Alarm LEDs and Alarm Cutoff/Lamp Test Button

Two large alarm LEDs are located at the upper left of the craft interface (see Figure 2). The circular red LED lights to indicate a critical condition that can result in a system shutdown. The triangular yellow LED lights to indicate a less severe condition that requires monitoring or maintenance. Both LEDs can be lit simultaneously.

A condition that causes an LED to light also activates the corresponding alarm relay contact on the connector interface panel (CIP), as described in the T640 Internet Routing Node Hardware Guide or the T1600 Internet Routing Node Hardware Guide . The LCD on the craft interface reports the cause of the alarm, as described in LCD Alarm Mode.

To deactivate red and yellow alarms, press the button labeled ACO/LT (for “alarm cutoff/lamp test”), which is located to the right of the alarm LEDs. Deactivating an alarm turns off both LEDs and deactivates the device attached to the corresponding alarm relay contact on the CIP. However, the LCD continues to report the alarm message until you clear the condition that caused the alarm.

Table 1 describes the alarm LEDs and alarm cutoff button in more detail.

Table 1: Alarm LEDs and Alarm Cutoff/Lamp Test Button