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.

1. Removing a T640 XENPAK Module
2. Installing a T640 XENPAK Module

Removing a T640 XENPAK Module

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.
4. Disconnect the cable from the XENPAK module. Immediately cover the transceiver and the end of the cable with a rubber safety cap.

   Warning: Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

   Caution: Do not leave a fiber-optic transceiver uncovered except when inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

5. Arrange the cable in the cable management system to prevent it from dislodging or developing stress points. Secure the cable so that it is not supporting its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop in the cable management system. Placing fasteners on the loop helps to maintain its shape.

   Caution: Avoid bending fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

6. Unscrew the thumbscrews at the top and bottom of the XENPAK module.
7. Slide the module out of the PIC and place it in the electrostatic bag or on the antistatic mat.

Figure 1: Removing a XENPAK Module

Installing a T640 XENPAK Module

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
2. Verify that a rubber safety cap covers the XENPAK transceiver. Install one if necessary.
3. Orient the XENPAK module so that the optical port faces out, and the transmit (TX) port is above the receive (RX) port (see Figure 2).
4. Slide the XENPAK module into the slot.
5. Tighten the thumbscrews at the top and bottom of the XENPAK module. Verify that the module is seated properly.
6. Remove the rubber safety cap from the transceiver and the end of the cable. Insert the cable into the transceiver.

   Warning: Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

   Caution: Do not leave a fiber-optic transceiver uncovered except when inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

7. Arrange the cable in the cable management system to prevent the cable from dislodging or developing stress points. Secure the cable so that it is not supporting its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop in the cable management system. Placing fasteners on the loop helps to maintain its shape.

   Caution: Do not let fiber-optic cable hang free from the connector. Do not allow fastened loops of cable to dangle, which stresses the cable at the fastening point.

   Caution: Avoid bending fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

8. Verify that the status LEDs on the PIC faceplate indicate that the XENPAK module is functioning correctly. For more information about the PIC LEDs, see the T640 Core Router PIC Guide . You can also verify PIC functioning by issuing the show chassis fpc pic-status command.

Figure 2: Installing a XENPAK Module