Complex multiplexer/demultiplexer apparatus

Abstract From the Canadian patent

A complex multiplexer/demultiplexer apparatus which converts input low order group data signals to middle order group data signals and multiplexes them to high order group data signals and converts high order group data signals to middle order group data signals and demultiplexes them to low order group data signals wherein a plurality of low order group channels are processed by multiplexing and demultiplexing at a second clock bit synchronized with a first clock on the high order group side, the second clock including empty bits and the bit rate being set lower than the first clock. The empty bits may have inserted therein additional information.