| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that it is difficult for a wireless slave unit to receive large-capacity data from a wireless master unit, while preventing increase in power consumption, by a simple configuration without changing the OMS protocol significantly.SOLUTION: Carrier sense means repeats carrier sense operation intermittently at a first predetermined interval, first determination means makes the carrier sense means repeat the carrier sense operation at a second predetermined interval when a determination is made that a signal of a predetermined level or more is detected, and second determination means is started when a determination is made that a carrier is detected by the first determination means, and makes a transition to an operation for receiving a signal containing a preamble signal, when a determination is made that there is no carrier for a predetermined time or more. |
