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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1485TONE-BD (Tone-Clock Circuit Pack)
10
When replacing the Tone-Clock circuit pack, always replace it with a comparable
Tone-Clock circuit pack for the system. See the following table:
■ TN768—This is the general purpose Tone-Clock circuit pack for port
networks on a G3i 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.
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
System Type
Tone-Clock Circuit Pack
Code
One-port network single-carrier cabinet
system without High or Critical Reliability.
TN756, TN768, TN780 TN2182
[G3iV4-386]
One-port network system without High or
Critical Reliability (multicarrier cabinet).
TN768, TN780
Two-port network single-carrier cabinet
system without High or Critical Reliability.
TN768, TN780 TN2182
[G3iV4-386]
One- or two-port network without High or
Critical Reliability.
TN768, TN780 TN2182
[G3iV4-386]