T320 Craft Interface Alarm Leds And Aco/Lt Button; T320 Craft Interface Lcd And Navigation Buttons; Table 10: T320 Alarm Leds And Alarm Cutoff/Lamp Test Button - Juniper T320 Hardware Manual

T320 Core Router Hardware Guide

T320 Craft Interface Alarm LEDs and ACO/LT Button

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T320 Craft Interface LCD and Navigation Buttons

36
Two large alarm LEDs are located at the upper left of the craft interface (see Figure 21
on page 35). 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 connector interface panel (CIP), as described in "T320 Alarm Relay
Contacts" on page 42. The LCD on the craft interface reports the cause of the alarm, as
described in "T320 Craft Interface LCD and Navigation Buttons" on page 36.
To deactivate red and yellow alarms, press the button labeled
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 CIP. However, the LCD continues to report the alarm message until
you clear the condition that caused the alarm.
Table 10 on page 36 describes the alarm LEDs and alarm cutoff button in more detail.

Table 10: T320 Alarm LEDs and Alarm Cutoff/Lamp Test Button

Shape Color
Red
Yellow
—
T320 Chassis Description on page 12
Troubleshooting Using the T320 Craft Interface LEDs on page 128
Replacing a T320 Craft Interface on page 158
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
State Description
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.
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/lamp test button—Deactivates red and
yellow alarms. Causes all LEDs on the craft interface
to light (for testing) when pressed and held.
(for "alarm
ACO/LT
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