Ptp Clock Redundancy - Alcatel-Lucent 7450 Basic System Configuration Manual

Ethernet service switch /service router /extensible routing system

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Network Synchronization

In addition, the use of port based timestamping in every network element between the

grandmaster and the end slave application is highly recommended for delivering time to meet

one microsecond accuracies required of mobile applications.

The router always uses the frequency output of the central clock to maintain the timebase

within the router. The PTP reference into the central clock should always be enabled as an

option if the router is configured as a boundary clock. This avoids the situation of the router

entering holdover while propagating time with 1588.

PTP Clock Redundancy

The PTP module in the router exists on the CPM. The PTP module on the standby CPM is

kept synchronized to the PTP module on the active CPM. All sessions with external PTP

peers are maintained over a CPM switchover.

Figure 24: Boundary Clock

Basic System Configuration Guide