7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
Figure 22: Logical model of synchronization reference selection on 7210 SAS
On the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, and 7210 SAS-T, in addition to PTP and SyncE
references, the recovered clock can be configured to derive the timing (frequency reference) from the BITS
interface.
When quality Level (QL) selection mode is disabled, the reversion setting controls when the central clock
can reselect a previously failed reference.
The following table lists the selection followed for two references in both revertive and non-revertive
modes.
Table 29: Revertive, non-revertive timing reference switching operation
Status of reference
A
Status of
reference B
Active reference non-
revertive case
Active reference
revertive case
OK OK A A
Failed OK B B
OK OK B A
OK Failed A A
OK OK A A
Failed Failed holdover holdover
OK Failed A A
3HE 18197 AAAB TQZZA
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