Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 241
6.4.6.5 PTP Ordinary Master Clock For Frequency
The 7705 SAR supports the PTP ordinary clock in master mode. Normally, a 1588v2
grand master is used to support many slaves and boundary clocks in the network. In
cases where only a small number of slaves and boundary clocks exist and only
frequency is required, a PTP integrated master clock can greatly reduce hardware
and management costs to implement PTP across the network. It also provides an
opportunity to achieve better performance by placing a master clock deeper into the
network, as close to the slave clocks as possible.
Figure 18 shows a PTP master clock network configuration.
Figure 18 PTP Master Clock
The PTP master clock capability is implemented on the Ethernet ports of the
platforms listed in Table 25 and on the cards listed in Table 26.
The 7705 SAR-8 can support up to six master clocks and the 7705 SAR-18 can
support up to eight master clocks. The fixed platforms listed in Table 25 can each
support one master clock.
Figure 19 shows the operation of an ordinary PTP clock in master mode.
Packet
Network
PRC
21310
PTP Slave
PTP Slave
PTP Slave
PTP Master
Clock
TDM/SyncE
Network
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