DE3001132A1 - Telephone instrument for impulse type number selection - with switched low impedance path to facilitate subscriber identification by exchange - Google Patents

Telephone instrument for impulse type number selection - with switched low impedance path to facilitate subscriber identification by exchange

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Publication number
DE3001132A1
DE3001132A1 DE19803001132 DE3001132A DE3001132A1 DE 3001132 A1 DE3001132 A1 DE 3001132A1 DE 19803001132 DE19803001132 DE 19803001132 DE 3001132 A DE3001132 A DE 3001132A DE 3001132 A1 DE3001132 A1 DE 3001132A1
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Germany
Prior art keywords
fet2
exchange
circuit
fet1
instrument
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.)
Granted
Application number
DE19803001132
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German (de)
Other versions
DE3001132C2 (en
Inventor
Helmut Dipl.-Ing. 8000 München Losehand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19803001132 priority Critical patent/DE3001132A1/en
Publication of DE3001132A1 publication Critical patent/DE3001132A1/en
Application granted granted Critical
Publication of DE3001132C2 publication Critical patent/DE3001132C2/de
Granted legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

The circuit is intended to simplify the recognition of the subscriber when the hand set is lifted. A circuit comprising a resistor (R1) and two field effect transistors (FET1, FET2) is connected across the lines inside the instrument. The FET gates are connected to a control unit (AS). The FETs are of the depletion type and are in the conducting state when no gate voltage is applied. When the hand set is lifted the contact (gu) on the cradle connects the instrument to the exchange. The low recognition voltage is applied to a low impedance path (R1). When identified, the exchange switches on the operating voltage whereupon the impulse generator in the selector system (TWB) becomes active. Impulses are transmitted to the control unit (AS), rectified and applied to the FET gate circuits. The FETs become non- conducting and the path reverts to a high impedance state. Normal operation can then proceed. The FET controlled circuit bypasses the bridge rectifier (GB) in the instrument which has a high impedance tothe recognition voltage, and would not pass sufficient current to operate the exchange equipment without complicated extra circuitry.

Description

Schaltungsanordnung für über Anschlußleitungen ge-Circuit arrangement for via connecting lines

speiste Teilnehmerstationen mit Wähleinrichtungen für das Impuls-Wahl-Verfahren in Fernmelde-, insbesondere Fernsprechanlagen.fed subscriber stations with dialing devices for the pulse dialing process in telecommunications, in particular telephone systems.

Die Erfindung betrifft eine Schaltungsanordnung für über Anschlußleitungen gespeiste Teilnehmerstationen mit Wähleinrichtungen für das Impuls-Wahl-Verfahren in Fernmelde-, insbesondere Fernsprechanlagen, bei denen die Speisung über eine Gleichrichterbrücke erfolgt und die Umschaltung der Anschlußleitung von der Hör- und Sprechschaltung auf die Wähleinrichtung mittels eines bistabilen Umschalterelais erfolgt.The invention relates to a circuit arrangement for connecting lines powered subscriber stations with dialing devices for the pulse dialing process in telecommunications, in particular telephone systems, where the supply is via a Rectifier bridge takes place and the switching of the connection line from the hearing and speech switching to the selection device by means of a bistable switch relay he follows.

Leitungsgespeiste Teilnehmerstationen werden, damit sie polungsunabhängig sind über eine Gleichrichterbrücke gespeist. Damit derartige Teilnehmerstationen auch bei Anschluß an Vorfeldeinrichtungen, z.B. an einem Wählsternschalter, einwandfrei arbeiten, darf der Gleichstromwiderstand bei niedrigen Strömen während des Anreizzustandes gewisse Höchstwerte nicht überschreiten. Die Dioden der benötigten Gleichrichterbrücke sind aber bei kleinen Strömen sehr hochohmig.Line-fed subscriber stations are thus polarity-independent are fed via a rectifier bridge. So that such subscriber stations Even when connected to apron equipment, e.g. to a selector star switch, it is flawless work, the DC resistance is allowed to work at low currents during the stimulus state do not exceed certain maximum values. The diodes of the required rectifier bridge but are very high resistance with small currents.

