Exchange network using four wire type bidirectional branch line

Abstract

Abstract PURPOSE:To enable the connection to the subscribers in different station without relay connection by using one transmission line, by branching the four-wire type transmissionline toward the both directions provided specific two stations and connecting the branched side to other stations other than the two stations. CONSTITUTION:When a call is taken place to the station A, which takes the B station as called party, the station A selects the vacant channel of the transmission line in both way branch, and when the signal unit A'' stops the transmission of the signal f1, the stations B and C start the exchangers B' and C'. The signal unit A'' delivers the station number of the station B. When the signal unit B'' of the station B receives the station number of itself, the delivery of impulsive pulse of the signal f2 is stopped. When the signal unit A'' of the station A detects the pulse interruption of signal f2, it delivers the called party number to connect the transmissionline, and when the called party at the station B is responded, the signal f2 is interrupted to constitute communication state. The signal unit C'' is restored, when the exchanger C' recognizes the number is not the number of C'.

Inventors

• 👤 Yoshiharu Takenaka

Bibliographic Details