Avaya 03-300430 User Manual

The T1/E1 Media Module has four LEDs on its faceplate (see 

on page 297 shows their color and functions. The 

first three are the standard LEDs, which are under software control.

ALM

RED

Top

Upon power-up, this LED is turned on. Upon passing 

diagnostics this LED is turned off. During normal circuit pack 

operation this LED is not turned on except for certain alarm 

states.

TST

GREEN

Second

During power-up self-testing and maintenance testing 

requested by the SPE, this LED is turned on.

ACT

YELLOW Third

This LED indicates that the clock is synchronized with a 

source (usually the Central Office). The LED is blinking 2700 

ms ON and 300 ms OFF. This is the most common condition.

The opposite blinking of the YELLOW LED is 300 ms ON and 

2700 ms OFF. This is an error condition, and indicates that 

the MM710 T1/E1 Media Module is not synchronized with a 

clock.

An infrequent occurrence is a steady YELLOW LED. This 

indicates in-use activity, only when clock synchronization is 

set to local.

SIG

GREEN

Bottom

This LED indicates whether the link to the Central Office (CO) 

is up (equivalent to the TN464 circuit pack Status 3 GREEN 

E1/T1

EIA 530A DCE

ALM
TST
ACT
SIG

EI

SO

EM

SM

EO

SI

mmdc710 KLC 020402