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n is 0 or 1 for the slot number of the host subsystem being taken offline.

5. Verify that the control board is offline:

user@host> show chassis environment cb

Documentation

T640 Preventing Electrostatic Discharge Damage on page 506•

• T640 Host Subsystem Description on page 35

• Taking the T640 Host Subsystem Offline on page 307

• Maintaining the T640 Host Subsystem on page 447

• T640 Routing Engine Functions on page 5

• T640 Routing Engine Interface Cable and Wire Specifications on page 145

• T640 Preventing Electrostatic Discharge Damage on page 506

Replacing a T640 LCC-CB

Removing a T640 LCC-CB on page 310

Installing a T640 LCC-CB on page 312

Removing a T640 LCC-CB

The router can have up to two LCC-CBs. They are located in the upper rear of the chassis

in the slots marked CB0 and CB1. Each LCC-CB weighs approximately 5 lb (2.3 kg).

CAUTION: Before you replace an LCC-CB, you must take the host subsystem

offline. If there is only one host subsystem, taking the host subsystem offline

shuts down the router.

The backup LCC-CB is hot-removable and hot-insertable.

CAUTION: If the LCC-CBto be replacedis associated with the RoutingEngine

currently functioning as the master Routing Engine, switch it to the backup

before removing the LCC-CB.

To remove an LCC-CB (see Figure 147 on page 311):

1. Take the host subsystem offline. See Taking the T1600 Host Subsystem Offline .

2. Place an electrostatic bag or antistatic mat on a flat, stable surface.

T640 Core Router Hardware Guide

Juniper T640 Hardware Guide

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