Juniper MX104 - Connecting Interface Cables to MX104 Routers

To connect the router to external alarm-reporting devices, attach wires to the ALARM
relay contacts on the front panel of the router. A system condition that triggers the red
or yellow alarm on the router 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 20 AWG (0.52 mm
2
) and 14 AWG (2.08 mm
2
),
which is not provided. Use the gauge of wire appropriate for the external device you are
connecting.
To connect an external device to an alarm relay contact:
1. Prepare the required length of wire with gauge between 20 AWG (0.52 mm
2
) and 14
AWG (2.08 mm
2
).
2. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
ESD points on the chassis.
3. While the terminal block is not plugged into the relay contact, use a 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.
4. 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”).
5. Plug the terminal block into the relay contact and use a screwdriver to tighten the
screws on the face of the block.
6. Attach the other end of the wires to the external device.
If attaching a reporting device for the other kind of alarm, repeat the procedure.
Related
Documentation
MX104 Alarm Contact Port Overview on page 9•
• MX104 Alarm Contact Port Specifications on page 87
Connecting Interface Cables to MX104 Routers
To connect the physical interfaces to the network (see Figure 34 on page 126):
1. Have ready a length of the type of cable used by the component. For MIC cable
specifications, see the MX Series Interface Module Reference.
2. Remove the rubber safety plug from the cable connector port.
125Copyright © 2017, Juniper Networks, Inc.
Chapter 16: Connecting the MX104 Router to the Network