Patent ID: 8625629

Claim:
A transmitting and receiving system that is provided in a duplexed system comprising an operation system unit and a standby system unit, wherein when a malfunction occurs in the operation system unit, the standby system unit operates in place of the operation system unit, and the transmitting and receiving system comprises: a multiplexer included in the operation system unit; a demultiplexer included in the operation system unit; a multiplexer included in the standby system unit; a demultiplexer included in the standby system unit; a circuit configured to: perform a parallel/serial conversion on a data signal and a control signal, which have been received by the standby system unit from an equipment connected to the standby system unit, using the multiplexer of the standby system unit to multiplex the signals into a first serial signal; transmit the first serial signal from the standby system unit to the operation system unit; and perform a serial/parallel conversion on the first serial signal using the demultiplexer of the operation system unit to demultiplex the first serial signal and supply the demultiplexed signals to a receiving device in the operation system unit, and a circuit configured to: perform a parallel/serial conversion on a data signal and a control signal, which have been prepared by the operation system unit for transmitting the signals through the standby system unit to the equipment connected to the standby system unit, using the multiplexer of the operation system unit to multiplex the signals into a second serial signal; transmit, from the operation system unit to the standby system unit, the second serial signal; and perform a serial/parallel conversion on the second serial signal using the demultiplexer of the standby system unit to demultiplex the second serial signal and supply the demultiplexed signals to a transmitting device in the standby system unit.