JPS6236432B2 - - Google Patents
Info
- Publication number
- JPS6236432B2 JPS6236432B2 JP57214392A JP21439282A JPS6236432B2 JP S6236432 B2 JPS6236432 B2 JP S6236432B2 JP 57214392 A JP57214392 A JP 57214392A JP 21439282 A JP21439282 A JP 21439282A JP S6236432 B2 JPS6236432 B2 JP S6236432B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- circuit
- power supply
- subscriber
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/001—Current supply source at the exchanger providing current to substations
- H04M19/005—Feeding arrangements without the use of line transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Description
発明の属する分野の説明
本発明は、加入者端末の動作状態によらず、加
入者インタフエース回路を能動状態にすることが
可能な電流供給監視方式に関するものである。
従来技術
従来の給電回路と監視回路は、第１図のように
構成されている。第１図の１は加入者端末、２は
加入者線、３−ａは給電回路１０の電池側端子、
３−ｂは給電回路１０の地気側端子、１１は端子
３−ａ，３−ｂから電圧を引きこんで特定の給電
特性をうる制御回路１４−ａ，１４−ｂに伝達す
る抵抗回路、１２−ａ，１２−ｂは給電用トラン
ジスタ、１３−ａ，１３−ｂは演算増幅器、２０
は給電回路からの情報に基づき、加入者端末１の
動作状態を判別する監視回路、２１は監視回路に
よる判別結果を出力する端子、３０は２線４線変
換回路、３１は平衡回路網、３２は４線送り信号
端子（4WS）、３３は４線受け信号端子（4WR）
である。
加入者端末１が直流的にオフ（非動作状態）の
とき、３−ａ端子はほぼ電池電圧、３−ｂ端子は
ほぼ地気電圧となり、給電トランジスタ１２−
ａ，１２−ｂはそれぞれオフ状態となつている。
このため、加入者端末１が非動作状態で加入者線
２に直流電流が流れていないとき、交換機側から
呼出信号を使用せずに端末を起動する無鳴動呼出
方式において、端子4WRからの交流信号が給電
回路１０を通過できないため、特別のバイパス回
路を付加するなどの対策が必要であつた。また、
バイパス回路は、端末が動作状態になつたとき、
監視回路の直流判別閾値および交流信号のレベル
変動に影響しないよう設計する必要があつた。
発明の目的
本発明の目的は、このような従来の欠点を改善
するため、加入者線の直流電流の有無によらず、
電子化給電回路を能動状態にでき、また無鳴動呼
出機能を電子回路で簡単に構成できる電流供給監
視方式を提供することにある。
発明の概要
本発明の電流供給監視方式は、加入者線を通し
て端末に直流電流を供給する２端子の定電圧給電
回路と、上記直流電流の大きさにより端末の動作
状態を判別する監視回路とを有する加入者インタ
フエース部において、上記定電圧給電回路の２端
子間に高抵抗を通して接続する方向性を持たない
スイツチを設け、該スイツチを導通させることに
より上記定電圧給電回路を能動状態とし、また、
上記スイツチの導通情報により上記監視回路の閾
値を切換えて、端末の動作状態を正常に監視する
ことに特徴がある。以下、図面について詳細に説
明する。
発明の実施例
第２図は、本発明の実施例を示す加入者インタ
フエース部のブロツク図である。１は加入者端
末、２は加入者線、３−ａは給電回路１０の電池
側端子、３−ｂは給電回路１０の地気側端子、１
１は３−ａ，３−ｂから電圧を引きこんで特性の
給電特性をうる制御回路、１４−ａ，１４−ｂに
伝達する抵抗回路、１２−ａ，１２−ｂは給電用
トランジスタ、１３−ａ，１３−ｂは演算増幅
器、２０は給電回路からの情報にもとづき加入者
端末１の動作状態を判別する監視回路、２１は監
視回路による判別結果を出力する端子、２２は加
入者線の直流電流の大小を判別する閾値を切替え
る制御端子、３０は２線４線変換回路、３１は平
衡回路網、３２は４線送り信号端子、３３は４線
受け信号端子、４０は給電回路１０の２端子を抵
抗４２を通して接続するスイツチ回路、４１はス
イツチ回路４０をオン・オフする制御端子であ
る。
加入者端末１に直流電流を供給する定電圧給電
回路１０は片線毎に内部抵抗γを有しており、加
入者端末１が動作状態のとき、端末の直流抵抗を
ＲT、加入者線２の直流抵抗をＲLとすると給電電
流Ｉは、Ｉ＝ＶＢＢ／２γ＋ＲＬ＋ＲＴとなる。ただし
ＶBBは
