TDM-CLK (TDM Bus Clock)
Issue 1 May 2002
8-1605555-233-143
See ‘‘SYNC (Port-Network Synchronization)’’ on page 8-1509 for more details
about the escalation plan. There is a strong interdependency among the DS1
Interface circuit pack’s Maintenance, Synchronization Maintenance, and TDM Bus
Clock Maintenance MOs.
See ‘‘TONE-BD (Tone-Clock Circuit)’’ on page 8-1659 for a discussion of the
relationship of Tone-Clock circuits with the various reliability options.
Tone-Clock
Role
Synchronization
Facilities
Initial External
Synchronization
Source
Backup External
Synchronization
Source
Internal
Source
MASTER Stratum-3 clock Source “A” Source “B” Local
oscillator
DS1 Primary and
Secondary
DS1 Primary DS1 Secondary
DS1 Primary Only DS1 Primary None
No External Source None None
SLAVE PNC Duplication Active EI Standby EI
No PNC Duplication Active EI None
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