Avaya Definity SI, Руководство по обслуживанию, Страница: 2574 / 2968

Maintenance Object Repair Procedures
555-233-123 10-1788 Issue 4 May 2002
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.
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]