| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem of complicated setting, maintenance and management with a large number of necessary attenuators at a high cost. <P>SOLUTION: In the bidirectional amplifier for a cable television including a center side i/o terminal, a downlink amplifier for amplifying downlink signal, an uplink amplifier for amplifying an uplink signals, a center side branching filter for outputting the uplink signal output from the uplink amplifier to the center side i/o terminal, and a terminal side branching filter for outputting the uplink signal input from the terminal side i/o terminal to the uplink amplifier and outputting the downlink signal output from the downlink amplifier to the same terminal side i/o terminal, attenuators each having an attenuation region, capable of attenuating both the downlink signal and the uplink signal are disposed between the center side i/o terminal and the center side branching filter or between the terminal side i/o terminal and the terminal side branching filter. <P>COPYRIGHT: (C)2004,JPO</p> |
