Page 248 7450 ESS OS Basic System Configuration Guide
State and statistics data for each PTP peer are available to assist in the detection of failures or
unusual situations.
PTP Ordinary Slave Clock For Frequency
Traditionally, only clock frequency is required to ensure smooth transmission in a synchronous
network. The PTP ordinary clock with slave capability on the 7450 ESS 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 16 shows a PTP
ordinary slave clock network configuration.
Figure 14: Slave Clock
The PTP slave capability is implemented on the CPM, version 3 or later. The IEEE 1588v2
messages can ingress and egress the node on any line interface. Figure 17 shows the operation of
an ordinary PTP clock in slave mode.
Sync 64 packets/seconds 32 packets/seconds 128 packets/seconds
Delay_Resp 64 packets/seconds 32 packets/seconds 128 packets/seconds
(Duration) 300 seconds 1 second 1000 seconds
Table 27: Support Message Rates for Slave and Master Clock States
Support Message Slave Clock Master Clock
Request Rate Grant Rate
Min Max
Packet
Network
1588v2
Grand
Master
PTP Slave
1588v2
Grand
Master
OSSG737
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