| 摘要 |
A time division exchange interchanges predetermined time slots of a time division multiplexed signal and returns it to a network during a loop-back test. A buffer memory in a time division multiplexed trunk is used to interchange the predetermined time slots. Alternatively, the buffer memory is provided in a return loop for use during the loop-back test. Therefore, it can be determined that the received signal is sent from another exchange and the loop-back test can be performed using ordinary exchanging processing procedures.
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