Alarm Relay Contacts, LEDs, and Cutoff Button

The area labeled ALARM at the left side of the craft interface contains two alarm LEDs and relay contacts, and the alarm cutoff button (see Figure 7). The circular LED, labeled RED ALARM, lights to indicate a critical condition that can result in a system shutdown. The triangular LED, labeled YELLOW ALARM, lights to indicate a less severe condition that requires monitoring or maintenance. Both LEDs can be lit simultaneously. The LCD on the craft interface reports the cause of the alarm.

To the left of the LEDs are the corresponding relay contacts for connecting the router to external alarm-reporting devices. A system condition that causes the red or yellow alarm LED to light on the craft interface also activates the corresponding alarm relay contact. For instructions for attaching a device to the alarm relay contacts, see Connect to an External Alarm-Reporting Device.

To deactivate red and yellow alarms, press the button labeled ALARM CUTOFF, 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. However, the LCD continues to report the alarm message until you clear the condition that caused the alarm.

Table 6 describes the alarm LEDs and alarm cutoff button in more detail.

Table 6: Alarm LEDs and Alarm Cutoff Button

Shape	Color	State	Description
	Red	On steadily	Critical alarm LED—Indicates a critical condition that can cause the router to stop functioning. Possible causes include component removal, failure, or overheating.
	Yellow	On steadily	Warning alarm LED—Indicates a serious but nonfatal error condition, such as a maintenance alert or a significant increase in component temperature.
	—	—	Alarm cutoff button—Deactivates red and yellow alarms and reset timers for system maintenance alerts.