TOI Author :: Jim George

The PTP Boundary Clock advertises time based on its local clock, which is counting from an unsynchronized initial value. Hence a free running Boundary Clock would advertise PTP downstream based on counting from an unsynchronized initial value. The GrandMaster, with access to GPS, is however Temps Atomique International (TAI) based. Hence Boundary Clock, which was originally based on unsynchronized initial value, post synchronization with the GrandMaster becomes TAI based. This causes the Boundary Clock’s time and hence PTP advertised downstream, to change drastically.