Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?




Hierarchy Level


Configure the syntonized-end-to-end (E2E) transparent clock for Precision Time Protocol (PTP). In syntonized transparent clock, the transparent clock requires physical layer frequency based on the ITU-T G.8262/.1 standard. To set syntonized transparent clock, you can enable Synchronous Ethernet configuration with Ethernet Synchronization Message Channel (ESMC) along with PTP transparent clock configuration. Syntonization supports frequency synchronization but does not support phase or time synchronization.

The transparent clock measures the residence time of PTP packets as the packets pass through the router. Transparent clock adds the residence time into the correction field of the PTP packet. The client or boundary clocks determine this resident time while they receive the PTP packet from the upstream transparent clock router. The client clock estimates and removes these delays from the offset computation and reduce the packet’s jitter effects.

Transparent clock functionality is supported on PTP over Ethernet, IPv4, IPv6, unicast, and multicast. Transparent clock functionality is enabled globally and might be required in scenarios in which the interface and the packets are received and transmitted is unknown.

ACX5048 and ACX5096 routers do not support PTP over IPv6 for transparent clocks.


There are no options.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 21.1R1 EVO.