GE 869, Communications Manual

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3-2 869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE
REAL-TIME CLOCK CHAPTER 3: TIME PROTOCOLS
Path :
Status > PTP
The RTC Sync Source actual value is the time synchronizing source the relay is using at
present. Possible sources are: Port 4 PTP Clock, Port 5 PTP Clock, IRIG-B, SNTP and None.
Grandmaster ID is the grandmaster Identity code being received from the present PTP
grandmaster, if any. When the relay is not using any PTP grandmaster, this actual value is
zero. The grandmaster Identity code is specified by PTP to be globally unique, so one can
always know which clock is grandmaster in a system with multiple grandmaster-capable
clocks.
RTC Accuracy is the estimated maximum time difference at present in the Real Time Clock
(RTC), considering the quality information imbedded in the received time signal, how long
the relay has had to lock to the time source, and in the case of time signal interruptions,
the length of the interruption. The value 999,999,999 indicates that the magnitude of the
estimated difference is one second or more, or that the difference cannot be estimated.
Port 4 (5) PTP State is the present state of the port’s PTP clock. The PTP clock state is:
• DISABLED
If the port’s function setting is Disabled
• NO SIGNAL
If enabled but no signal from an active master has been found and selected
• CALIBRATING
If an active master has been selected but lock is not at present established
• SYNCH’D (NO PDELAY)
If the port is synchronized, but the peer delay mechanism is non-operational
• SYNCHRONIZED
If the port is synchronized