SEFRAM MW9520, Instruction Manual

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(b) The dead line connection:
Connect the both terminals of MW9520-E to
the two ends of wires in the line, and connect
the wires together on the other end of line. In
another method, connect the both terminals
of MW9520-E to the two ends of a single line.
In this case, the MW9520-R can find out NG
position or trace the signal line in the wall or
floor.