Alarm Relay Contacts On The Mx480 Craft Interface; Alarm Leds And Alarm Cutoff/Lamp Test Button On The Mx480 Craft Interface - Juniper MX480 Hardware Manual

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Alarm Relay Contacts on the MX480 Craft Interface

The craft interface has two alarm relay contacts for connecting the router to external alarm devices (see
Figure 5 on page 37). Whenever a system condition triggers either the red or yellow alarm on the craft
interface, the alarm relay contacts are also activated. The alarm relay contacts are located on the upper
right of the craft interface.
Figure 5: Alarm Relay Contacts
Alarm LEDs and Alarm Cutoff/Lamp Test Button on the MX480 Craft
Interface
Two large alarm LEDs are located at the upper right of the craft interface. 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.
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 6 on page 38 describes the alarm LEDs and alarm cutoff button in more detail.