EndRun Sonoma N12, User Manual

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S o n o m a U s e r M a n u a l 38
C H A P T E R F O U R
39 S o n o m a U s e r M a n u a l
P T P / I E E E - 1 5 8 8
clock transmits the PTP epoch (TAI) and sets the PTP Scale to PTP. See About the PTP Second and
UTC Time
at the end of this chapter for more information.
The PTP Multicast TTL is user configured in a range from 1 to 255. For a local area network the TTL
should be configured to 1.
PTP Clock Class one of SYNCHRONIZED, HOLDOVER, or UNLOCKED. The Clock Class is
SYNCHRONIZED when the GPS Subsystem TFOM level is 3 or 4 (see
Appendix A - TFOM
). The
Clock Class is HOLDOVER when the GPS Subsystem TFOM level is greater than 4 and less than 9.
The Clock Class is UNLOCKED when the GPS Subsystem TFOM level is 9.
The PTP Timescale either PTP or ARB. When Time Mode is configured to PTP the clock transmits
the Timescale as PTP. When the Time mode is UTC the clock transmits the Timescale as ARB.
The PTP Port State is one of MASTER, PASSIVE or LISTENING. The PTP Port State is selected as
MASTER by the best master clock algorithm, otherwise it is PASSIVE or LISTENING.
The PTP Clock Source is either GPS or OSC. The Clock Source is GPS if the Clock Class is Syn-
chronized, otherwise it is OSC based on the system oscillator.
The PTP UTC Offset is the offset between TAI and UTC in units of seconds.
The PTP UTC Offset Valid is either TRUE or FALSE. The UTC Offset Valid is TRUE if the current
UTC Offset is known to be correct, otherwise it is FALSE.
The PTP Clock Accuracy is transmitted when the time is accurate to within the the following:
25ns Clock is synchronized or in holdover, PTP clock < 25 nanoseconds
100ns Clock is synchronized or in holdover, PTP clock < 100 nanoseconds
250ns Clock is synchronized or in holdover, PTP clock < 250 nanoseconds
1us Clock is synchronized or in holdover, PTP clock < 1 microsecond
2.5us Clock is synchronized or in holdover, PTP clock < 2.5 microseconds
10us Clock is synchronized or in holdover, PTP clock < 10 microseconds
25us Clock is synchronized or in holdover, PTP clock < 25 microseconds
100us Clock is synchronized or in holdover, PTP clock < 100 microseconds
250us Clock is synchronized or in holdover, PTP clock < 250 microseconds
1ms Clock is synchronized or in holdover, PTP clock < 1 millisecond
2.5ms Clock is synchronized or in holdover, PTP clock < 2.5 milliseconds
10ms Clock is synchronized or in holdover, PTP clock < 10 milliseconds
Unknown Clock is unsynchronized, TFOM = 9
The PTP Leap 59 second indicator is either TRUE or FALSE. The Leap 59 is TRUE if the PTP Tim-
escale is PTP and the last minute of the current UTC day contains 59 seconds, otherwise it is FALSE.
The PTP Leap 61 second indicator is either TRUE or FALSE. The Leap 61 is TRUE if the PTP Tim-
escale is PTP and the last minute of the current UTC day contains 61 seconds, otherwise it is FALSE.
The PTP Time Traceable indicator is either TRUE or FALSE. The Time Traceable is TRUE if the
Time Scale is PTP and the Clock Class is Synchronized or Holdover, otherwise it is FALSE.