Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 239
The PTP algorithm is able to recover the clock using both the upstream and
downstream directions in both ordinary slave and boundary clock modes. The ability
to perform bidirectional clock recovery will improve the performance of networks
where the upstream and downstream load is not symmetrical.
6.4.6.4 PTP Ordinary Slave Clock For Frequency
The PTP ordinary clock with slave capability on the 7705 SAR provides an 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 16 Slave Clock
The PTP slave 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 slave clocks and the 7705 SAR-18 can
support up to eight slave clocks.
All other fixed platforms listed in Table 25 can support up to two PTP clocks when
one of those clock types is configured as transparent; otherwise, they support only
one slave clock.
Each slave clock can provide a separate frequency reference to the SSU.
Figure 17 shows the operation of an ordinary PTP clock in slave mode.
Packet
Network
1588v2
Grand
Master
1588v2
Grand
Master
PTP Slave
21306
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