JPH01107257U

JPH01107257U -

Info

Publication number: JPH01107257U
Application number: JP109788U
Authority: JP
Priority date: 1988-01-08
Filing date: 1988-01-08
Publication date: 1989-07-19

Description

[Brief explanation of drawings]

図は本考案によるボタン電話装置のブロツク図
である。１…電話回線、２…電話機、３…内線端子、４
…フアクシミリ装置、５…局線信号検出回路、６
…主制御回路、７…信号受信回路、８…電話機回
路、９…ループ監視回路、１０…保留ループ形成
回路、１１…保留音送出回路、１２，１３…内線
給電回路、１４…内線呼出し信号発生回路、１５
，１５′…フツクスイツチ、１６…保留釦、１７
…内線釦。 The figure is a block diagram of a button telephone device according to the present invention. 1...Telephone line, 2...Telephone, 3...Extension terminal, 4
... Facsimile device, 5 ... Office line signal detection circuit, 6
... Main control circuit, 7... Signal receiving circuit, 8... Telephone circuit, 9... Loop monitoring circuit, 10... Hold loop forming circuit, 11... Hold tone sending circuit, 12, 13... Extension power supply circuit, 14... Extension calling signal generation circuit, 15
, 15'...Foot switch, 16...Hold button, 17
...Extension button.

Claims

[Scope of utility model registration request]

A communication means is provided, as well as a central office line terminal and an extension terminal, and one telephone line connected to the central office line terminal can be selectively connected to one's own telephone communication means and another telephone connected to the extension terminal. A button telephone device that can be connected to the extension terminal includes a ring signal generator that sends a ring signal between the communication lines of the extension terminal, a loop detection circuit that detects a closed circuit between the communication line terminals, and a loop detection circuit that is connected to the extension terminal. A switching circuit is provided to switch whether the telephone line is connected to the central office line terminal or to the above-mentioned calling signal generator, so that when the central office line is put on hold and the extension button is operated, the above-mentioned calling signal is switched between the telephone lines. When a closed circuit between the communication lines is detected, the communication line is connected to the office line terminal side, so that a terminal such as a facsimile machine can be connected to the extension terminal. Features a button telephone device.