DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1783TONE-BD (Tone-Clock Circuit Pack)
9
When replacing the Tone-Clock circuit pa ck, always make sure to replace it with
the appropriate Tone-Clock circuit p ack for the system. Three circuit pac k codes
are supported by G3r systems:
Port Networks with a Single Tone-Clock Circuit Pack:
This procedure is destructive.
1. Pull out the defective Tone-Clock circuit pac k. This will remove the clocks
and cause the system to ac tivate emergency measures:
■For the PPN Tone-Clock, the system will immediately g o into the
Emergency Transfer state.
■For an EPN Tone-Clock, all calls to and from the EPN will drop and
the EPN will activate Emergency Transfer within about one minute,
but the rest of the system should op erate normally.
2. Insert a new Tone-Clock circuit pack. The system will detec t the return of
the clocks and will automatic ally recover as follows:
■If the Tone-Clock circuit pack bein g replaced is in the Processor
Port Network, the system will perform a reset system 2 (system
cold 2 restart) automatically. First, all red LEDs of the PPN will
come on and off within 30 second s. Then, all red LEDs of any
Expansion Port Networks will come on and g o off within the next 30
seconds.
■If the Tone-Clock circuit pack bein g replaced is in an Expansion
Port Network, the system will reset the EPN (EPN cold restart) and
all the red LEDs of the EPN will come on and go off within 30
seconds.
3. If the red LEDs come on but do not g o off within 30 seconds, pul l the
circuit pack out a nd reseat it. If the LEDs perform as expe cted this time,
continue with step 6. Otherwise, there may b e a problem with the TDM
Bus; possibly a bent p in in the Tone-Clock circuit pack slot. Follow the
directions in the TDM-BUS maintenance section.
TN768 This is the general purpose Tone-Clock circuit pack for port networks on a
G3r switch. It can be used in every situation except as the Master
Tone-Clock circuit pack wh en a Stratum 3 Clock is administered .
TN780 The Stratum 3 Clock feature requires the use of this circuit pack code for
the PPN (in both carriers of High an d Critical Reliability sy stems). The
Stratum 3 Clock will operate only with this code as the Master Tone-Clock
circuit pack. The TN780 circuit pack is upward comp atible with the TN768
code, and can be used in any plac e a TN768 would be allowed. The
TN780 is used in many countries outside the U.S. where the TN768 does
not provide local ton es.
TN2182 This Tone-Clock-Detector may be used anywhere a TN768 or TN780 is
used with the exception of configurations requiring Stratum 3 Clock. The
TN2182 may be used in all cou ntry configurations.