| 摘要 |
PROBLEM TO BE SOLVED: To realize fine communication between an outdoor unit(ODU) 7 and an indoor unit(IDU) 8 through a communication cable 9 by automatically adjusting the transmission amplification gain of each unit without performing complicated operation in a base station device 1 and a subscriber's station device 2 having a format of connecting the ODU 7 to the IDU 8 through the communication cable 9. SOLUTION: The IDU 8 amplifies a test signal by a transmission amplifier 27 and transmits the amplified signal through the communication cable 9. In the ODU 7, a decision part 18 compares the receiving sensitivity of the test signal detected by a detection part 16 with reference receiving sensitivity stored in a storage part 17 and informs the IDU 8 of the decided result. The IDU 8 changes the gain of the amplifier 27, repeats the transmission of the test signal until the decided result becomes acknowledgeable, and when a positive judged result is obtained, sets up the gain to the gain of the amplifier 27, informs the ODU 7 of the set gain and sets up the gain of the amplifier 27 in the gain of a transmission amplifier 20 of the ODU 7. |
