![](/images/backgrounds/142068/bg25.png)
One tricolor per port:
■Off—Not enabled
■Green—Online with no alarms or failures
■Amber—Online with alarms for remote failures
■Red—Active with a local alarm; router has detected a failure
LEDs
■Alarm indication signal (AIS)
■Bit error rate test (BERT) functionality on PIC (you can configure one DS3 channel in
BERT mode and configure the remaining channels to transmit and receive normal traffic)
■Equipment failure (does not affect service)
■Far-end block error (FEBE)
■Frame error
■Idle code, Idle received
■Local and remote loopback
■Loss of signal (LOS)
■Out of frame (OOF)
■Parity bit (P-bit) disagreements
■Path parity error
■Yellow alarm bit (X-bit) disagreements
Alarms, errors, and
events
DS3 PIC ■37
DS3 PIC