| 摘要 |
Since transmission between a roadside antenna unit and a roadside apparatus is performed by optical communication wherein a radio frequency is transmitted as an optical signal, the system has undesirably been expensive, and teletransmission has not been offered by the system. Also, there has been another problem that workers have to go to each of the roadside antenna apparatuses installed along a road in order to perform maintenance work of the apparatuses. A baseband signal is used for transmission between the roadside antenna apparatus and the roadside apparatus. A setting tool such as a personal computer is connected to the roadside apparatus so that operations of adjustment/setting of the roadside antenna apparatus are remotely performed with the wetting tool. The baseband signal and the remote control signal are compressed to be transmitted on an ordinary transmission signal.
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