21-216, Fiber Optic G.703 Codir – IEEE C37.94 converter

Application Note 2006-001
Fibersystem products in Power Substation environment
Fibersystem has a range of products suited for operation in power substation environment.
Fiber optic interfaces are used both for galvanic isolation and extending distance.
In this Application Note the following products are described:
Optical interfaces
Product
21-16xx
21-170
21-180
21-216
21-219
23-45X
21-203
Fibersystem
IEEE
C37.94
Electrical Interfaces
Transfer
Trip
X.21
64kbps
G.703
64kbps
G.703
2048kbps
1
1
1
1
1
1
1
1
1
1
2
1
1
X
BI/BO
X
-
-
-
4+4
-
21-1651, Fo modem G.703/X.21/RS530
The modem 21-1651 from Fibersystem is a combined fiber optic synchronous and asynchronous
modem with four different interfaces.
The interfaces are:
G.703 unbalanced 2Mbps,
G.703 balanced Nx64Kbps,
X.21
The modems are available in 2 versions.
21-1601 runs on 110-230 VAC , +/- 20%, power supply.
21-1651 runs on 48-250 VDC, +/- 20%, power supply.
The modem can be mounted in 19” rack with the mounting brackets included with the product.
In synchronous mode the data rate are settable from 4.8kbps to 2048kbps.
To run the modem in asynchronous mode the data rate must be set to at least 8 times the actual data
rate giving a maximum asynchronous rate of 256kbps.
The modem can be configured to use three models of clock generation:
Internal clock, where the modem generates the transmit clock.
External clock, where the modem recovers the clock from the selected electrical interface.
Loop clock, where the modem recovers the clock from the fiber link.
The 21-1601 or 21-1651 can be connected to a telecom network or “back-to-back”.
The front panel is marked 21-16xx and the product is often referred to as “21-16”.
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Application Note 2006-001
21-16xx Applications
The fiberoptic port of the ABB REL55x/56x , Line Differential Protection Terminals, is directly
connected to the fiberoptic port of 21-16xx. The 21-16xx Codir-port is then connected to a 64kbps
interface at a PDH multiplexer.
PDH Multiplexer
PDH Multiplexer
Telecom
Network
21-16xx
G.703
64kbps codir
galvanic
G.703
64kbps codir
fiber optic
REL 55x / 56x
REL 55x / 56x
60-00-2721
60-00-3521
64kbps
fiber optic
interface
64kbps galvanic interface
Or connect to another Fibersystem product using the same fiber optic protocol.
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Application Note 2006-001
21-180, Fo modem G.703
The 21-180, Fiberoptic G.703 converter is intended to extend distance and galvanic isolate the
teleprotection equipment for substations connection to telecom network.
The 21-180 converts the galvanic codirectional interface signals to a proprietary fiber optic protocol.
21-180 Applications
The fiberoptic port of the ABB REL55x/56x , Line Differential Protection Terminals, is directly
connected to the fiberoptic port of 21-180. The 21-180 Codir-port is then connected to a 64kbps
interface at a PDH multiplexer.
PDH Multiplexer
PDH Multiplexer
G.703
64kbps codir
galvanic
Telecom
Network
21-180
G.703
64kbps codir
galvanic
G.703
64kbps codir
fiber optic
REL 55x / 56x
REL 55x / 56x
60-00-2721
60-00-3521
64kbps
fiber optic
interface
64kbps galvanic interface
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Application Note 2006-001
Or connect to another Fibersystem product using the same fiber optic protocol.
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Application Note 2006-001
60-00-2721, Fo G.703 modem vers 2.
The 60-00-2721 is a plugin card for ABB REL500 series, with a 64kbps G.703 codirectional fiber optic
interface. The fiber optic protocol is compatible with Fibersystem products as 21-16xx, 21-170 and
21-180.
60-00-5259, Dual Channel Modem
The 60-00-5259 is a plugin card for ABB REL500 series, with two 64kbps G.703 codirectional fiber
optic interfaces. The fiber optic protocol is compatible with Fibersystem products as 21-16xx, 21-170
and 21-180.
The two fiber optic interfaces are constantly monitored for signal. If signal is lost on the primarily
selected port, the card will automatically switchover to the secondary port.
60-00-3521, Fo G.703 modem vers 2.
The 60-00-3521 is a plugin card for ABB REL500 series, with a standard 64kbps G.703 galvanic
interface. The protocol is compatible with all standard G.703 codir interfaces for example on
PDH/SDH-multiplexers and Fibersystem products as 21-16xx, 21-180 and 21-216.