Daher mußten bisher Relais und konventionelle Sprechschaltungen zur Identifikation benutzt werden, die noch bei Strömen bis hinab zu 0,12 mA ein Widerstand von 3,2 k0hm aufweisen.Therefore relays and conventional speech circuits had to be used up to now Identification can be used that still has a resistance at currents down to 0.12 mA of 3.2 kΩ.

Bei Teilnehmerstationen die nach dem Impuls-Wahl-Verfahren arbeiten, waren relativ aufwendige Rücksetzschaltungen notwendig, die ein bistabiles Umschalterelais in eine definierte Ruhelage zum Zwecke einer sicheren Identifikation setzten.For subscriber stations that work according to the pulse-dialing method, relatively complex reset circuits were necessary, which a bistable changeover relay put in a defined rest position for the purpose of reliable identification.

Aufgabe der Erfindung ist es eine Schaltungsanordnung der eingangs genannten Art anzugeben, die eine sichere Identifizierung mit geringen Strömen ohne aufwendige Rücksetzschaltungen ermöglicht.The object of the invention is a circuit arrangement of the above Specify the type mentioned, which allows reliable identification with low currents without allows complex reset circuits.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß parallel zum Eingang der Gleichrichterbrücke ein Strompfad angeordnet ist, der über eine Ansteuerschaltung bei angeschaltetem Identifizierungsstrom niederohmig und bei angeschaltetem Speisestrom hochohmig geschaltet wird.This object is achieved in that parallel to A current path is arranged at the input of the rectifier bridge, which via a control circuit low-resistance when the identification current is switched on and when the supply current is switched on is switched to high resistance.

Der Vorteil der Erfindung liegt darin, daß ohne aufwendige Rücksetzschaltungen eine sichere Identifizierung der Teilnehmerstation auch bei Anschluß an Vorfeldeinrichtungen gewährleistet ist, da die Identifizierung über den bei Fließen eines Identifizierungsstromes niederohmigen Strompfad erfolgt.The advantage of the invention is that without complex reset circuits reliable identification of the subscriber station even when connected to apron equipment is guaranteed, since the identification via the flow of an identification current low-resistance current path takes place.

Eine zweckmäßige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Strompfad aus einer Reihenschaltung eines Widerstandes und zweier selbstleitender Feldeffekttransistoren des Verarmungstyps besteht, wobei die zwei Feldeffekttransistoren derart in Reihe geschaltet sind, daß die beiden Source-Anschlüsse miteinander verbunden sind. Hierdurch ergibt sich ein einfacher, billiger und zuverlässiger Aufbau für den erfindungsgemäßen Strompfad.An expedient embodiment of the invention is characterized in that that the current path consists of a series connection of a resistor and two normally-on Field effect transistors of the depletion type consists, the two field effect transistors are connected in series in such a way that the two source connections are connected to one another are. This results in a simpler, cheaper and more reliable structure for the current path according to the invention.

Anhand einer Figur wird die erfindungsgemäße Schaltungsanordnung nachfolgend beschrieben.The circuit arrangement according to the invention is illustrated below with the aid of a figure described.

In der Figur sind die zum Verständnis der Erfindung wesentlichen Baugruppen und Bauteile eines Ausführungsbeispiels der Erfindung anhand eines Blockschaltbildes dargestellt. Es sind dargestellt der Tastwahlblock TWB, die Hör-Sprech-Schaltung HS, die Gleichrichterbrücke GB, der MSA-Kontakt msa und der Gabelumsctattekontåkt gu, sowie der Weckerstromkreis mit dem Hecker W und dem Kondensator C1. Weiterhin sind dargestellt zwei Feldeffekttransistoren FET1 und FET2, die mit dem Widerstand R1 in Reihe geschaltet sind und mit Hilfe des ubertragers Ü, der Gleichrichterdiode D, des Kondensators C und des Viderstandes R2 angesteuert werden.In the figure are the assemblies essential for understanding the invention and components of an exemplary embodiment of the invention on the basis of a block diagram shown. The keypad TWB, the talk-to-talk circuit, is shown HS, the rectifier bridge GB, the MSA contact msa and the Gabelumsctattekontåkt gu, as well as the alarm circuit with the Hecker W and the capacitor C1. Farther are shown two field effect transistors FET1 and FET2 connected to the resistor R1 are connected in series and with the help of the transformer Ü, the rectifier diode D, the capacitor C and the resistor R2 can be controlled.

