M320 Craft Interface LED Display and Navigation Buttons
A four-line LED display is located in the craft interface, along with six navigation buttons. The LED display operates in two modes:
- LED display idle mode
- LED display alarm mode
During normal operation, the LED display operates in idle mode and reports current status information, as shown in Figure 1.
Figure 1: LED Display in Idle Mode
The lines in the display report the following information:
- First line—Router name.
- Second line—Length of time the router has been running,
reported in the following form:Up days + hours:minutes
- Third and fourth lines—Status messages, which rotate at 2-second intervals. Some conditions, such as removal or insertion of a system component, can interrupt the messages.
To add a message that alternates every 2 seconds with the default status messages, use the set chassis display message command. For more information, see the Junos System Basics and Services Command Reference.
When a red or yellow alarm occurs, the LED display switches to alarm mode and reports about the alarm condition, as shown in Figure 2.
Figure 2: LED Display in Alarm Mode
The lines in the display report the following information:
- First line—Router name.
- Second line—Number of active alarms.
- Third and fourth lines—Individual alarm messages, with the most severe condition shown first. The prefix on each line indicates whether the alarm is a red (R) or yellow (Y) alarm.
For a list of alarm messages that can appear on the LED display, see M320 Chassis and Interface Alarm Messages.
