SYNCHRONOUS MULTIPLEX TRANSMISSION APPARATUS

摘要

A reception processing unit (21) which receives digital data with data frame consisting of pairs of supervisory data fields and information data filed and further including the data frames negative stuffs or positive stuffs in accordance with need and discovers the head position of the information data filed, wherein an enable signal is produced only at the timing where the information data filed should appear in the successive data frames received; a count operation of a counter (32) is performed only in the term when the enable signal is being generated; and the head position is detected each time the counter finishes counting a number of bytes equal to the fixed length of the information data.