| 摘要 |
A carrier sensor senses the input/output level of a radio processing unit. When the input/output level sensed by the carrier sensor is more than a specified level, a transmission-reception controller stops internal radio communication by stopping the operation of transmission/reception units. When the input/output level sensed by the carrier sensor is less than a specified level, the transmission-reception controller allows internal radio communication by operating the transmission/reception units.
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