E1/T1 (PRI) LEDs

Each trunk port provides a LED for indicating operating status, as described in the following table:

E1/T1 LEDs Description

Color	State	Description
Green	On	Trunk is synchronized (normal operation).
Red	On	Loss due to any of the following signals: ■ LOS - Loss of Signal ■ LOF - Loss of Frame ■ AIS - Alarm Indication Signal (the Blue Alarm) ■ RAI - Remote Alarm Indication (the Yellow Alarm)
-	Off	Failure / disruption in the AC power supply or the power is currently not being supplied to the device through the AC power supply entry.