Customer Service Center
Spirent KB Article
Doc ID: FAQ16482
Email Article Link
Spirent TestCenter: Why does the IEEE-1588v2 emulation send an Announce message with 36s offset?
The OriginCurrentUTCOffset in the Announce packet is just to say which epoch time we are using.
It’s in the 1588 spec, 7.2.3 page 42.
Basically we are saying our clock is 36 seconds ahead of UTC time.
This is a standard number which basically represents the number of leap seconds from PTP epoch (
The UTCOffset value was changed in June 2015 to 36. This offset has no relation to local offset of the master clock that is received by the slave.
This value on the Spirent TestCenter application is user configurable.
Product : Spirent TestCenter,IEEE 1588