Bei dem zwei Feldeffekttransistoren FET1 und FET2 handelt es sich um selbstleitende Feldeffekttransistoren des Verarmurgstyps, d.h. die Transistoren sind leitend bei einer Gatespannung gegenüber Source bei Null Volt. Wird an das Gate - vorausgesetzt ist ein Feldeffekttransistor mit N-Kanal - eine negative Spannung, bezcgen auf Source, gelegt so nimmt die Leitfähigkeit ab und der Transistor wird gesperrt.The two field effect transistors FET1 and FET2 are to self-conducting field effect transistors of the Verarmurgtyp, i.e. the transistors are conductive at a gate voltage with respect to the source at zero volts. Will be attached to that Gate - assuming a field effect transistor with N-channel - is a negative voltage, with respect to source, so the conductivity decreases and the transistor becomes locked.

Die Ansteuerschaltung. bestehend aus dem Ubertrager Ü, der Diode D, dem Kondensator C2 und dem Widerstand R2 wird angesteuert von der Taktspannung des Taktgenerators, der im Tastwahlblock TWB angeordnet ist, und in der Figur nicht dargestellt ist. Im Ruhezustand d.h. bei offenem Gabelumschaltekontakt gu fließt kein Speisestrom in die Teilnehmerstation, so daß der Taktgenerator im Tastwahlblock TWB nicht arbeitet. An den Gate-Anschlüssen der beiden Feldeffekttransistoren FET1 und FET2 liegt damit eine Gatespannung von Null Volt an, so daß beide Feldeffekttransitoren leitend sind.The control circuit. consisting of the transformer Ü, the diode D, the capacitor C2 and the resistor R2 is controlled by the clock voltage of the Clock generator, which is arranged in the keypad TWB, and not in the figure is shown. In the idle state, i.e. when the fork changeover contact is open, gu flows no feed current in the subscriber station, so that the clock generator in the keypad TWB does not work. At the gate connections of the two field effect transistors FET1 and FET2 is thus a gate voltage of zero volts, so that both field effect transistors are conductive.

Ist nach Abheben des Handapparates - unter der Voraussetzung daß die Teilnehmerstation an eine Vorfeldeinrichtung, z.B. an einen Wählsternschalter, angeschlossen ist - die Teilnehmerstation identifiziert, dann wird der normale Speisestrom von der Wählsternschaltung im Amt zugeschaltet. Die gesamte Schaltungs- anordnung erhält einen ausreichenden Speisestrom um betriebsbereit zu sein. Das heißt daß der Taktgenerator im Tastwahlblock TWB arbeitet, um den Wählvorganb nach dem Impuls-Wahl-Verfahren zu ermöglichen. Die Taktspannung des Taktgenerators wird nun gleichzeitig der Eingangsseite des Ubertragers U zugeführt. Die gleichgerichtete Taktspannung dient dann zur Ansteuerung der beiden Feldeffekttransistoren FET1 und FET2.Is after picking up the handset - provided that the Subscriber station connected to an apron facility, e.g. to a selector star switch is - the subscriber station is identified, then the normal supply current of connected to the dialer star circuit in the office. The entire circuit arrangement receives a sufficient supply current to be ready for operation. It means that the clock generator in the keypad TWB works to the Wählvorganb according to the pulse dialing method to enable. The clock voltage of the clock generator now becomes the input side at the same time of the transmitter U supplied. The rectified clock voltage is then used for control of the two field effect transistors FET1 and FET2.

Aus der Figur ergibt sich damit eindeutig, daß bei knliegen des normalen Speisestroms mindestens einer der beiden Feldeffekttransistoren im Sperrbetrieb betrieben wird, so daß der Strompfad aus dem Widerstand R1 und den beiden Peldeffekttransistcren PE?1 und FET2 gesperrt ist und im Normalbetrieb keinen zusätzlichen Verbraucher darstellt.The figure clearly shows that when the normal is kneeling Feed current of at least one of the two field effect transistors in blocking mode is operated, so that the current path from the resistor R1 and the two Peldeffekttransistcren PE? 1 and FET2 are blocked and there is no additional consumer in normal operation represents.