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Application Note 2006-001
21-170, Fiber Optic G.703 E1 Converter
The 21-170, Fiberoptic G.703 E1 converter is intended to extend distance and to provide galvanic
isolation for disturbance free insertion of 64kbit/s data in G.703 PCM timeslots. The 21-170 can be
connected to a telecom network or “back-to-back”.
The 64kbit/s “codir-channel”, is inserted/extracted in timeslot 31 in the E1-protocol.
8 databits
1 2 3 4 5 6 7 8
0
1
2
.....
16
125us
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.....
30
31
Application Note 2006-001
21-170 Applications
The fiberoptic ports from the Line Differential Protection Terminals are directly connected to a
2048kbps G.703 E1 duplex channel. For example leased channels.
21-170
E1
unbal
Telecom
Network
E1
unbal
21-170
G.703
64kbps codir
fiber optic
G.703
64kbps codir
fiber optic
REL 55x / 56x
REL 55x / 56x
60-00-2721
60-00-2721
64kbps
fiber optic
interface
64kbps
fiber optic
interface
Or connect to another Fibersystem product using the same fiber optic protocol.
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Application Note 2006-001
21-216, Fiber Optic G.703 Codir – IEEE C37.94 converter
The 21-216, Fiberoptic G.703 Codir – IEEE C37.94 converter is intended to extend distance and
galvanic isolate the teleprotection equipment for substations connection to multiplexers.
21-216 Applications
PDH Multiplexer
PDH Multiplexer
Telecom
Network
G.703 64kbps codir
electrical
G.703 64kbps codir
electrical
21-216
21-216
IEEE C37.94
fiber
IEEE C37.94
fiber
REL 670
REL 670
IEEE C37.94 link via Telecom network.
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Application Note 2006-001
21-219, Fo IEEE C37.94-G.703 E1 mux
The 21-219, Fiberoptic IEEE C37.94 - G.703 E1 converter is intended to extend distance and galvanic
isolate the teleprotection equipment for substations connection to telecom network.
There are two C37.94 fiber optic ports that are multiplexed into one E1-protocol.
“Channel 0” is inserted/extracted in timeslot 1 – 13 in the E1-protocol.
“Channel 1” is inserted/extracted in timeslot 17 – 29 in the E1-protocol.
E1 timeslot 0 contains framing/synchronization information. Timeslots 14, 15, 16, 30 and 31 are
ignored at receive and set to 0 at transmit.
IEEE C37.94 ”Channel 0"
IEEE C37.94 ”Channel 1"
1+12 timeslots
N 1 2 3 4 5 6 7 8 9 101112
0
1
2
.....
13
1+12 timeslots
N 1 2 3 4 5 6 7 8 9 101112
.....
16
17
.....
29
30
31
125us
E1 - timeslots
In the IEEE C37.94 protocol each data bit is followed by its complement. Only “true”, (non
complement), data bits are transferred to E1-protocol.
The N is fetched from the IEEE C97.94 protocol indicating the number of timeslots used in the
protocol.
The 21-219 transfer the N-value but don’t use it for any other purpose.
All data bits in all 12 timeslots are transferred, regardless of the value of N.
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Application Note 2006-001
21-219 Applications
Single IEEE C37.94 link via Telecom network.
Dual IEEE C37.94 link via Telecom network.
Redundant REL 670 system.
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Application Note 2006-001
21-203, Fo MM/SM 4B/5B konv SC-SC 80km
The multimode to singlemode converter 21-203, is designed to extend the maximum connection
distance between two “Short range fiber optical modules” in ABB REL551/561.
The 21-206 can most probably be used for other fiber optic interfaces if jitter issues are considered and
evaluated.
The incoming multi mode fiber signal is sampled at 25MS/s. This is equal to 40ns between samples.
So the 21-203 link will add a maximum of 40ns jitter to the signal. For example the IEEE C37.94
protocol shall accept jitter up to ± 50ns for teleprotection equipment and ± 100ns for multiplexer unit.
This enables the opportunity to use the 21-203 for fiber optic protocols of IEEE C37.94 or G.703
2048kbps, (E1), but the link must be thoroughly tested for example by using a BERT, Bit Error Rate
Tester. Some equipment include a jitter attenuator which will increase the probability that 21-203 will
work in that application.
By using singlemode fiber and a laser of 1550nm optical wavelength, the maximum distance can be
extended up to typically 80km, depending on the optical budget.
If fiber optical cable attenuation is measured properly and found to be within power budget (31dB),
the maximum distance can be even more than 80km.
Safety margin of at least 3dB. 31dB – 3dB = 28dB, must be included in the optical budget.
For a complete link two 21-203 converters are needed.