給電回路の電源電圧である。このとき、給電用ト
ランジスタ１２−ａ，１２−ｂのエミツタ、コレ
クタ間の電圧はγ・Ｉとなり、給電用トランジス
タ１２−ａ，１２−ｂは能動状態となる。従つて
４線受け信号端子３３に入力した交流信号は、２
線４線変換回路３０、給電特性の制御回路１４−
ａ，１４−ｂ、演算増幅器１３−ａ，１３−ｂ、
給電用トランジスタ１２−ａ，１２−ｂを通つて
加入者線２に出力され、加入者端末１に送られ
る。また、加入者端末１からの交流信号は、加入
者線２を経て給電回路１０に入力し、抵抗回路１
１、制御回路１４−ａ，１４−ｂ、２線４線交換
回路３０を通つて４線送り信号端子３２に出力さ
れる。このとき監視回路２０は、制御回路１４−
ａ，１４−ｂから得た加入者線２の電流値情報に
より加入者端末１の動作状態を識別し、端子２１
より論理情報として“１”を出力する。
非動作状態の加入者端末１を高電圧の呼出信号
を用いず、４線受け信号端子３３に入力した特定
の交流信号により起動する場合、まず処理装置か
らの命令により制御端子４１を通してスイツチ回
路４０を起動する。抵抗４２の値Ｒは給電用トラ
ンジスタ１２−ａ，１２−ｂが能動状態となる抵
抗値で抵抗４２が加入者線２に並列に挿入された
ことによる交流信号の損失が小さくなるよう高抵
抗が選ばれている。次に、加入者端末１を起動す
るための特定の交流信号を、４線受け信号端子３
３から２線４線変換回路３０、制御回路１４−
ａ，１４−ｂ、演算増幅器１３−ａ，１３−ｂ、
給電用トランジスタ１２−ａ，１２−ｂを通して
加入者線２に送出する。こうして、加入者端末１
に起動がかけられる。また、監視回路２０は、ス
イツチ回路４０の起動情報により制御端子２２を
通して閾値を切替える。これはスイツチ回路４
０、抵抗４２が加入者線２に並列に挿入され、加
入者端末１が動作状態になつたとき、給電回路１
０に流れる電流
DESCRIPTION OF THE FIELD OF THE INVENTION The present invention relates to a current supply monitoring system capable of activating a subscriber interface circuit regardless of the operating state of a subscriber terminal. Prior Art A conventional power supply circuit and monitoring circuit are configured as shown in FIG. In FIG. 1, 1 is a subscriber terminal, 2 is a subscriber line, 3-a is a battery side terminal of the power supply circuit 10,
3-b is an earth side terminal of the power supply circuit 10; 11 is a resistance circuit that draws voltage from terminals 3-a and 3-b and transmits it to control circuits 14-a and 14-b to obtain specific power supply characteristics; 12-a, 12-b are power supply transistors, 13-a, 13-b are operational amplifiers, 20
2 is a monitoring circuit that determines the operating state of the subscriber terminal 1 based on information from the power supply circuit; 21 is a terminal that outputs the determination result by the monitoring circuit; 30 is a 2-wire/4-wire conversion circuit; 31 is a balanced circuit network; is a 4-wire sending signal terminal (4WS), 33 is a 4-wire receiving signal terminal (4WR)
It is. When the subscriber terminal 1 is DC-off (non-operating state), the terminal 3-a is almost at the battery voltage, the terminal 3-b is almost at the earth voltage, and the power supply transistor 12-
a and 12-b are each in an off state.
