Black Box MWU2000-X21 - Manual (Page 123)

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2.048Mbps Wireless Modem
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Figure C-2. Fractional E1 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 upper side of the LIU board shown in Figure C-3.
3. Set the jumpers according to diagrams C-3 to C-4.