Precision Time Protocol (PTP)

Support for Synchronous Ethernet with Precision Time Protocol (PTP) Transparent Clock (ACX7024)—The transparent clock measures the residence time of PTP packets as the packets pass through the router. The network load and device architecture might result in queuing or buffering delays. These delays are the main source of packet delay variation in the router.

Transparent clock adds the residence time into the correction field of the PTP packet. The client or boundary clocks can determine this resident time while they receive the PTP packet from the upstream transparent clock router. The client clock can estimate and remove these delays from the offset computation and reduce the packet’s jitter effects.

In a syntonized transparent clock, the transparent clock requires physical layer frequency based on the ITU-T G.8262/.1 standard. Synchronous Ethernet configuration is mandatory for enabling a syntonized transparent clock.

Use the show protocols ptp and show ptp global-information commands to verify the PTP transparent clock configuration status.

To enable PTP transparent clock on your device, configure the syntonized-e2e-transparent configuration statement at the [edit protocols ptp] hierarchy level.

[See PTP Transparent Clocks and show ptp global-information.]