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Application Note 2006-001
21-203 Applications
2 - 80 km
SM fiber
21-203
21-203
0 – 3.5 km
MM
fiber
0 – 3.5km
MM
fiber
REL 551/561
REL 551/561
60-00-2721
60-00-2721
64kbps
fiber optic
interface
64kbps
fiber optic
interface
Teleprotection with fiber optic interfaces.
2 - 80 km
SM fiber
21-203
21-203
0 – 3.5km
MM
fiber
0 – 3.5 km
MM
fiber
21-16xx
21-16xx
Codir 64kbps
electric
Codir 64kbps
electric
REL 551/561
REL 551/561
Teleprotection with electric/galvanic interfaces.
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Application Note 2006-001
23-45x, Fo Transfer Trip Link
The Fiber Optic Transfer Trip Link is intended to extend binary functions over medium and long
distances. E.g. transfer trip.
The link can be delivered with fiber optic components for distances up to 80km. The protocol used by
the link is designed to have high security..
The transfer trip time is around 8ms from Binary Input to Binary Output.
The link is designed for duplex mode, (2 fibers). 4 signals can be transferred in each direction. The link
can also be used in simplex mode, (1 fiber). Note that the remote alarm function has no relevance in
simplex mode..
Every binary input is “sampled” with 25Msamples per second.
The sampled input data is filtered for changes over a period of 1ms.
The filtered input data is sent as a data message on the fiber.
4 x Binary Input
Low Pass
1ms
+
Input 1
+
Input 2
Fiber Optic Link
+
Input 3
+
25MS/s
Input 4
Optocoupler
Filter
Serializer and Fiber transmitter
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Application Note 2006-001
In order to increase the security, for example against disturbances, the protocol on the fiber, needs 4
consecutive equal data messages before any change of the Binary output.
In addition there is a fiber optic link-control, indicating correct received data messages. This is
indicated to the user by a “Link OK” – LED.
4 x Binary Output
Relay
Output 1
4 bit
memory
Relay
Output 2
4 bit
memory
Fiber Optic Link
Relay
Output 3
4 bit
memory
Relay
Output 4
4 bit
memory
Fiber Receiver and Deserializer
Filter
Relays Outputs
There is also a “Local alarm” – LED, and a “Local alarm” relay. (Contact open at no error). The relay
and the LED are activated when an error is found. For example, at link loss.
Both the “Local Alarm”-LED and -relay has a latched function. When an error is detected in the local
unit, the Local Alarm-LED is lit and the Local Alarm-relay is activated. They stay activated until the
Reset alarm button is pressed.
In duplex mode, the “Local alarm” – indication is sent to the remote unit, and is there indicated as
“Remote alarm”.
There is one “Remote alarm” – LED, and one “Remote alarm” relay.
The Remote Alarm-LED and relay has a monostable latch function. An error detected in the remote
unit will be sent to the local unit and indicated by Remote Alarm-LED and relay. When the remote
unit no longer detects errors, Link-OK, Remote Alarm-LED and the relay, are inactivated. Short
remote error pulses are prolonged to some seconds of time, to make sure all Remote Alarms are
detectable and visualized.
Both “Local alarm” and “Remote alarm” relay outputs have the same data as for the Binary outputs.
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Application Note 2006-001
FO
FO
Rx
Tx
Binary Outputs
Binary Inputs
No 1
1
1
2
2
No 2
3
3
4
4
No 3
5
5
6
6
No 4
7
7
8
8
Local
9
Alarm
+
-
+
-
+
-
+
-
Power Supply
10
Remote
11
12
48-250V DC
110-230V AC
IEC 320 Plug
IEC 320 Plug
There are four different Fiber Optic Transfer Trip Links available:
23-450, Fo Transfer Trip Link MM BI:110V
23-452, Fo Transfer Trip Link SM BI:220V
23-453, Fo Transfer Trip Link SM BI:110V
23-454, Fo Transfer Trip Link MM BI:220V
Product
23-450
23-452
23-453
23-454
Fiber Interface/Typical Distance
Multi Mode, MM/ 2km
Single Mode, SM/80km
Single Mode, SM/80km
Multi Mode, MM/ 2km
Binary Input Range
85 – 150 VDC
176 – 300 VDC
85 – 150 VDC
176 - 300 VDC
Other combinations of distance and voltage ranges are available on request.
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Application Note 2006-001
Other Fiber Optic Links
Fibersystem has a wide range of fiber optic transceivers, modems and links that are well suited for
substation operation.
They can be used for galvanic isolation or/and extending distance.
Examples of additional interfaces/converters/modems/links:
RS-232
Fibersystem has a wide range of fiber optic transceivers with RS-232
interface. For asynchronous or synchronous communication, short
distance with plastic fiber or multimode glass fiber or for long distance
with single mode glass fiber.
