JPH01172756U

JPH01172756U -

Info

Publication number: JPH01172756U
Application number: JP6300488U
Authority: JP
Priority date: 1988-05-13
Filing date: 1988-05-13
Publication date: 1989-12-07

Description

[Brief explanation of the drawing]

第１図は本考案による加入者回路のブロツク図
、第２図は従来の加入者回路の一例を示すブロツ
ク図、第３図は他の従来例を示すブロツク図であ
る。１，２，２１，２２……接続端子、３……呼出
信号発生器、４，５，２５，２６……電流供給回
路、６……電源回路、７，２７……２線４線変換
回路、８……リレーの接点、９，３１……単独電
話機、２３……負電源回路、２４……正電源回路
、１１，２８……スイツチ制御回路、２８ａ，２
８ｂ，２８ｃ，２８ｄ，２８ｅ……スイツチ、２
９，３０……ダイオード。 FIG. 1 is a block diagram of a subscriber circuit according to the present invention, FIG. 2 is a block diagram showing an example of a conventional subscriber circuit, and FIG. 3 is a block diagram showing another conventional example. 1, 2, 21, 22... Connection terminal, 3... Calling signal generator, 4, 5, 25, 26... Current supply circuit, 6... Power supply circuit, 7, 27... 2-wire 4-wire conversion circuit , 8... Relay contact, 9, 31... Individual telephone, 23... Negative power supply circuit, 24... Positive power supply circuit, 11, 28... Switch control circuit, 28a, 2
8b, 28c, 28d, 28e...Switch, 2
9,30...Diode.

Claims

[Scope of utility model registration request]

In a subscriber circuit such as a private branch exchange that is equipped with a current supply circuit that supplies a talking current and a ringing signal generation circuit that sends out a ringing signal, the ringing signal generation circuit is
Consisting of a power supply circuit connected in series to a power supply circuit for supplying communication current, and a switch circuit so that the voltage in series is applied between communication lines with alternating polarity. A subscriber circuit featuring: