transmit Data
Receive Data
Control
Indication
Signal Element
Timing
Ground
2
4
3
5
6
9
11
10
12
13
8
15
Signal Element
Timing
7
14
Direction
Output
Input
Output
Input
Input
Output
Screen / Drain
RFL SMX3 / 21
User Manual
Notes
Permanently on
Signal ignored
Timing signal derived from
the network
Timing signal transmitted to
network (X). Special applications
only. Requires to be enabled
using mode DTE + Timing X
enabled
Must be earthed to shell
Page 6 of 22
Issue 1.4
08 June 2009
The DCE configuration may be used in specific circumstances where signal timing
from the network timing is unavailable (e.g. when used with a radio link that does not
provide a clock source). Two alternatives are:
The timing source is derived from a co-located unit that is itself deriving the
master clock signal from the network. The two units are interconnected via the
concatenation link (refer to following section. In this case Clock Source must be
configured to Concat Port.
The timing source is derived from within the unit; in this case the Clock
Source must be configured to Master.
In both cases the timing signal is output on pins 6 and 13.
Optional X.21 Port Pin-out (when in DCE configuration) – D15M on chassis
Circuit
Pin A
Pin B
T
R
C
I
S
Transmit Data
Receive Data
Control
Indication
Signal Element
Timing
2
4
3
5
6
9
11
10
12
13
G
Ground
Screen / Drain
8
15
Direction
Input
Output
Input
Output
Output
Notes
Signal ignored
Permanently on
Timing signal derived from
the port and transmitted to
network
Must be earthed to shell
In either configuration, use 6 pair plus ground stranded cable with overall shield
(eg RS 111-8994).
Maximum recommended length in substations - 10m (Check Utility standards).
DIP switches provide configuration options, see section 10.
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08 June 2009
7.
Concatenation Port
The Concatenation Port provides optional direct connection to a co-located SMX3/21
that is serving another X.21 link. Unless interrupted by a particular V.24 port setting,
aggregate channel data passes between this port and the X.21 port. This port has
the same capacity as the X.21 Port. Signal timing is always transferred across the
Concatenation port when the port mode is set to ‘Enabled as Concatenation’.
The Concatenation Port is a DB15 female connector; this is connected internally to a
header on the PCB using a ribbon cable. The Concatenation Port may be configured
as DTE or DCE by fitting the ribbon cable to the appropriate X.21 Port Header, and
by selecting settings on DIP switch 5. Note: DTE is the standard header location
used for Aggregate Concatenation i.e. direct connection to a co-located
SMX3/21.
Transceivers are specified to ± 15kV IEC1000-4-2 air discharge ESD protection and
port connections are additionally protected by Tranzorb type arrays.
CONC. (DCE)
Headers connected
to X.21 Port
Header location used for
Aggregate Concatenation
Headers connected
to Concatenation
Port
V24
X.21
CONC. (DTE)
Concatenation header locations
Aggregate Concatenation
Aggregate Concatenation is the interconnection at aggregate level of two co-located
SMX3/21 units. For this function the Concatenation Port is configured as Enabled as
Concatenation mode, (i.e. DTE with Timing X enabled). The timing signal is derived
from the port and is transmitted on pins 7 and 14 (Xa and Xb).
In installations where the X.21 aggregate that is connected to each co-located unit
receives timing from the network master clock, the clock source for both units should
be configured as X.21 Port.
In installations where the X.21 aggregate that is connected to one or both co-located
units do not receive timing from the network, the source of the timing signal must be
determined and the clock source for each unit should be configured as X.21 Port,
Concat Port or Master as appropriate (refer to DIP Switch 6 settings).
DIP switches provide configuration options, see section 10.
RFL SMX3 / 21
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Page 8 of 22
Issue 1.4
08 June 2009
Standard Concatenation Port Pin-out (DTE configuration)
as used for Aggregate Concatenation - D15F on chassis
Circuit
Pin A
Pin B
Transmit Data
Receive Data
Signal Element
Timing
Ground
Signal Element
Timing
2
4
6
9
11
13
Output
Input
Input
8
7
15
14
Output
Timing signal derived from the
port and transmitted to network.
C
Control
3
10
Output
I
Indication
5
12
Input
Permanently on. Not used
Aggregate Concatenation
Signal ignored. Not used
Aggregate Concatenation
T
R
S
G
X
Direction
Screen / Drain
Notes
Timing signal derived from the
network
in
in
Must be earthed to shell
Aggregate Concatenation to a co-located SMX3/21 requires a five twisted pair crossover cable with overall shield (eg RS 111-8988). Maximum recommended length
10m (check Utility standards).
Aggregate Concatenation Cable
D15M – D15M
Pair
Pin
A
B
A
B
A
B
A
B
A
B
1
2
3
4
5
Screen / Drain
End 1
End 2
2
4
9
11
4
2
11
9
6
7
13
14
7
6
14
13
8
8
15
15
Must be earthed to
connector shells at
both ends
The following table is for information only, and is not used in any standard configurations.
Optional Concatenation Port Pin-out (when in DCE configuration) – D15F on chassis
Circuit
Pin A
Pin B
T
R
C
I
S
Transmit Data
Receive Data
Control
Indication
Signal Element
Timing
2
4
3
5
6
9
11
10
12
13
G
Ground
Screen / Drain
8
15
RFL SMX3 / 21
User Manual
Direction
Input
Output
Input
Output
Output
Notes
Signal ignored
Permanently on
Timing signal derived from
the port and transmitted to
network
Must be earthed to shell
Page 9 of 22
Issue 1.4
08 June 2009
8.
X.21 Data Port (Channel A)
The port for Channel A is a DB15 female connector; it is configured as DCE.
Channel A Port Pin-out – D15F on chassis (DCE)
Circuit
T
R
C
I
S
G
Transmit Data
Receive Data
Control
Indication
Signal Element
Timing
Ground
Screen / Drain
Pin A
Pin B
2
4
3
5
6
9
11
10
12
13
8
15
Direction
Input
Output
Input
Output
Output
Notes
see Note below
See Note below
Timing signal transmitted
to network
Must be earthed to shell
Transceivers are specified to ± 15kV IEC1000-4-2 air discharge ESD protection and
port connections are additionally protected by Tranzorb type arrays.
Data received at the Channel A port is always terminated; it cannot be concatenated
across the concatenation link.
S is normally synchronised to network timing but in the event of this being
unavailable runs from an internal source within the SMX.
Note:
When DIP SW 1-2 is set to Local, I is ON when the channel is legally configured, the
aggregate is running and in sync, in which case C is ignored
When DIP SW 1-2 is set to Remote, I is ON when the channel is legally configured,
the aggregate is running and in sync, and C is received from the remote end.
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9.
V.24 Data Ports (Channels B & C)
Ports B and C are DCE ports on DB9 female connectors for asynchronous data:
Channels B & C Ports Pin-out – D9F on chassis (DCE)
Circuit
Pin
Direction
TxD
Transmit Data
3
Input
RxD
Receive Data
2
Output
RTS
Request to Send
7
Input
CTS
Clear to Send
8
Output
DCD
Data Carrier Detect
1
Output
DTR
Data Terminal Ready
4
Input
DSR
Data Set Ready
6
Output
RI
Ring Indicator
9
Output
SG
Signal Ground
5
Screen / Drain must be connected to the connector Shell
RI is permanently OFF.
DSR is ON when aggregate framing is synchronised.
DTR is ignored.
RTS turns on remote DCD and local CTS after a delay.
Transceivers are specified to ± 15kV IEC1000-4-2 air discharge ESD protection and
port connections are additionally protected by Tranzorb type arrays.
DIP switches provide configure options for each port, see section 10.
V.24 Port Sharing
There are two methods by which multiple V.24 ports can be assigned to an
aggregate channel:
Channels (ports) B and C within an SMX3/21 unit are assignable to
Aggregate Channels 2 and / or 3.
Where two SMX3s are co-located and interconnected via the concatenation
ports, it is possible for each of Channels B & C to be selected to communicate
over either via X.21 aggregate channel or the concatenation port in which
cases the channel terminates within the SMX3/21, via both ports, for daisychain applications via a co-located SMX3/21.
Where multiple V.24 ports are assigned to a channel (on one or multiple
SMX3/21 units), data from the channel is presented at RxD of all ports other
than the source of the data, and data to the channel is an ‘or’ function of TxD
of those ports where RTS is asserted ON. It is important therefore that
equipment connected in this way, such as a SCADA system, has the selfdiscipline for only one to be transmitting at any time.
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V.24 Data Channel Concatenation
SMX3/21 units co-located at one end of adjacent unsynchronised links may be
concatenated at the V.24 level either through the connected equipment, or directly
using a crossed RS232 data cable.
V.24 Port Performance
V.24 circuits operate to emulate a modem:
CTS follows the state of local RTS after any necessary delay, when the
Aggregate is working and in synchronism.
DCD follows the state of remote RTS when the Aggregate is working and in
synchronism.
DTR is ignored and can be left unconnected, the sub-multiplexer assumes a
continuous ON state.
DSR is ON when the Aggregate is working an in synchronism.
RI is unconnected or permanently OFF.
When RTS turns ON, CTS turns ON when it can be assured that data presented at
TxD will reach RxD at a remote end after DCD there has turned ON. This does not
exceed 10 ms.
It is possible to configure each port to limit the duration of the effect of RTS to protect
a SCADA system from an RTU which fails to turn RTS off after it has sent a
response. When enabled, by DIP switch (SW 6-1 and 6-2), if RTS remains ON for
longer than 2 seconds, its effect is terminated and its ON condition is not recognised
again until it has been OFF for longer than 2 seconds.
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X.21
10. DIP Switches
SW 6
SW 5
SW 4
SW 3
SW 2
OFF
1 - ON
SW 1
V24
Pos’n 1
1 = ON
Pos’n 8
DIP Switch Locations
Dip Switch functions
SW1
SW2
SW3
SW4
SW5
SW6
Channel A
X.21 Data
configuration
Channel B
V.24 Data
configuration
Channel C
V.24 Data
configuration
Not used
Aggregate &
Concatenation
enabling
Clock and
Timing
configuration
Setting data is in the following tables.
Refer to Section 14 for example configurations.
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DIP Switch 1 settings:
SW 1 X.21 Data Channel A Configuration
8
Bandwidth
00 = 64K
7
6
Not
Used
5
Always
set to 0
4
Not
Used
3
2
Local Loop
0= Off
1= On
(Test only)
01 = 128K
1
Indicate
0= Local
Port Enable
0= Off
1= Remote
1= Enabled
10 = Not Used
11 = Not Used
(See Note
Section 8)
• Bandwidth
Set to 64kbit/s, or 128kbit/s if permitted by the speed of the aggregate (refer to table in
section 5).
• Local Loop Off / On.
Normally set to Off
When set to On, data transmitted into of the MUX TxD is looped back to its RxD output.
Channel A requires the clock to be present; as this is a DCE port the clock is sourced
from the MUX; provided this is present local loop operation is always possible.
SMX3-21
Data Channels
A
RxD
X.21 Aggregate Channel
c
MUX
DCE
B
TxD
C
• Indicate
When set to Local, I is ON when the channel is legally configured, the aggregate is
running and in sync, in which case C is ignored
When set to Remote, I is ON when the channel is legally configured, the aggregate is
running and in sync, and C is received from the remote end.
• Channel Enable. Set to On to enable Channel A X.21 Data Channel
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DIP Switch 2 – 3 settings:
SW 2 V.24 Data Channel B Configuration SW3 – V.24 Channel C Configuration
8
7
6
5
4
3
2
1
Agg Channel
Baud Rate
Route
Mode
Assignment
00 = 1200
00 = via X.21 Agg. Port
00 = Disabled
00 = Ch 2
01 = 2400
01 = via Concat. Port
01 = Transparent
01 = Ch 3
10 = 4800
10 = Both Ports
10 = Async 8 bit
11 = 9600
11 = Local Loop
11 = Async 9 bit
•
Channel Allocation and Sharing: Select aggregate channel 2 or 3
Each V.24 Data Channel can be allocated to Aggregate Channel 2 or 3. More than
one port may share a channel.
