Method for switching master/slave timing in a 1000BASE-T link without traffic disruption

摘要

A method switches master/slave timing in a communication network without traffic disruption. The method includes a master device informing a slave of timing loss. The master device additionally begins transmitting with timing from a local reference clock and begins receive timing recovery. The slave freezes its receive timing recovery and locks its transmit clock. The master device transitions its transmit timing to use the recovered receive clock. The slave gradually switches to transmitting using its local clock signal. The method may be used in synchronous Ethernet networks.

主权项

1. A method for reconfiguring a timing relationship in a network, the network comprising network nodes comprising at least one physical layer device, the physical layer devices pair-wise coupled between network nodes with a first node with a first physical layer device operating as a master and a second node with a second physical layer device operating as a slave, the method comprising:
transmitting signals from the first physical layer device of the first node to the second physical layer device of the second node using a reference clock local to the first node; transmitting signals from the second physical layer device of the second node to the first physical device of the first node using a clock signal recovered from signals received from the first physical layer device of the first node; performing timing recovery, by the first node, on signals received from the second node; freezing timing recovery, by the second node, of signals received from the first node; switching the first physical layer device of the first node to transmit signals using a clock signal recovered from signals received from the second physical layer device of the second node; and switching the second physical layer device of the second node to transmit signals using a clock signal local to the second node.