Marconi OMS 1200
Technical Product Description
221 02-ZAP 701 25/1 Rev C 2006-08-04
© Ericsson AB 2006
03PHB00004AAV-CUA
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6.3 Timing
Marker
Operation
The quality level of a timing source is normally determined from the received SSMB
timing markers or by Operator configuration. An operator can choose to ignore the
received timing markers on a ‘global’ basis, and select timing sources by priority only if
timing marker operation is disabled. When disabled the "Default SSMB" code shall be
transmitted on all outputs supporting SSMB.
Timing marker operation is used to eliminate problems associated with
synchronisation timing loops. The configurable destination ID description for
interconnecting STM-n interfaces are compared, and a ‘do not use’ SSMB marker is
set to downstream NEs if they are found to be the same.
Note:
Default: - Timing Marker Enabled.
6.3.1 Destination
ID
The destination ID for each STM-n can be configured. This is a text string of up to 52
characters. The SSMB associated with the interface can also be overwritten.
Note:
Default: - card and port ID (e.g. Line East A).
6.4 Revertive/Non-revertive
Operation
The equipment may be configured for revertive or non-revertive operation.
Note:
Default: - Revertive.
6.5
Wait to Restore Period
A wait-to-restore period is entered following restoration of a failed source, before the
quality level is returned to the original value or becomes available. When timing
marker operation is enabled, a change in SSMB value does not initiate a
wait-to-restore period. The wait-to-restore period can be set from zero to 30 minutes
(in 30-second increments).
Note:
Default: - 1 minute.
6.6 Priority
Table
Options
In SETG mode, you can configure two priority tables, one for equipment clock sink
and one for external output sink.
Assigning a clock source to a priority table defines it as a nominated source. The
entries may be chosen from any of the sources listed in Table 6-1, Table 6-2, Table
6-3 & Table 6-4.
