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Figure B-2. E1/T1 Board Location
To access the jumpers:
1. Disconnect all cables, including the power cable, from the unit.
2. Loosen and remove the two screws on the rear panel. Carefully slide out the boards. The
jumpers are located at the bottom side of the LIU board shown in Figure B-3.
3. Turn the boards over, loosen and remove the three screws connecting the LIU board to the
main board.
4. Unscrew and remove the nuts and the spring washers from the Tx and Rx connectors. For
easier removal of the LIU board, unscrew the small metal panel holding the LIU connectors.
5. Carefully separate the LIU board from the main board, taking care not to damage the P1
and P2 pins.
6. Set the jumpers according to diagrams B-3 to B-5.