| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission path testing circuit which prepares two reception data, having a phase difference in proportion to the number of bits of frame bits and switches the two reception data according to a switching signal by a reception side frame pulse and a transmission side frame pulse, so that a circuit scale can be reduced. SOLUTION: A transmission path test circuit has a loop circuit for carrying out a transmission path test in a multiplexing transmitter for multiplexing a plurality of transmission signals to transmit. The loop circuit prepares two reception data, having a phase difference in proportion to the number of bits of frame bits and switches the two reception data, according to a switching signal by a reception side frame pulse and a transmission side frame pulse, and a loop is constituted in a state with the frame bits being passed for transmission and reception as they are, even for any phase difference between transmission and reception.
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