Figure 13: Front Panel of the M120 Craft Interface
Related
Documentation
Installing the M120 Craft Interface on page 131
•
•
M120 Router Chassis Description on page 6
•
Replacing the M120 Craft Interface on page 129
Alarm LEDs and Alarm Cutoff/Lamp Test Button on the M120 Craft Interface
Two large alarm LEDs are located at the upper left of the craft interface (see Figure 13
on page 24). 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 craft interface, as described in “Alarm Relay Contacts on the M120 Craft
Interface” on page 28.
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 craft interface.
Table 8 on page 24 describes the alarm LEDs and alarm cutoff button in more detail.
Table 8: M120 Alarm LEDs and Alarm Cutoff/Lamp Test Button
Description
State
Color
Shape
Critical alarm LED—Indicates a critical condition that
can cause the router to stop functioning. Possible
causes include component removal, failure, or
overheating.
On steadily
Red
Warning alarm LED—Indicates a serious but nonfatal
error condition, such as a maintenance alert or a
significant increase in component temperature.
On steadily
Yellow
Alarm cutoff/lamp test button—Deactivates red and
yellow alarms. Causes all LEDs on the craft interface
to light (for testing purposes), when pressed and
held.
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Copyright © 2010, Juniper Networks, Inc.
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M120 Multiservice Edge Router Hardware Guide
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