Mx2020 Alarm Leds And Alarm Cutoff/Lamp Test Button; Figure 19: Alarm Relay Contacts; Table 21: Alarm Relay Contacts - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
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MX2020 Alarm LEDs and Alarm Cutoff/Lamp Test Button

42

Figure 19: Alarm Relay Contacts

1
M/S CHASSIS NUM
LC
17 18 19
6 SFB 7 CB-RE 1
7 8 LC 9

Table 21: Alarm Relay Contacts

Function No. Label
1 MINOR ALARM–[NC C NO]
MAJOR ALARM–[NC C NO]
Disconnecting the Alarm Relay Wires from the MX2020 Craft Interface on page 283
Connecting the Alarm Relay Wires to the MX2020 Craft Interface on page 282
Two large alarm LEDs are located at the upper right of the craft interface. When lit, the
circular red LED indicates a critical condition that can result in a system shutdown. A lit
triangular yellow LED indicates 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
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 22 on page 43 describes the alarm LEDs and alarm cutoff button in more detail.
Description
The alarm relays consist of three
terminal contacts with a normal
closed (NC), common (C), and
normal open (NO) relays that signal
a minor or major alarm when
broken.
ACO/LT (for "alarm
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