Where more than one Data Channel is allocated to the same Aggregate Channel, the
ports share the aggregate channel. From the point of view of one of those ports,
Transmit Data would be sent over the aggregate channel and to all other ports
allocated to the same channel. Data from the aggregate channel or other such port(s)
would appear as Received Data. This feature is useful for supporting SCADA
systems where multiple terminals are attached, but they must be well disciplined
where only one terminal transmits at once, waiting for CTS after asserting RTS.
•
Mode: Disabled, Transparent, Async 8 bit, Async 9 bit.
Transparent is used where end-to-end delay is critical and may also be used for
applications where asynchronous character formats are not specifically supported.
The baud rate settings are ignored. (See section 5)
Async 8 bit is selected for:
or:
Async 9 bit is selected for:
•
7 data bits plus 1 parity bit (even or odd).
8 data bits plus 0 parity bit.
8 data bits plus 1 parity bit (even or odd).
Route: X.21 Port, Concatenation Port, Both Ports.
If X.21 Port is selected, traffic on the allocated aggregate channel terminates at this
port. That channel is then available for other traffic over the Concatenation Port.
If Concatenation Port is selected, data on the selected aggregate channel terminates
at this port and that channel is available for other data over the aggregate.
If Both is selected, traffic on the selected aggregate channel between X.21 Port and
Concatenation Port appears at RxD as an 'or' of data from either direction, and TxD is
sent in both directions. This mode is suitable only for a well-disciplined system
(where only one terminal transmits at once), waiting for CTS after asserting RTS.
Local Loop operates as described for DIP Switch 1
As channels B and C are asynchronous there is no requirement for a network clock.
•
Baud Rate: 1200, 2400, 4800, 9600 bits/sec.
When Async 8 or Async 9 mode is selected, set the baud rate to match the
connected equipment. 9600 bits/s requires allocation to a 32kHz sampling channel.
Do not set different baud rates for ports allocated to the same aggregate channel.
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DIP Switch 5 settings:
Switch 5 – X.21 Aggregate Channel and Concatenation Channel Enabling
8
7
6
5
4
3
2
1
Concatenation Port
X.21 Port
Local Loop
Spare
Mode
Local Loop Spare
Mode
00
=
Disabled
00
=
Disabled
0 = Off
0 = Off
01 = Enabled as DTE
01 = Enabled as DTE
1 = On
1 = On
10 = Enabled as DCE
10 = Enabled as DCE
(Test only)
(Test only)
11 = Enabled as Concat
11 = Not used
•
Mode: Disabled, Enabled as DTE, Enabled as DCE, Enabled as Concat (ie
DTE + Timing Signal X)
Enabled as DTE. This is the normal setting for the X.21 Port when connecting to X.21
links carrying network master clock timing (eg BT Kilostream)
Enabled as DCE. This optional setting is used when the X.21 link requires to be
synchronised to the network master clock signal received from a co-located
SMX3/21, (or to itself as master where network timing is unavailable). The timing
signal X is output on pins 6 and 13 (Sa and Sb). Timing must be selected
Enabled as Concat (ie DTE + Timing X). This is the normal setting for the
Concatenation Port when connecting to a co-located SMX3/21 using the Aggregate
Concatenation facility. The timing signal X is output on pins 7 and 14 (Xa and Xb).
•
Local Loop: Off / On
Normally set to Off.
When set to On, data transmitted out of the MUX on the aggregate is looped back to
its Receive input. The clock is required for this to function.
The method of operation is the same for the X.21 Aggregate Port and for the
Concatenation Port.
- In DTE mode (normal operation) the clock is sourced from the network, so
the network connection must be present for the local loop to operate.
- In DCE mode the clock is sourced from the MUX so the local loop works
independently of the network connection.
- In Concatenation mode the clock is sourced from the unit at the opposite
end of the link, so an SMX3/21 must be present at each end of the
concatenation link.
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DIP Switch 6 settings:
Switch 6 – Clock and Timing Configuration
8
7
6
5
Aggregate Speed
Clock
kbit/s
Source
00 = 64
00 = X.21 Port
01 = 128
01 = Concat port
10 = 192
10 = Master
11 = 256
11 = Auto
•
4
3
Not Used
2
1
RTS Time Out
Port C
Port B
0 = Disabled 0 = Disabled
1 = Enabled
1 = Enabled
V.24 Port RTS Timeout:
Normally set to Enabled for a polling system.
