Avaya Definity SI, Maintenance Manual, Page: 2576 / 2968

Maintenance Object Repair Procedures
555-233-123 10-1790 Issue 4 May 2002
2. If the Tone-Clock circuit pack to be replaced is active, then switch to the
other Tone-Clock circuit pack by doing the following:
■
set tone-clock PC
—
where PC is the Standby Tone-Clock circuit
pack. Since the system is designed to operate primarily on the
preferred tone clock, the set tone-clock PC command should be
used to make the preferred tone board active when maintenance
activity is completed. There is no preferred tone clock for the PPN,
but carrier A is preferred for EPNs.
■
status system
—
verify the Tone-Clock circuit pack switched to the
other Tone-Clock circuit pack or check the LEDs. The yellow LED of
the new Standby Tone-Clock circuit pack should be off (provided
maintenance is not running on it) and the yellow LED of the active
Tone-Clock circuit pack should be blinking.
Condition
Tone-Clock
Circuit State Explanation
“flashing yellow” 2.7 seconds
on, .3 seconds off active An external timing source is being
used as a synchronization
reference.
1
1 For a Tone-Clock in the master port network, the external source is the primary or
secondary DS1 source, or a Stratum 3 clock. For a Tone-Clzteock in a slave port
network, the external source is the Expansion Interface circuit pack.
“flashing yellow” .3 seconds
on, 2.7 seconds off active The local oscillator on the
Tone-Clock circuit pack is being used
as a synchronization reference.
"yellow" on continuously active The circuit pack has been reset but
has not been told which
synchronization source to use.
"yellow" LED off standby The circuit pack is in standby mode,
(neither generating tones nor
supplying clocks).
“jingle bells” green and yellow
.1 sec on, .2 sec off, .1 sec
on, .4 sec off, .4 sec on, .4
sec off standby Maintenance software is testing the
standby circuit pack (the standby
Tone-Clock is providing tones).
“double blink yellow” .3 sec
on, .3 sec off, .3 sec on, 2.4
sec off active TN2182 has lost all external
references and is in holdover mode.
"other green and yellow
patterns" active Maintenance software is testing the
active circuit pack.
random yellow standby If the circuit pack is a TN2182, the
yellow LED may come on and off
intermittently as ETR-PTs on the
board are used for tone detection
services.