Decentralizing processing type private branch exchange system

Abstract

Abstract PURPOSE:To contrive to evade the function stop of the entire system due to a fault of an equipment while making the best use of the advantages of the decentralizing processing by collecting the master clock of each node through other line and deciding the master clock for the entire system as the method synchronizing among nodes. CONSTITUTION:A trunk line synchronization display bit SCD is provided between a frame check sequence FCS and an end delimiter ED. A network clock 9 coming from a token ring 4 passes through a digital phase synchronizing circuit 13 and is fed to transmission interfaces 170, 171, 172 so long as a trunk line clock 14 is not selected by a master clock selection circuit 11 depending on the relation between a communication trunk line display circuit 8 of a token control section 6 and a clock master decision circuit 7. The communication trunk line display circuit 8 checks whether or not a trunk line clock 14 is outputted from a communication state trunk line retrieval section 12 and display '1' (at the presence of a busy trunk line) and '0' (in the absence of the busy trunk line) to a bit assigned to its own node of a trunk line synchronization display bit SCD of a circulated token frame to apply relaying.

Inventors

• 👤 Takashi Kashiwai
• 👤 柏井　隆志
• 👤 Takashi Matsumoto
• 👤 隆 松本

Bibliographic Details