For this reason, when the subscriber terminal 1 is in an inactive state and no DC current is flowing through the subscriber line 2, in the silent ringing method that starts the terminal without using a ringing signal from the exchange side, the AC from terminal 4WR is Since the signal cannot pass through the power supply circuit 10, countermeasures such as adding a special bypass circuit were required. Also,
The bypass circuit operates when the terminal becomes operational.
It was necessary to design the monitoring circuit so that it would not affect the DC discrimination threshold and the level fluctuations of the AC signal. OBJECT OF THE INVENTION An object of the present invention is to improve such conventional drawbacks, regardless of the presence or absence of direct current in the subscriber line.
It is an object of the present invention to provide a current supply monitoring system capable of activating an electronic power supply circuit and easily configuring a silent call function using an electronic circuit. Summary of the Invention The current supply monitoring system of the present invention includes a two-terminal constant voltage power supply circuit that supplies DC current to a terminal through a subscriber line, and a monitoring circuit that determines the operating state of the terminal based on the magnitude of the DC current. In the subscriber interface section having a switch, a non-directional switch is provided which is connected between two terminals of the constant voltage power supply circuit through a high resistance, and by making the switch conductive, the constant voltage power supply circuit is activated. ,
A feature of the present invention is that the operating state of the terminal is normally monitored by switching the threshold value of the monitoring circuit based on the continuity information of the switch. The drawings will be described in detail below. Embodiment of the Invention FIG. 2 is a block diagram of a subscriber interface section showing an embodiment of the invention. 1 is a subscriber terminal, 2 is a subscriber line, 3-a is a battery side terminal of the power supply circuit 10, 3-b is an earth side terminal of the power supply circuit 10, 1
1 is a control circuit that draws voltage from 3-a and 3-b to obtain a characteristic power supply characteristic; a resistor circuit that transmits the voltage to 14-a and 14-b; 12-a and 12-b are power supply transistors; -a and 13-b are operational amplifiers, 20 is a monitoring circuit that determines the operating state of the subscriber terminal 1 based on information from the power supply circuit, 21 is a terminal that outputs the determination result by the monitoring circuit, and 22 is a subscriber line terminal. 30 is a 2-wire/4-wire conversion circuit; 31 is a balanced circuit network; 32 is a 4-wire sending signal terminal; 33 is a 4-wire receiving signal terminal; 40 is a power supply circuit 10; A switch circuit connects two terminals through a resistor 42, and 41 is a control terminal that turns the switch circuit 40 on and off. The constant voltage power supply circuit 10 that supplies DC current to the subscriber terminal 1 has an internal resistance γ for each wire, and when the subscriber terminal 1 is in operation, the DC resistance of the terminal is R T and the subscriber line If the DC resistance of 2 is R L , the power supply current I is I=V BB /2γ+R L +R T. However, V BB is the power supply voltage of the power supply circuit. At this time, the voltage between the emitters and collectors of the power supply transistors 12-a, 12-b becomes γ·I, and the power supply transistors 12-a, 12-b become active. Therefore, the AC signal input to the 4-wire receiving signal terminal 33 is
Line 4-wire conversion circuit 30, power supply characteristic control circuit 14-
a, 14-b, operational amplifiers 13-a, 13-b,
The signal is outputted to the subscriber line 2 through the power feeding transistors 12-a and 12-b, and then sent to the subscriber terminal 1. Further, an AC signal from the subscriber terminal 1 is input to the power supply circuit 10 via the subscriber line 2, and the resistance circuit 1
1. The signal is output to the 4-wire sending signal terminal 32 through the control circuits 14-a, 14-b and the 2-wire/4-wire switching circuit 30. At this time, the monitoring circuit 20 controls the control circuit 14-
The operating state of the subscriber terminal 1 is identified based on the current value information of the subscriber line 2 obtained from terminals a and 14-b, and the terminal 21
"1" is output as logical information. When the inactive subscriber terminal 1 is activated by a specific AC signal input to the 4-wire receiving signal terminal 33 without using a high-voltage calling signal, first the switch circuit 40 is activated through the control terminal 41 by a command from the processing device. Start. The value R of the resistor 42 is a resistance value at which the power supply transistors 12-a and 12-b become active, and the resistor 42 has a high resistance so as to reduce the loss of AC signals caused by being inserted in parallel with the subscriber line 2. selected. Next, a specific AC signal for activating the subscriber terminal 1 is transmitted to the 4-wire receiving signal terminal 3.
