| 摘要 |
A demand assign multiplexer has a multiplexing portion multiplexing a signal which can be transmitted in a statistical multiplexing. Also, the multiplexer has an output element for outputting a channel assignment demand depending upon a signal from a system which requires guarantee of transparent data transfer which guarantees content of transfer in a normal state of a transmission path. A control portion controls to perform demand assign process with channel assignment depending upon the output of the statistical multiplexing processing portion; and the signals which require guaranteed transparent data transfers.
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