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Spirent KB Article
Doc ID: FAQ19084
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STC: Is it possible to get the emulated gPTP clock closer to the NTP clock?
STC Emulated gPTP clock have a difference within 400 milliseconds with NTP clock.
Spirent TestCenter 5.07 release or older.
Until now it's not possible to reduce the time difference between STC Emulated gPTP clock and an NTP clock.
The STC gPTP/PTP emulation does not really need the emulation to provide time which is exactly same as the chassis time, so then achieving this will need fundamental changes to ptp/gPTP device emulation.
Product : Spirent TestCenter