![](/images/backgrounds/142068/bg19.png)
■Alarm indication signal (AIS)
■Loss of frame (LOF)
■Out of frame (OOF)
■Failed signal rate (FSR)
Alarms, errors, and
events
■Layer 2 per-queue and per-channel packet and byte countersInstrumentation
(counters)
Channelized E1 IQ PIC ■25
Channelized E1 IQ PIC