Hardware Component Overview
Craft Interface
19
Table 6 describes the alarm LEDs and alarm cutoff button in more detail.
Table 6: Alarm LEDs and Alarm Cutoff Button
LCD
A four-line LCD is located in the center part of the craft interface, next to six navigation
buttons (see Figure 7). The LCD operates in two modes:
Idle mode—Reports current system status during normal operation.
Alarm mode—Reports alarm conditions when the red or yellow alarm LED is lit. For a
list of alarm messages that can appear on the LCD, see “Hardware and Interface Alarm
Messages” on page 192.
Routing Engine LEDs and Interface Ports
The area labeled
ROUTING ENGINE
at the right side of the craft interface contains Routing
Engine status LEDs and three ports for connecting the Routing Engine to external devices on
which system administrators can issue JUNOS command-line interface (CLI) commands to
manage the router.
The green LED labeled
OK
and red LED labeled
FAIL
indicate Routing Engine status, as
described in Table 7.
Table 7: States for Routing Engine LEDs
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.
ALARM
CUTOFF
Label
Shape
Color
State
Description
OK
Green
On steadily
System Control Board detects presence of the Routing
Engine.
Blinking
Routing Engine is starting up.
FAIL
Red
On steadily
Routing Engine is not operational, or System Control
Board does not detect its presence.
