| 摘要 |
A multiplexing device with small circuitry, which reduces a time period during which a signal format mismatch state is continued within a communications system due to a difference of the time point at which switching to a relay exchange mode is performed, and which can oppose a multiplexing device of a conventional type via an exchange, by comprising a unit for inserting a first periodic signal including one or more predetermined bit patterns in a voice signal and outputting the signal to the exchange, when a path from the multiplexing device on the opposing side is not connected; a unit for inserting a second periodic signal including a larger number of predetermined bit patterns from the time point at which the first periodic signal is detected within the signal input after the above described path is connected; and a unit for switching the multiplexing device itself to the relay exchange mode when the second periodic signal is detected within the signal input from the exchange.
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