Enhanced Phase Synchronization of a Timing Slave Apparatus in a Packet Switching Network

摘要

In one embodiment, a timing slave packet switching device receives a received primary reference clock signal. The timing slave packet switching device communicates a first plurality of packet network synchronization packets over a packet switching network with a remote primary reference clock source and derives an over-network clock based on the first plurality of packet network synchronization packets. A phase offset between the phase of the over-network clock and the phase of the received primary reference clock signal is determined and typically stored in non-volatile storage. Subsequent to said determining the phase offset, the timing slave packet switching device communicates a second plurality of packet network synchronization packets over the packet switching network with the remote primary reference clock source and adjusts the phase of a clock derived from the second plurality of packet network synchronization packets based on the phase offset.

主权项

1. A method, comprising:
receiving, by a timing slave packet switching device, a received primary reference clock signal; communicating a first plurality of packet network synchronization packets by the timing slave packet switching device over a packet switching network with a remote primary reference clock source and deriving an over-network clock based on the first plurality of packet network synchronization packets; determining a phase offset between the phase of the over-network clock and the phase of the received primary reference clock signal; and subsequent to said determining the phase offset, communicating a second plurality of packet network synchronization packets by the timing slave packet switching device over the packet switching network with the remote primary reference clock source and adjusting the phase of a clock derived from the second plurality of packet network synchronization packets based on the phase offset.