3 to 2-wire 4-wire conversion circuit 30, control circuit 14-
a, 14-b, operational amplifiers 13-a, 13-b,
The signal is sent to the subscriber line 2 through the power supply transistors 12-a and 12-b. In this way, subscriber terminal 1
is activated. Furthermore, the monitoring circuit 20 switches the threshold value through the control terminal 22 based on activation information of the switch circuit 40. This is switch circuit 4
0, the resistor 42 is inserted in parallel to the subscriber line 2, and when the subscriber terminal 1 is in operation, the power supply circuit 1
Current flowing to 0
【式】がスイツ
チ回路４０、抵抗４２が挿入されていないときに
流れる電流ＶＢＢ／２γ＋ＲＴ＋ＲＬと異なるためであ
る。加
入者端末が応答し、動作状態に移行すると、給電
回路１０に流れる電流がＶＢＢ／２γ＋ＲからThis is because [Formula] is different from the current V BB /2γ+R T +R L that flows when the switch circuit 40 and the resistor 42 are not inserted. When the subscriber terminal responds and enters the operating state, the current flowing through the power supply circuit 10 increases from V BB /2γ+R.
【式】に変化し、監視回路２０
によつて判別され、端子２１より論理情報として
“１”が出力される。
１〜２ｍＡ程度の微小直流電流でトーキ信号を
発生する誘導式分配器に対しても、上記のスイツ
チ回路付の電子化給電回路１０に接続すれば、正
常に動作させることができる。
なお、スイツチ回路４０はトランジスタスイツ
チ等により簡単に実現できるため、これらの回路
全体を電子化することができる。
発明の効果
以上説明したように、本発明によれば、簡単な
スイツチ回路の付加により、加入者線の直流電流
の有無によらず、電子化給電回路を能動状態にで
き、また監視回路の閾値を切替えることによりス
イツチ回路が導通状態でも端末の動作・非動作を
正確に判別できるため、無鳴動呼出機能を電子回
路で容易に構成できるという利点がある。It is determined by the monitoring circuit 20, and "1" is output from the terminal 21 as logic information. Even an inductive distributor that generates a talkie signal with a minute DC current of about 1 to 2 mA can be operated normally if it is connected to the electronic power supply circuit 10 with a switch circuit. Incidentally, since the switch circuit 40 can be easily realized using a transistor switch or the like, the entire circuit can be electronically implemented. Effects of the Invention As explained above, according to the present invention, by adding a simple switch circuit, the electronic power supply circuit can be activated regardless of the presence or absence of direct current in the subscriber line, and the threshold value of the monitoring circuit can be By switching the switch circuit, it is possible to accurately determine whether the terminal is in operation or not even when the switch circuit is in a conductive state, so there is an advantage that the silent call function can be easily configured using an electronic circuit.
第１図は従来の給電回路と監視回路からなる加
入者インタフエース部のブロツク構成図、第２図
は本発明の一実施例を示す加入者インタフエース
部のブロツク構成図である。
１：加入者端末、２：加入者線、３−ａ：電池
側端子、３−ｂ：地気側端子、１０：給電回路、
１１：抵抗回路、１２−ａ，１２−ｂ：給電用ト
ランジスタ、１３−ａ，１３−ｂ：演算増幅器、
１４−ａ，１４−ｂ：給電制御回路、２０：監視
回路、２１：監視出力端子、２２：閾値切替制御
端子、３０：２線４線変換回路、３１：平衡回路
網、３２：４線送り信号端子、３３：４線受け信
号端子、４０：スイツチ回路、４１：スイツチ制
御端子、４２：抵抗。
FIG. 1 is a block diagram of a subscriber interface section comprising a conventional power feeding circuit and a monitoring circuit, and FIG. 2 is a block diagram of a subscriber interface section showing an embodiment of the present invention. 1: subscriber terminal, 2: subscriber line, 3-a: battery side terminal, 3-b: earth side terminal, 10: power supply circuit,
11: Resistance circuit, 12-a, 12-b: Power supply transistor, 13-a, 13-b: Operational amplifier,
14-a, 14-b: Power supply control circuit, 20: Monitoring circuit, 21: Monitoring output terminal, 22: Threshold switching control terminal, 30: 2-wire 4-wire conversion circuit, 31: Balanced circuit network, 32: 4-wire feed Signal terminal, 33: 4-wire receiving signal terminal, 40: Switch circuit, 41: Switch control terminal, 42: Resistor.
