Method and system for making bipolar switching to protection channel
AssigneeFujitsu Limited
InventorsHiroyuki Wachi, Yoshihiro Ito
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Abstract
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 to a protection channel. The method of the present invention allows automatic compensation for the loss caused by the switching of the channel to the protection channel. Furthermore, the level difference of the baseband signal outputs from each of the main channels can be automatically controlled to zero regardless of the main channel from which the channel is switched to the protection channel.
Claims13
A method of switching a channel which is used for communication between a transmitting end and a receiving end from a main channel to a protection channel, said transmitting end including N first bipolar switches 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, said protection ports of the N first bipolar switches being connected in series to the protection channel, said input port of the first bipolar switch being normally connected to the main port and connected to the protection port when switching to the protection channel, said receiving end including N second bipolar switches 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, said protection ports of the N second bipolar switchers being connected in series to the protection channel, wherein 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, said output port of the second bipolar switch being normally connected to the main port and connected to the protection port when switching to the protection channel, said method comprising 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 said 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 said step (b).
A system for switching a channel which is used for communication between a transmitting end and a receiving end from a main channel to a protection channel, said transmitting end including N first bipolar switches 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, said protection ports of the N first bipolar switches being connected in series to the protection channel, said input port of the first bipolar switch being normally connected to the main port and connected to the protection port when switching to the protection channel, said receiving end including N second bipolar switches 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, said protection ports of the N second bipolar switches being connected in series to the protection channel, wherein a loss of the received baseband signal input w n 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, said output port of the second bipolar switch being normally connected to the main port and connected to the protection port when switching to the protection channel, said system comprising:
- switched channel recognizing means for recognizing at the receiving end the main channel from which the channel is switched to the protection channel;
- amplification control means for 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 said switched channel recognizing means;
- and
- amplifying means for amplifying at the receiving end the baseband signal input received via the protection channel by the amplification determined by the control information generated by said amplification control means.
Dependencies are inferred from the claim text.