Avaya 03-300430 User Manual

The active/standby state of a Tone-Clock circuit pack may also be determined by looking at its 
LED. A continuously lit red LED on the Tone-Clock circuit pack indicates a reported fault on one 
or more of the maintenance objects on the circuit pack. Flashing patterns of the yellow and 
green LEDs correspond to the following service states: 

1. If the Tone-Clock circuit pack to be replaced is active, then switch to the other Tone-Clock 

circuit pack by the following procedure:

a. set tone-clock location, where location is the physical address of the standby 

Tone-Clock circuit pack.

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-Clock 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.