Section 6
Appendix
6.1
Sample specification of communication requirements
GUID-5F3AF242-270C-4FA2-8DA3-7A3532609D7B v1
This chapter provides a sample specification of communication requirements for line
differential protection IEDs in telecommunication networks. The requirements are based on
echo timing.
Bit error rate (BER) according to ITU-T G.821, G.826 and G.828
•
< 10
-6
according to the standard for data and voice transfer
Bit error rate (BER) with high availability of the line differential
protection IED
•
< 10
-8
to 10
-9
during normal operation
•
< 10
-6
during disturbed operation
During disturbed operation, the trip security function in the line differential
protection IED can cope with high bit error rates up to 10
-5
or even up to 10
-4
.
Trip security can be configured to be independent from COMFAIL of the line
differential protection communication supervision, or it can be blocked when
COMFAIL is issued after receive error > 100 ms (default).
Synchronization in SDH systems with G.703 E1 or IEEE C37.94
G.703 E1 (2 Mbit/s) is set according to ITU-T G.803, G.810-13.
•
One master clock for the actual network
•
Actual port synchronized from the SDH system clock at 2048 kbit
•
Synchronization: bit synchronized, synchronized mapping
•
Maximum clock deviation: < ±50 ppm nominal, < ±100 ppm operational
•
Jitter and wander according to ITU-T G.823 and G.825
•
Buffer memory: < 250 μs, < 100 μs asymmetric difference
•
G.704 frame format: structured, unstructured, and so on
•
No CRC check
Synchronization in PDH systems connected to SDH systems
•
Independent synchronization, asynchronous mapping
•
Actual SDH port set to allow transmission of the master clock from the PDH network (SDH
network in transparent mode)
•
Maximum clock deviation: < ±50 ppm nominal, < ±100 ppm operational
•
Jitter and wander according to ITU-T G.823 and G.825
•
Buffer memory: <1 00 μs
•
Format: transparent
•
Maximum channel delay
•
Loop time: < 40 ms continuous (2 x 20 ms)
1MRK 505 382-UEN E
Section 6
Appendix
Communication set-up, 670/650 series
91
Application Guide
© Copyright 2017 ABB. All rights reserved
Summary of Contents for Relion 670 series
Page 1: ...Relion 670 650 SERIES Communication set up 670 650 series Version 2 2 Application Guide...
Page 2: ......
Page 10: ...4...
Page 99: ...93...
