| 摘要 |
<p>A method is used to switch a channel which is used for a communication between a transmitting end and a receiving end from a main channel (1CH, 2CH, ..., NCH) to a protection channel (CH). The transmitting end includes N first bipolar switches (TSW1, TSW2, ..., TSWN) respectively having an input port for receiving a baseband signal input, a main port for outputting the baseband signal input to a corresponding one of N main channels and a protection port for outputting the baseband signal input to the protection channel. The receiving end includes N second bipolar switches (RSW1, RSW2, ..., RSWN) respectively having a main port for receiving the baseband signal input received from the transmitting end via a corresponding one of the N main channels, a protection port for receiving the baseband signal input received from the transmitting end via the protection channel and an output port for outputting the received baseband signal input as a baseband signal output. A loss of the received baseband signal input when the protection channel is used is dependent on an arbitrary number of second bipolar switches through which the received baseband signal input passes before the baseband signal output is obtained. The method comprises the steps of (a) recognizing at the receiving end the main channel from which the channel is switched to the protection channel, (b) generating at the receiving end control information related to an amplification of the baseband signal input received via the protection channel based on the main channel recognized in the step (a), and (c) amplifying at the receiving end the baseband signal input received via the protection channel by the amplification determined by the control information generated by the step (b). <IMAGE></p> |
