DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures

9-1721TDM-CLK (TDM Bus Clock)

9

See “Synchronization” for more details of th e escalation plan.

There exists a strong interdepend ency among the DS1 Interface c ircuit pack Maintenanc e, Synchronization Maintenance, and TDM Bus Cloc k Maintenance MOs
.

See the section on “TONE-BD” for a discu ssion of the relationship of Tone-Clock

circuit packs wi th 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
Second ary DS1 Primar y DS1 Seco ndar y
DS1 Primary Only DS1 Primary None
No External Source None None
SLAVE
PNC Duplication Active EI Standby EI
No PNC
Duplication Active EI None