Transparent transport overhead mapping

By mapping operation, the byte by whom the transport overhead of the data stream was identified is mapped by other unused areas of an overhead. The byte mapped by mapping operation is mapped and returned to the location to which a byte was moved from there by デマッピングオペ ration. Passage operation is used a connection data stream with much single terminal offices, or in order to process the changes of a data stream by which a multiplexer is carried out from there.