Connecting the T640 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 CIP. 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 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 28-AWG and 14-AWG (0.08
and 2.08 mm
2
).
2. Attach an electrostatic discharge (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 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.
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 2.5-mm flat-blade 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
Overview of Connecting the T640 Router to External Devices on page 209•
• T640 Routing Engine Interface Cable and Wire Specifications on page 145
• Tools and Parts Required to Connect the T640 Router to External Devices on page 210
Copyright © 2017, Juniper Networks, Inc.214
T640 Core Router Hardware Guide
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