| 摘要 |
In order to be able to achieve a central test unit, even when fuses Si1, Si2 located in the subscriber line wires a, b have blown, via an existing test output UTX of the subscriber connection circuit TSch, high-impedance voltage-proof voltage dividers RT1, RT2; RT3, RT4 whose partial voltage can be selectively connected to the test output are connected on the line side of the fuses. <IMAGE>
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