Nokia 7210 SAS-M - Page 285

7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
System Management
Edition: 01 3HE 16132 AAAB TQZZA 285
The ITU-T profile is for use in environments with only ordinary clock masters and
slaves for frequency distribution. The default profile should be used for all other
cases.
If the profile setting for the clock is g8275dot1-2014, the precedence order for the
best master selection algorithm is very similar to that used with the default profile. It
ignores the priority1 parameter, includes a localPriority parameter, and includes the
ability to force a port to never enter the slave state (master-only). The precedence
is as follows:
• clock class
• clock accuracy
• PTP variance (offsetScaledLogVariance)
•priority2
•localPriority
• clock identity
• steps removed from the grandmaster
The 7210 SAS sets its local parameters as described in Table 37.
Table 36 Local Clock Parameters When Profile is Set to itu-telecom-freq
Parameter Value
clockClass 80-110 – value corresponding to the QL out of the central
clock of the 7210 SAS as per Table 1/G.8265.1
255 – the 7210 SAS is configured as an ordinary clock slave
Table 37 Local Clock Parameters When Profile is Set to g8275dot1-2014
Parameter Value
clockClass 165 – the 7210 SAS is configured as a boundary clock and
the boundary clock was previously locked to a grandmaster
with clock class of 6
248 – the 7210 SAS is configured as a boundary clock
255 – the 7210 SAS is configured as an ordinary clock slave
clockAccuracy FE – unknown
offsetScaledLogVariance FFFF – not computed