Connecting The Alarm Relay Wires To The Mx2020 Craft Interface; Figure 179: Alarm Relay Contacts; Table 95: Alarm Relay Contacts On The Craft Interface - Juniper MX2020 Hardware Manual

Connecting the Alarm Relay Wires to the MX2020 Craft Interface

Copyright © 2015, Juniper Networks, Inc.
Using a 2.5 mm flat-blade screwdriver, loosen the small screws on the face of the
3.
terminal block and remove the block from the relay contact.
Using the 2.5 mm flat-blade screwdriver, loosen the small screws on the side of the
4.
terminal block. Remove existing wires from the slots in the front of the block (see
Table 90 on page 283).

Figure 179: Alarm Relay Contacts

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

Table 95: Alarm Relay Contacts on the Craft Interface

Function No.
1
To connect the alarm relay wires between a router and an alarm-reporting device (see
Figure 140 on page 282):
Prepare the required length of replacement wire with gauge between 28 AWG and 14
1.
AWG (0.08 and 2.08 mm
Insert the replacement wires into the slots in the front of the block (see
2.
Table 89 on page 282). Use a 2.5 mm flat-blade screwdriver to tighten the screws and
secure the wire.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
3.
the strap to one of the ESD points on the chassis.
Plug the terminal block into the relay contact, and use a 2.5 mm flat-blade screwdriver
4.
to tighten the screws on the face of the block.
Attach the other end of the wires to the external device.
5.
Label Description
The alarm relays consist of three
MINOR ALARM—[NC C
terminal contacts with a normal closed
NO]
(NC), common (C), and normal open
MAJOR ALARM—[NC C
(NO) relays that signal a minor or major
NO] alarm when broken.
2
).
Chapter 25: Replacing Components
423