JPS6433253U

JPS6433253U -

Info

Publication number: JPS6433253U
Application number: JP12640287U
Authority: JP
Priority date: 1987-08-21
Filing date: 1987-08-21
Publication date: 1989-03-01

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示すブロツク図
、第２図はマイクロプロセツサのゼネラルフロー
を示すフローチヤート、第３図はオンフツク処理
を表わすフローチヤート、第４図はＰＢ信号受信
処理を表わすフローチヤートである。１……電話交換機、２……ＰＢ外線、４……通
話線、５_１〜５_ｎ……電話機、６……保留音源回
路、７……着信検出回路、９……ループ検出回路
、１０……フオトサイリスタ、１１……呼出信号
音回路、１２……リードリレー、１３……内線呼
出音回路、１４……ＰＢレシーバ回路、１６……
機能設定回路、１７……マイクロプロセツサ、２
０……ドアホン、２１……ドアホン通話回路。 Fig. 1 is a block diagram showing an embodiment of this invention, Fig. 2 is a flow chart showing the general flow of the microprocessor, Fig. 3 is a flow chart showing on-hook processing, and Fig. 4 is a flow chart showing PB signal reception processing. This is a flowchart showing the process. DESCRIPTION OF SYMBOLS 1... Telephone exchange, 2... PB outside line, 4... Call line, 5 ₁ to 5 _n ... Telephone, 6... Hold sound source circuit, 7... Incoming call detection circuit, 9... Loop detection circuit, 10... ...Photothyristor, 11... Ringing signal tone circuit, 12... Reed relay, 13... Extension ringing circuit, 14... PB receiver circuit, 16...
Function setting circuit, 17...Microprocessor, 2
0... Door phone, 21... Door phone call circuit.

Claims

[Scope of utility model registration request]

A standard telephone in an idle state in a telephone exchange that controls exchange connections between a PB external line or other extension telephones based on PB dial information from a PB dial standard telephone connected via a pair of telephone lines. Signal sending means for selectively sending a voice guidance signal or a tone signal representing an extension to the telephone line based on off-hook of the telephone;
A setting means for setting the output of the signal sending means to either the voice guidance mode or the tone mode, and when in the voice guidance mode, prohibiting the PB signal reception operation at least while the voice guidance signal is being sent based on the output of the setting means; , and control means for immediately allowing PB signal reception operation from off-hook when in tone mode.