LEDs, indicators, and office alarms

LNW2 SYSCTL faceplate

The LNW2 SYSCTL circuit pack faceplate contains the following push-button switches and LEDs:

• ACTIVE LED

• FAULT LED

• Critical (CR) LED

• Major (MJ) LED

• Minor (MN) LED

• Abnormal (ABN) LED

• Far End Activity (FE) LED

• Near End Activity (NE) LED

• Alarm Cut-Off/Test (ACO) LED

• ACO/TEST (ACO SW) button

• Select (SEL) button

• Update/Initialize (UPD INIT) button

• alphanumeric LED display

The alphanumeric LED numeric display is used to identify the remote system presently displayed on the local user panel.

A green PWR ON LED is lighted when the shelf is receiving −48 V power. A green ACO LED is lighted when the ACO function is active.

The SEL, ACO SW, and UPD INIT push-buttons are provided to control system operation.

Equipment indicators

A red LED FAULT indicator is provided on all circuit packs. A green LED ACTIVE indicator is provided on all 1x1 protected 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, and MN alarms. Each contact closure is rated at 1 A, 60 V maximum. The CR and MJ alarms can be wire-ORed. The CR alarm relays are fail safe against unprotected power failures.