Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 235
• clock identity
• distance (number of boundary clocks)
If the profile setting for the clock is itu-telecom-freq (ITU-T G.8265.1 profile), the
precedence order for the best master selection algorithm is as follows:
• clock class
•peer ID
If the profile setting for the clock is g8275dot1-2014, the precedence order for the
best master selection algorithm is as follows if the grand master clock is connected
to a primary reference time clock (PRTC) in locked mode:
• clock class
• clock accuracy
• PTP variance (offsetScaledLogVariance)
• priority2 (user-configurable on the master clock side)
•localPriority
• steps removed from the grand master
• port identities
• port numbers
If the profile setting for the clock is g8275dot1-2014, the precedence order for the
best master selection algorithm is as follows if the grand master clock is in holdover
and out of holdover specification, or is without a time reference since startup:
• clock class
• clock accuracy
• PTP variance (offsetScaledLogVariance)
• priority2 (user-configurable on the master clock side)
•localPriority
• clock identity
• steps removed from the grand master
• port identities
• port numbers
Figure 14 shows an example of the messaging sequence between the PTP slave
clock and the two PTP master clocks.
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