The optional PTP performance monitoring feature was added to ITU-T G.8275 in January 2024 as Annex F, aiming to help network operators assess the timing accuracy and health without the need for external measurement devices. This is achieved by collecting different metrics regarding timing accuracy, namely the Time Transmitter (TT) to Time Receiver (TR) delay, TR-TT delay, Mean Path Delay, and Offset from TT, as well as PTP message counters.

At this year’s testing event, we tested the support for this feature for the first time.
We deployed a cascaded setup consisting of one Telecom Grandmaster (T-GM), followed by seven Telecom Boundary Clocks (T-BCs), with each T-BC connected to either a Calnex Paragon neo, a Paragon neo-A, or a Keysight Time Sync Analyzer to verify timing accuracy and message counter metrics.
Every T-BC participant accurately demonstrated the PTP performance monitoring feature for intervals of 1 minute, 3 minutes, 15 minutes, 1 hour, or multiple of these intervals, reporting results that agreed with the values monitored on the measurement devices.

Table 77: PTP Performance Monitoring - Devices Under Test