Installing A T640 Scg; Figure 110: Removing An Scg; Figure 111: Installing An Scg - Juniper T640 Hardware Manual

Installing a T640 SCG

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Copyright © 2010, Juniper Networks, Inc.

Figure 110: Removing an SCG

To install a replacement SCG (see Figure 111 on page 211):
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Carefully align the sides of the SCG with the guides in the SCG slot.
2.
Grasp the SCG by its handle, and slide it straight into the chassis until it contacts the
3.
midplane.
Tighten the captive screws on the corners of the SCG faceplate.
4.
To bring the SCG online, press the online/offline button until the green
5.
To verify that the SCG is installed correctly and is functioning normally, check the
6.
LEDs on the SCG faceplate. The green
master, the blue
MASTER
To check the status of the SCGs, use the following CLI command:
user@host> show chassis environment scg
For more information about using the CLI, see the Junos OS manuals.

Figure 111: Installing an SCG

T640 Standard SONET Clock Generators (SCGs) Description on page 40
T640 SONET Clock Generators (SCGs) LEDs on page 41
Maintaining the T640 SCGs on page 150
Chapter 17: Replacing T640 Router Hardware Components
LED should light steadily. If the SCG is
OK
LED should also light steadily.
LED lights.
OK
211