When Enabled, the effect of RTS ON is limited to 2 seconds, i.e. CTS and remote
DCD turn OFF and TxD is blocked. In order to recover, RTS
presented to the
port has to turn off and remain off for 2 seconds. This feature is to prevent a faulty
RTU of a SCADA system from interfering with traffic on the rest of the SCADA
system.
Do not set to Enabled when port is dedicated for use with MPR or other protection
relay, or when testing with a data tester.
•
Timing source: X.21 Port, Concatenation Port, Master, Auto,
X.21 is the normal setting for applications where the SMX3/21 X.21 port is connected
to a service synchronised with the network master clock.
Concatenation Port is the setting used when an X.21 link needs to be synchronised to
the network master clock signal from an adjacent link. Signal timing is via the
concatenation port from the co-located unit. When used in conjunction with the
modes Enabled as DCE, (or Enabled as DTE + Signal Timing X), the timing signal
received from the concatenation port will be output onto the X.21port.
Master is used where it is necessary for timing to be generated internally for SMX/21.
The clock is generated internally and transmitted on X on either the X.21 Aggregate
port or the Concatenation port. It is used with Enabled as DCE mode, (generally for
test purposes only), and for Enabled as Concat mode where two units are
interconnected via concatenation ports and the X.21 network service is unavailable.
Auto locks timing to the X.21 port as a priority and to the Concatenation port if that
fails. When timing is locked to the Concatenation port and an acceptable clock
appears on the X.21 port, timing source will revert to the X.21 port. This function has
a special application for East-West applications where both X.21 and Concatenation
ports receive network master clock timing. This is not used when concatenating
consecutive point to point links using the concatenation port to connect to an colocated SMX3/21.
•
Aggregate Speed: 64, 126, 192, 256 kbits/s
Set to match the network clock speed. For X.21 networks operating at n = 1, set to
64kbits/s. (Note: when using Channel A (X.21 port), it is not possible to use 64 or
192kbits/s, but it is possible to use the V.24 ports alone)
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11. LEDs
12 LEDs are located in the centre of the board for connection via flexible light pipes
to display locations. See equipment layout.
V24
X.21
11 12 2
LED
1
2
3
4
5
6
7
8
9
10
11
12
3
4
1
7
6
5
10 9
8
Colour
Function
Green
Green
Green
Green
Green
Green
Green
Green
Red/Green
Red/Green
Power input 1
Power input 2 (only where applicable)
X.21 Data Port A Transmitting data
X.21 Data Port A Receiving data
Not used
Not used
V.24 Port B Transmitting data
V.24 Port B Receiving data
V.24 Port C Transmitting data
V.24 Port C Receiving data
X.21 Agg. channel – see following table
Concatenation channel – see following table
Note: For units connected in a concatenated network, data on aggregate channels 2
and 3 is broadcast to all configured V.24 ports regardless of whether there is
equipment connected to those ports. In these cases Channel B and C Rx LEDs (viz.
data being transmitted from a DCE port) will signal green as traffic is carried.
LEDs 11 & 12 illuminate according to equipment and aggregate status on the
associated port. When communications are healthy, the LED should be solid green
for an enabled port.
X.21 Aggregate and Concatenation LED status
Display
Off
Fast flash (3/s)
Slow flash (1/s)
Steady
Red
Green
Yellow
RFL SMX3 / 21
User Manual
Condition
Port disabled
Configuration error
No clock present
Bit timing locked to Master Clock - Healthy
Aggregate frame not synchronised
Aggregate frame synchronised - Healthy
Yellow alarm (remote alarm)
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Issue 1.4
08 June 2009
12. Power Input
Power input is 48 Vdc nominal. (24V – 72V range).
SMX3/21 can be connected to positive earth, negative earth or floating supplies.
The power connections P1 and P2 are not polarity sensitive, but when using a
grounded supply, the 0V leg must be connected to P2. (See table)
A 500mA fuse (5 x 20mm) is in the rail connected to the P1 terminal.
A separate earth connection is required to the M4 Earth stud provided.
