JPS5637759A - Connection system for digital telephone set - Google Patents

Abstract

PURPOSE:To realize a simultaneous talking for the tranch-connected digital telephone sets, by providing the means to give the mixture and distribution to the analog signals of the branch-connected telephones and the line control means which gives a control to the catch of the digital subscriber line. CONSTITUTION:The sending speech parallel connection terminal 30 and then receiving speech parallel connection terminal 31 of the analog signal are provided to the transmitter microphone 1 and the telephone receiver 16 each. And furthermore the line control circuit 32 is provided to the line interface INT7 to give a control to the catch and release of the digital subscriber line 8. A connection is secured among the terminals 30 and 31 of the digital telephones A and B each plus the line 8, and then a connection is given between the input terminal 35 of A and the output terminal 37 of B as well as between the terminal 37 of A and the terminal 35 of B each. And a branch connection is given between the two telephones. Then the telephone which actuated the hook switch FS9 first catches the line 8 via the gate 40 and the INT7; and the telephone which actuated the switch FS9 later does not catch the line 8 until the preceding telephone has the release. Accordingly, no confusion is caused among the digital signals on the line 8 and at the same time, thus realizing a simultaneous talking for both telephones A and B.