ALM

Red

This LED indicates a media module failure, an incorrect media module in the slot, or the B-Channel is down. This LED is also turned ON when the media module is inserted and must turn OFF after the media module initializes.

TST

Green

This LED is turned ON when power is turned on, self-testing, and maintenance testing.

ACT

Yellow

This LED is turned ON when one or more ports are in use on the media module.