IEC07000221 V2 EN-US
Figure 3: Three-end application (protection master/slave)
2.3.1 Maximum time deviation between internal clocks
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2.3.1.1 Setting the maximum time deviation
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Maximum time deviation between internal clocks is set using the MaxtDiffLevel parameter in the
respective (one to five) line differential protection IEDs. The setting is done on the local HMI or via
PCM600 (see Figure
4). Maximum time deviation depends on:
• Jitter and wander in the telecommunication network: typically ±100-200 μs in PDH networks and
±50 μs in SDH networks (< ±100 μs according to telecommunication standards).
• Acceptable small asymmetric delay: typically ±50–100 μs. A constant (fixed) asymmetric delay
in the duplex channels can be adjusted by setting the asymmetric delay on the local HMI or via
the parameter setting tool (PST) which is part of PCM600.
• Buffer memory in the telecommunication network: typically < +100 μs (buffer memories should
be avoided).
• Clock drift during two seconds: < ±100 μs.
IEC10000062 V1 EN-US
Figure 4: Setting the MaxtDiffLevel in PCM600
1MRK505382-UEN Rev. K Section 2
Telecommunication networks and line differential protection
Communication set-up, 670/650 series 13
Application Guide
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