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
1MRK 505 382-UEN B Section 6
Appendix
Communication set-up 670/650 series 2.2 101
Application Guide
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