| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow a telephone terminal to monitor whether or not a relay amplifier is normally in operation, which is used to get rid of a dead band of a portable telephone system, without a charge. SOLUTION: The system consists of a monitored device that is provided with a 1st antenna 2, a 2nd antenna 3 installed in a dead zone, a relay amplifier means 1 that is connected between them and has an amplifier means, and a portable telephone terminal 4 that connects to the relay amplifier means 1 and is installed in a zone where the portable telephone service is available, and of a monitor that is provided with a wired telephone terminal 7 connecting to a public circuit network 6 and makes a speech with the portable telephone terminal 4 and a control means 8 that makes call control for the portable telephone terminal 4 on behalf of the wired telephone terminal 7 and confirms a reply call signal based on this call.</p> |
