SIGNAL SYNCHRONIZING SYSTEM

摘要

PURPOSE:To attain the transmission of a synchronizing data frame synchronously with a main synchronizing signal by using an idle data frame in a master station for signal synchronization and varying the length of an idle data frame in response to the time when the master station receives a token. CONSTITUTION:A station 11 being the master station for synchronization sends an idle data frame DS prior to the transmission of a synchronizing data frame D1 sent by its own station. The idle data frame DS consists of a fixed length part DSA and a variable length part DSB. The length of the variable length part SSB is adjusted in response to the time when the master station 11 receives a token. In order to adjust the variable length part, a means recognizing the transmission start time is provided to the master station 11. The length of the variable length part DSB is adjusted based on a time difference between a main synchronizing signal S1 and the transmission start time of the fixed length part DSA detected by the said transmission start time detection means. The signal synchronization with respect to the master station is applied at slave stations 12-1n by detecting the received time of the said synchronizing data frame D1.