| 摘要 |
A time slot interchange apparatus for a maintenance dedicated line of a signal transmission system, capable of utilizing effectively the orderwire line having only one line and of avoiding a crosstalk, data error or the like, has switching units for on/off switching the line at both sides of each of the signal transmission stations, and a control circuit which controls the on/off switching of the switching units, so that, at calling in, the opposite line is made to be off and, at calling out, the line opposite to the calling station is made to be off.
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