ALM

RED

This LED indicates a media module failure or mismatch, a loss of signal, or a nonfuctional D-Channel. This LED is also turned ON when the media module is inserted and turns OFF after initialization.

TST

GREEN

This LED is turned on during start up, self-testing, and maintenance testing.

ACT

YELLOW

This LED indicates that the clock is synchronized with a source, usually the Central Office. The LED blinks ON for 2.8 seconds and OFF for 300ms.This is the most common condition.

The opposite blinking of the yellow LED is 300 ms ON and 2.8 seconds OFF. This is an error condition, and indicates that the MM710 T1/E1 media module is not synchronized with a clock.

The LED is ON steadily. This is an infrequent occurrence. This indicates in-use activity only when clock synchronization is set to local.

SIG

GREEN

This LED indicates the presence of a valid signal on the T1/E1 line.