Installing The T4000 Alarm Relay Wires; Replacing A T4000 Scg; Removing A T4000 Scg - Juniper T4000 Hardware Manual

T4000 Core Router Hardware Guide

Installing the T4000 Alarm Relay Wires

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Replacing a T4000 SCG

Removing a T4000 SCG

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To connect replacement wires to an alarm-reporting device:
Prepare the required length of replacement wire with a gauge between 28 AWG and
1.
14 AWG (0.08 and 2.08 mm
Plug the terminal block into the relay contact, and use a 2.5-mm flat-blade screwdriver
2.
to tighten the screws on the face of the block.
Attach the other end of the wires to the external device.
3.
T4000 Connector Interface Panel (CIP) Description on page 14
Connecting the T4000 Router to an External Alarm-Reporting Device on page 182
T4000 Alarm Relay Contact Wire Specifications on page 114
Removing a T4000 SCG on page 256
1.
Installing a T4000 SCG on page 257
2.
The router can have one or two SCGs installed. The SCGs are located in the upper rear
of the chassis, above the control boards and Routing Engines. Each SCG weighs
approximately 1.9 lb (0.9 kg).
A nonredundant SCG is hot-pluggable. For redundant SCGs, the master SCG is
hot-pluggable. The backup SCG is hot-removable and hot-insertable if the master SCG
is functioning. Removing the backup SCG does not affect the functioning of the router.
Taking the master SCG offline might result in a brief loss of SONET clock lock while the
backup SCG becomes the master.
To remove an SCG (see Figure 94 on page
Place an electrostatic bag or antistatic mat on a flat, stable surface.
1.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis.
Press the online/offline button on the SCG faceplate, and hold it down until the LED
3.
goes out (about 5 seconds).
Loosen the captive screws on the edges of the SCG faceplate.
4.
2
).
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