Connecting the M120 Router to an External Alarm-Reporting Device
To connect the router to external alarm-reporting devices, attach wires to the RED ALARM
and YELLOW ALARM relay contacts on the craft interface. A system condition that triggers
the red or yellow alarm LED on the craft interface also activates the corresponding alarm
relay contact.
The terminal blocks that plug into the alarm relay contacts are supplied with the router.
They accept wire of any gauge between 28-AWG and 14-AWG (0.08 and 2.08 mm
2
),
which is not provided. Use the wire gauge appropriate for the external device you are
connecting.
To connect an external device to an alarm relay contact (see Figure 53 on page 159):
1. Prepare the required length of wire with gauge between 28-AWG and 14-AWG (0.08
and 2.08 mm
2
).
2. While the terminal block is not plugged into the relay contact, use a 2.5-mm flat-blade
screwdriver to loosen the small screws on its side. With the small screws on its side
facing left, insert wires into the slots in the front of the block based on the wiring for
the external device. Tighten the screws to secure the wire.
3. Orient the terminal block according to the labels to the left of the appropriate relay
contact (NC means “normally closed, C means “common,” and (NO means “normally
open”).
4. Plug the terminal block into the relay contact and use a 2.5-mm flat-blade screwdriver
to tighten the screws on the face of the block.
5. Attach the other end of the wires to the external device.
Copyright © 2018, Juniper Networks, Inc.158
M120 Multiservice Edge Router Hardware Guide
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