Applications: For example galvanic isolation of telephone modems.
Telemetry. Industrial control systems.
IEC 60870-5-103 is a standard for “Telecontrol equipment and systems - Part
5-103: Transmission protocols - Companion standard for the informative interface of
protection equipment “, in short referred to as “IEC-103”. This standard
describes a fiber optic interface for POF, Plastic Optical Fiber.
The Fibersystem product 20-104 apply to this standard.
RS-422/485
Applications: Industrial control systems. Single links or multi drop
systems.
Ethernet
10BaseFL, 100BaseFX, 1000BaseSX/LX.
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Application Note 2006-001
KVMX
Extension of PC-workstations. Keyboard, Video and Mouse eXtension.
PS/2, USB, COM-port, VGA, DVI, Reset and Sound.
USB (1.1 and 2.0)
Applications: Remote data collection. Remote backup storage. Remote
printing.
Most products are available as stand alone units or for rack mounting.
For Multi Mode Fiber or Single Mode Fibers.
Distances up to 80km.
For information on these products or any interface you are missing, contact us at
contact@fibersystem.se.
Protocol conversion
Fibersystems proprietary protocol is used in a number of our products, enabling interface conversions.
For example just by configure one 21-16xx for G.703 interface you can configure the other 21-16xx ,
(remote unit), in the link to X.21. The interfaces must have the same clock rate, for example 64kbps.
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Application Note 2006-001
Interfaces
G.703 Codirectional
The ITU-standard “G.703 64kbit/s codirectional interface” describes a galvanic interface. This
interface is for example commonly used by teleprotection equipment for connection to telecom
multiplexers.
The codirectional interface is transferred at one balanced pair for each direction.
Fiber Optic G.703 Codirectional
Fibersystem converts the galvanic codirectional interface signals to a proprietary fiber optic protocol.
G.703 Contradirectional
The ITU-standard “G.703 64kbit/s contradirectional interface” describes a galvanic interface.
The contradirectional interface is transferred at two symmetrical pairs for each direction. One pair
carrying the data signal and the other carrying a composite timing signal (64kHz and 8kHz).
Fiber Optic G.703 Contradirectional
Fibersystem converts the galvanic contradirectional interface signals to a proprietary fiber optic
protocol.
G.703 2048kbit/s unbalanced
The ITU-standard G.703, E1, 2048kbit/s unbalanced, (75 Ohm BNC), ports are intended to connect
to, for example a telecom multiplexer. The 21-16xx transfer HDB3-koded signals with or without
frameing.
Fiber Optic G.703 2048kbit/s unbalanced
Fibersystem converts the galvanic G.703 2048kbit/s unbalanced interface signals to a proprietary fiber
optic protocol.
X.21
The ITU-standard X.21 is an interface primarily used in telecom for connection of “customers (DTE)
equipment” to “carrier’s (DCE) equipment”.
All signals are balanced.
Fiber Optic X.21
Fibersystem converts the galvanic X.21 interface signals to a proprietary fiber optic protocol.
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Application Note 2006-001
IEEE C37.94
The standard “IEEE C37.94-2002, IEEE Standard for N times 64 Kilobit per Second Optical Fiber
Interfaces between Teleprotection and Multiplexer Equipment” describes a fiberoptic intra-substation
communication links between teleprotection equipment and multiplexers.
125µs
250µs
375µs
500µs
(256 bit frame)
( 16 bits )
Header (sync)
a b c d e f g h 0 0 0 0 1 1 1 1
( 48 bits )
Overhead
p /p q /q r /r s /s 1 0 1 0 1 0 1 0
……...
1 0
( 192 bits )
Channel Data (payload)
D1 /D1 D2 /D2 D3 /D3 D4 /D4 ……...
D96 /D96
The bit c in “Header” is used for “Yellow Alarm”. (Every other frame).
Bits p,q,r and s in “Overhead” form a HEX-value indicating the number of timeslots used for data.
0.0.0.1 for N=1
0.0.1.0 for N=2
….
1.1.0.0 for N=12 , (0CH).
12 timeslots, (1 timeslot has 8bits Î 12x8bits=96bits. With complement bits Î 2x96=192 bits). Data
bits in not used timeslots are set to 1.
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Application Note 2006-001
Further Reading
Datasheets are available on our website http://www.fibersystem.se/ or contact us at
contact@fibersystem.se .
Revision History
Revision history for this document:
Date
2006-10-26
2006-11-28
2007-02-01
Version
AK1
R0
R1
Revision
Document created
Document released
Application drawings corrected, RS232 information added.
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