Claims (1)
２端子の定電圧給電回路と、上記直流電流の大き
さにより端末の動作状態を判別する監視回路とを
有する加入者インタフエース部において、上記定
電圧給電回路の２端子間に高抵抗を通して接続す
る方向性を持たないスイツチを設け、該スイツチ
を導通させることにより上記定電圧給電回路を能
動状態とし、また、上記スイツチの導通情報によ
り上記監視回路の閾値を切換えて、端末の動作状
態を正常に監視することを特徴とする電流供給監
視方式。1. In a subscriber interface section that has a two-terminal constant voltage power supply circuit that supplies direct current to the terminal through the subscriber line and a monitoring circuit that determines the operating state of the terminal based on the magnitude of the direct current, A non-directional switch connected through a high resistance between two terminals of the power supply circuit is provided, and by making the switch conductive, the constant voltage power supply circuit is activated, and the continuity information of the switch is used to control the monitoring circuit. A current supply monitoring method characterized by switching threshold values to properly monitor the operating status of a terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57214392A JPS59104892A (en) | 1982-12-07 | 1982-12-07 | Current supply supervisory system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57214392A JPS59104892A (en) | 1982-12-07 | 1982-12-07 | Current supply supervisory system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59104892A JPS59104892A (en) | 1984-06-16 |
| JPS6236432B2 true JPS6236432B2 (en) | 1987-08-06 |
Family
ID=16655024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57214392A Granted JPS59104892A (en) | 1982-12-07 | 1982-12-07 | Current supply supervisory system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59104892A (en) |
-
1982
- 1982-12-07 JP JP57214392A patent/JPS59104892A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59104892A (en) | 1984-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS59501239A (en) | Telephone line power supply control device in the telephone | |
| US4376876A (en) | DC Supply for an electronic signalling device | |
| US4380687A (en) | Power supply control circuit for subscriber carrier telephone system | |
| JPS6196862A (en) | Precircuit equipment for subscribers | |
| JPS58187061A (en) | Channel collecting device for telephone set off-hookless for telephone set with microprocessor | |
| US4539438A (en) | Active impedance transformer assisted line feed circuit with supervision filtering | |
| JPS6236432B2 (en) | ||
| US3906162A (en) | Loop extender with bypass capacitor discharge | |
| JPS6351319B2 (en) | ||
| WO1988008234A1 (en) | Telephone subset circuit arrangement | |
| US4223186A (en) | Circuit arrangement for line-supplied subscriber stations having dial devices | |
| US4609782A (en) | Solid state signal insertion circuit and method for use in a telephony system or the like | |
| US5317634A (en) | Telephone subset arrangement | |
| CA1196433A (en) | Active impedance transformer assisted line feed circuit with supervision filtering | |
| JPH0318382B2 (en) | ||
| US4122312A (en) | Loop extender | |
| JP2865181B2 (en) | Communication line remote disconnection device | |
| JPS60144062A (en) | Single line earth detection method | |
| JP2506104B2 (en) | Telephone handset switching system | |
| US5400398A (en) | Electronic telephone set with low power hook switch | |
| JP3525480B2 (en) | Sidetone reduction circuit | |
| JPH01264038A (en) | signal transmission device | |
| JPH02250537A (en) | S interface circuit of ISDN terminal equipment | |
| JPS63234653A (en) | Polarity inversion detecting circuit | |
| JPS6313564A (en) | Circuit device separating core of subscriber connection lines from feeder circuit |