LEDs, indicators, and office alarms

SYSCTL faceplate

In addition to the FAULT LED, which is lit if the SYSCTL detects its own failure, there are also three alarm/status LEDs on the SYSCTL faceplate, listed below:

• Critical (CR)/Major (MJ)

• Minor (MN)/Abnormal (ABN)

There are LEDs and two push-button switches for Update (UPDATE) and ACO (ACO).

Equipment indicators

A red LED FAULT indicator is provided on all circuit packs. A green LED ACTIVE indicator is provided on all circuit packs to indicate which circuit packs are actively carrying traffic.

Office alarms

The office alarms interface is a set of discrete relays that control office audible and visual alarms. Separate relays handle CR/MJ (both critical and major alarms are reported through one pair of relays) and MN alarms. Each contact closure is rated at 1 A, 60 V maximum. The CR alarm relays are fail safe against unprotected power failures.