Huawei BTS3900C - Checking the DIP Switches

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Socket for the ESD wrist
strap on the OMB
Check the DIP switch on the WMPT.
Check the DIP switch on the UELP.
Wear the ESD wrist strap or gloves before removing or installing a
board.
Checking the DIP Switches
75-ohm E1 Mode
120-ohm E1 Mode
T1 mode
75-ohm E1
Unbalance mode
Other mode