System Management
238
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
The performance objective is to meet the synchronization interface maximum time
interval error (MTIE) mask. Similar to ACR, the number of factors with the PSN will
contribute to how well PTP can withstand, and still meet, those requirements.
6.4.6.3 PTP Capabilities
PTP messages are supported via IPv4 unicast with a fixed IP header size.
Table 27 describes the supported message rates for slave and master states for IP-
encapsulated PTP traffic, based on the profile configured. The ordinary clock can be
either in the slave or master state. The boundary clock can be in both of these states.
Note:
1. In the master clock state, the minimum rate granted is 1 per 16 seconds if requested by the slave
clock.
See Table 29 for the supported message rates for Ethernet-encapsulated PTP
traffic.
State and statistics data for each master clock are available to assist in the detection
of failures or unusual situations.
Note:
• The grand master clock is the master clock for the network. The best master clock is
the clock that the slave clock selects as its master. For example, the slave clock’s best
master clock might be a boundary clock, which is connected to a grand master clock.
• A 7705 SAR equipped with a GNSS receiver can function as a grand master clock.
Table 27 Rates for IP-Encapsulated PTP Messages
ieee1588-2008 itu-telecom-freq g8275dot1-2014
Announce Minimum rate 1 per 16 seconds 1 per 16 seconds 1 per 16 seconds
Maximum rate 8 per second 8 per second 8 per second
Default rate 1 per 2 seconds 1 per 2 seconds 8 per second
Sync and
Delay
Minimum rate
1
16 per second 16 per second 16 per second
Maximum rate 128 per second 128 per second 128 per second
Default rate 64 per second 64 per second 16 per second
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