| 摘要 |
A voltage supply unit is provided for a communication system provided with a network including a transmission path that consists of a main line and plural branch lines, which are formed as a differential two-wire type of transmission line consisting of first and second communion lines. This unit comprises a DC voltage source and an application device. The DC voltage source outputs a specified voltage different from a reference voltage of the transmission path. The application device applies, to the transmission path, the specified voltage in response to a command to be given. The unit is provided in a fault diagnosis apparatus or a node connected to the communication system. The specified voltage disables communication of only a certain node and to allow the remaining nodes to communicate with each other. In the certain node, an electrical disconnection is caused in either the first and second communications.
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