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 pack, always make sure to replace it with
the appropriate Tone-Clock circuit pack for the system. Three circuit pack 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 pack. This will remove the clocks
and cause the system to activate emergency measures:
■ For the PPN Tone-Clock, the system will immediately go 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 operate normally.
2. Insert a new Tone-Clock circuit pack. The system will detect the return of
the clocks and will automatically recover as follows:
■ If the Tone-Clock circuit pack being 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 seconds. Then, all red LEDs of any
Expansion Port Networks will come on and go off within the next 30
seconds.
■ If the Tone-Clock circuit pack being 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 go off within 30 seconds, pull the
circuit pack out and reseat it. If the LEDs perform as expected this time,
continue with step 6. Otherwise, there may be a problem with the TDM
Bus; possibly a bent pin 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 when 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 and Critical Reliability systems). The
Stratum 3 Clock will operate only with this code as the Master Tone-Clock
circuit pack. The TN780 circuit pack is upward compatible with the TN768
code, and can be used in any place a TN768 would be allowed. The
TN780 is used in many countries outside the U.S. where the TN768 does
not provide local tones.
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 country configurations.
