Avaya 03-300430 User Manual

The output of the CI and PAI cards go directly to the TN780 Tone-Clock circuit pack via two 
25-pair amphenol terminated cables. Every card has red and/or green LEDs for providing status 
or alarm indications. The abbreviations used in the table are defined above except for SRC 
(source) and PLL (Phase Locked Loop).

PAI

REF A

Red

Loss of input reference A or CI A failed

REF B

Red

Loss of input reference B or CI A failed

ST A

Red

Failed Stratum-3 clock A

ST B

Red

Failed Stratum-3 clock B

PWR A

Green

-48VDC A present

PWR B

Green

-48VDC B present

CI

FAIL

Red

Card failure

DS1

Green

DS1 source present

CC

Green

Composite clock source

1

 present

1. Composite Clock (CC) source refers to the protocol used to electrically transfer timing 

from the Stratum-3 clock to the switch. The Composite Clock source is not relevant to the 
system.

SRC 

ACTIVE

Green

Card is currently on-line

ST3

FAIL

Red

Card failure

LOCK

Red

PLL lost sync with reference or holdover 

mode

REF A

Red

Timing Reference from CI A

REF B

Red

Timing Reference from CI B

TOC

FAIL

Red

Card failure

PORT ALM

Red

Output port alarm (one or more)

ST

Green

Reference present from ST clock

INPUT

Green

Reference present from CI

500’

Green

500-foot phase advance

1000’

Green

1000-foot phase advance