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NOTE: When you bring an active SIB offline, the spare SIB becomes active

and transitions to the Online state.

3. Replace the SIB with a standard SIB version B. Use the replacement procedures

described in “Removing a T640 Standard SIB or Standard SIB Version B” on page 425

and “Installing a T640 Standard SIB or Standard SIB Version B” on page 426

NOTE: Ensure that the ejector handle tabs are properly mated inside their

corresponding chassis slots before you tighten the captive screws on the

ejector handles.You might have to closeand open the handlesa few times

before the tabs catch the slots.

Documentation

T640 Chassis Description on page 15•

• T640 Switch Interface Boards (SIBs) Description on page 111

• Maintaining the T640 SIBs on page 459

Replacing a T640 XENPAK Module

XENPAK modules are optical transceivers that can be removed from a PIC.

XENPAK modules are hot-insertable and hot-removable. Removing a XENPAK module

does not interrupt PIC functioning, but the removed module no longer receives or transmits

data.

Removing a T640 XENPAK Module on page 434

Installing a T640 XENPAK Module on page 436

Removing a T640 XENPAK Module

To remove a XENPAK module (see Figure 230 on page 436):

1. Place an electrostatic bag or antistatic mat on a flat, stable surface to receive the

XENPAK module. Have ready a rubber safety cap for the XENPAK transceiver and the

cable.

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. Label the cable connected to the XENPAK module so that you can later reconnect it

to the correct module.

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