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T640 Craft Interface LCD and Navigation Buttons

 

A four-line LCD is located in the craft interface, along with six navigation buttons. The LCD operates in two modes:

  • LED Idle Mode

  • LED Alarm Mode

During normal operation, the LCD operates in idle mode and reports current status information, as shown in Figure 1.

Figure 1: T640 LCD in Idle Mode
T640 LCD 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:

  • 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 set chassis display message.

When a red or yellow alarm occurs, the LCD switches to alarm mode and reports the alarm condition, as shown in Figure 2.

Figure 2: T640 LCD in Alarm Mode
T640 LCD 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 an overview of alarm messages that can appear on the LCD, see T640 Alarm Messages Overview.