Juniper Networks M20 - Manual (Page 18)

■ Single-mode fiber
■ Duplex SC/PC connector (RX and TX)
Cables and connectors
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 Signal Degrade (BERR-SD), Bit Error Rate Signal Fail (BERR-SF)
■ Bit Error Rate Testing (BERT) per E1 channel
■ Bit Interleaved Parity Errors B1, B2, B3 (CV-S, CV-L, CV-P)
■ Loss of Frame (LoF), Loss of Pointer (LoP-P), Loss of Signal (LoS)
■ Payload Mismatch (PLM-P), Payload Unequipped (UNEQ-P)
■ Remote Defect Indication (RDI-L, RDI-P)
■ Errored Seconds (ES-S, ES-L, ES-P), Severely Errored Framing (SEF), Severely Errored
Framing Seconds (SEFS-S), Severely Errored Seconds (SES-S, SES-L, SES-P), Unavailable
Seconds (UAS-L, UAS-P)
■ Yellow alarm bit (X-bit) disagreements
Alarms, errors, and
events
18 ■ Channelized STM1 to E1 PIC
M20 Internet Router PIC Guide: End-of-Life PICs