Power Input Connections
Type of supply
Positive Earth
Negative Earth
Floating
Terminal P1
– 48Vdc
+48Vdc
Either
Terminal P2
0V
0V
Either
Earth stud
Main Earth
Main Earth
Main Earth
13. Alarms
Two alarm relays are incorporated, energised when healthy. Each relay provides a
single changeover contact presented on a plug-in terminal strip, see equipment
layout. For a contact that closes on alarm, use common and NC connections.
•
Power alarm:
Energised when healthy
Alarm state is when applied voltage falls below nominal minimum voltage.
•
Aggregate communications alarm:
Alarm state is when any of the following conditions are present on either the
X.21 or Concatenation ports (only when enabled):
Aggregate port configuration error
No clock present
Aggregate frame not synchronised
Yellow alarm (remote alarm)
Function
Aggregate
Comms Alarm
Power Alarm
RFL SMX3 / 21
User Manual
Alarm Connections
Terminal
Contact
A
NC
B
Common
C
NO
D
NC
E
Common
F
NO
Page 19 of 22
Notes
Closed in alarm state
Closed when healthy
Closed in alarm state
Closed when healthy
Issue 1.4
08 June 2009
14. Example Configurations
Example 1: X.21 synchronous data point to point and two channels of V.24
asynchronous data point to point.
This configuration assumes a master clock signal is provided by the X.21 links.
V.24 channels configured in Transparent mode.
Example installation – Single X.21 and two V.24 channels
X.21
A1
X.21
Ch A
Port
B1
V.24
Ch B
Port
V.24
Ch C
Port
X.21
Ch A
Port
V.24
Ch B
Port
Substation A
V.24
Ch C
Port
Substation B
DIP Switch Settings for both units
SW1
SW2
SW3
SW4
SW5
SW6
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
1
0
1
0
0
0
1
0
0
0
0
0
0
0
0
Not used
0
0
0
0
0
0
0
0
1
0
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Issue 1.4
08 June 2009
Example 2: X.21 synchronous data links point to point, and two V.24
channels concatenated over two links (e.g. X.21 protection relays and
SCADA network on two BT kilostream X.21 links):
Only possible on a well disciplined system, where only one terminal transmits at
one time. This configuration assumes that both X.21 links are running on the
same network master clock e.g. BT Kilostream. V.24 channels configured in
Transparent mode.
Example installation – Protection & SCADA
Aggregate Concatenation
BT X.21
BT X.21
A1
X.21
Ch A
Port
V.24
Ch B
Port
B1
V.24
Ch C
Port
X.21
Ch A
Port
C1
B2
V.24
Ch B
Port
V.24
Ch C
Port
Substation A
X.21
Ch A
Port
V.24
Ch B
Port
X.21
Ch A
Port
V.24
Ch C
Port
Substation B
V.24
Ch B
Port
Substation C
DIP Switch Settings for A1, C1
SW1
SW2
SW3
SW4
SW5
SW6
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
1
0
1
0
0
0
1
0
0
0
0
0
0
0
0
Not used
0
0
0
0
0
0
0
0
1
0
DIP Switch Settings for units B1, B2
8
SW1
SW2
SW3
SW4
SW5
SW6
6
0
0
0
0
0
0
0
1
1
0
0
1
1
1
0
RFL SMX3 / 21
User Manual
7
5
0
0
0
0
0
0
Not used
0
0
0
0
Page 21 of 22
4
3
2
1
0
1
1
0
0
0
1
0
1
0
0
0
0
1
0
Issue 1.4
08 June 2009
V.24
Ch C
Port
15. Blank Setting Table
Blank setting table:
Location:
Reference:
DIP Switch Settings
8
7
6
5
4
3
2
1
SW1
SW2
SW3
SW4
SW5
SW6
©2009
RFL Communications plc
Connect 17
Avon Way
Langley park
CHIPPENHAM
Wilts
SN15 1GG
www.rflcomms.co.uk
Installation and Technical Support:
Phone +44 (0) 1249 446500
Fax +44 (0) 1249 446506
e-mail support@rflcomms.co.uk
RFL SMX3 / 21
User Manual
Page 22 of 22
Issue 1.4
08 June 2009