Traditionally, only clock frequency is required to ensure smooth transmission in a synchronous network. The PTP ordinary clock with slave capability on the router provides another option to reference a Stratum-1 traceable clock across a packet-switched network. The recovered clock can be referenced by the internal SSU and distributed to all slots and ports. Figure 1 shows a PTP ordinary slave clock network configuration.
Figure 1. Slave Clock
The PTP slave capability is implemented on the CPM, version 3 or later. The IEEE 1588v2 messages can ingress and egress the router on any line interface. Figure 2 shows the operation of an ordinary PTP clock in slave mode.
Figure 2. Ordinary Slave Clock Operation
