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#NTP #PTP #NetworkTiming #Meinberg

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Why it’s important to monitor your timing network
There are basically three levels of network time monitoring: 1. Self-reported performance
Of these, number 1, self-reporting is the easiest. Nearly every device which includes a PTP slave or an NTP client has management interfaces which can report on the timing applications synchronization state and estimate of the time offset from the NTP server or PTP master. Most likely you have something more urgent to attend to than staring at the offset values of all of the clocks on your network. But you can set up notifications, for example SNMP traps, if a device loses its synchronization source, or is seeing larger than expected time offsets. Because this is easy and will catch many network synchronization problems, you should definitely do this.
An NTP client or PTP slave doesn’t necessarily know the correct value for its clock offset. That’s because of Asymmetry. Asymmetry it the bane of network time transfer. Both NTP and PTP assume that t…

#Meinberg #PTP #Telecom #PowerGrid

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PTP Telecom Profile in Power Grids
PTP in Substations
PTP Time in substations is distributed using power profiles. There are two profiles defined for power applications: IEC 61850-9-3 Utility Profile and the IEEE C37.238 Power Profile. Both profiles are almost identical with a few special settings in the Power Profile. They are designed for Layer-2 networks, either Ethernet, HSR or PRP. For details on HSR and PRP please refer to one of our previous posts. They use the Peer Delay measurement mechanism; therefore all switches need to have PTP support and are either transparent clocks or boundary clocks.
PTP can be used also to transfer timing from substation to substation. In this case the communication goes to an adjacent substation or to a SCADA network and the Substation gets timing from there. Such PTP inter-grid network can serve also as a failover in case of GPS failing or jamming.


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