Replacing The Firmware
1. With the DXPT1 board still at your static-safe work area and with your static discharge wrist strap on your
bare wrist and properly grounded, replace the chip-set firmware with the ISDN–PRI firmware.
2. Locate the current chip firmware (U5 at the upper rear of the board—see the illustration), and note its
orientation in its socket.
3. Use a chip extraction tool to lift the chip free from its socket.
4. Remove the replacement chip from its static protection bag and orient it to match the orientation of the chip
that you just removed.
5. Press the chip into place in the socket.
CAUTION
Do not bend any of the chip’s pins so that they do not make contact with the socket.
6. Inspect the modified DXPT1 board for proper installation, and return it to its static protection bag.
7. Refer to the paragraph titled, Installing The T1/PRI Line Board, and re-install the modified DXPT1 board in
the system.
8. Store your old firmware in a static-safe environment in the event that you may need it in the future.
DXPT1
Board
DXPRI Card
ISDN2.cdr
Firmware
Location
(Chip U5)
Installing The DXPRI Card And ISDN–PRI Firmware
Installing And Programming The DXPRI Card
IMI89–255
Up-Grading Your DXPT1 Board For ISDN–PRI Support – 41