3 Patentansprüche 1 Figur L e e r s e i t e3 claims 1 figure L e r s e i t e

Claims (3)

Patentansprüche Oi Schaltungsanordnung für über -Anschlußleitungen gespeiste Teilnehmer stationen mit Wähleinrichtungen für das Impuls-Wahl-Verfahren in Fernmelde-, insbesondere Fernsprechanlagen, bei denen die Speisung über eine Gleichrichterbrücke erfolgt und die Umschaltung der Anschlußleitung von der Hör- und Sprechschaltung auf die Wähleinrichtung mittels eines bistabilen Umschalterelais erfolgt, d a d u r c h g e k e n n -z e i c h n e t , daß parallel zum Eingang der Gleichrichterbrücke (GB) ein Strompfad (Ri, FET, FET1, FET2) angeordnet ist, der ueber eine Ansteuerschaltung (AS) bei angeschaltetem Identifizierungsstrom niederohmig und bei angeschaltetem Speisestrom hochohmig geschaltet wird.Claims Oi circuit arrangement for over -connection lines powered subscriber stations with dialing devices for the pulse dialing process in telecommunications, in particular telephone systems, where the supply is via a Rectifier bridge takes place and the switching of the connection line from the hearing and speech switching to the selection device by means of a bistable switch relay takes place, d u r c h e k e n n -z e i c h n e t that parallel to the input of Rectifier bridge (GB) a current path (Ri, FET, FET1, FET2) is arranged, the Via a control circuit (AS) with the identification current switched on, it is low-resistance and is switched to high resistance when the supply current is switched on. 2. Schaltungsanordnung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß der Strompfad (Ri, FET1, FET2) aus einer Reihenschaltung eines Widerstandes (R1) und zweier selbstleitender Feldeffekttransistoren (FETl, FET2) des Verarmungstyps besteht, wobei die zwei Feldeffekttransistoren (FET1, FET2) derart in Reihe geschaltet sind, daß die beiden Source-Anschlüsse (S) miteinander verbunden sind.2. Circuit arrangement according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the current path (Ri, FET1, FET2) consists of a series connection of a Resistor (R1) and two self-conducting field effect transistors (FETl, FET2) of the depletion type, the two field effect transistors (FET1, FET2) in such a way are connected in series that the two source connections (S) are connected to one another are. 3. Schaltungsanordnung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Ansteuerschaltung (AS) im wesentlichen aus einem Übertrager (Ü) und einer Gleichrichterschaltung (D, C2) besteht, wobei der Eingang des Ubertragers (ü) mit einem vorhandenen Frequenzgenerator verbunden ist.3. Circuit arrangement according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the control circuit (AS) essentially consists of a transformer (Ü) and a rectifier circuit (D, C2), the input of the transformer (ü) is connected to an existing frequency generator.
DE19803001132 1980-01-14 1980-01-14 Telephone instrument for impulse type number selection - with switched low impedance path to facilitate subscriber identification by exchange Granted DE3001132A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19803001132 DE3001132A1 (en) 1980-01-14 1980-01-14 Telephone instrument for impulse type number selection - with switched low impedance path to facilitate subscriber identification by exchange

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Application Number Priority Date Filing Date Title
DE19803001132 DE3001132A1 (en) 1980-01-14 1980-01-14 Telephone instrument for impulse type number selection - with switched low impedance path to facilitate subscriber identification by exchange

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DE3001132A1 true DE3001132A1 (en) 1981-07-16
DE3001132C2 DE3001132C2 (en) 1987-08-13

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2503376A1 (en) * 1981-04-01 1982-10-08 Philips Nv LINE TEST CIRCUIT FOR A SUBSCRIBER TELEPHONE DEVICE
DE3203050C1 (en) * 1982-01-30 1983-01-27 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Circuit arrangement for subscriber telephone sets powered via the subscriber line with electronic control and switching means in telecommunications systems, in particular telephone systems
DE3216349A1 (en) * 1981-09-03 1983-11-10 Krone Gmbh, 1000 Berlin Identifying unit as two-terminal network for subscriber terminals
DE3402156A1 (en) * 1983-03-04 1984-09-13 Kapsch Ag, Wien Subscriber set with push-button dialling
DE3406265A1 (en) * 1984-02-21 1985-08-29 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for connecting telephone stations to a line concentrator system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2622731A1 (en) * 1976-05-21 1977-12-08 Merk Gmbh Telefonbau Fried Circuit for telephone subscriber stations - has capacitor charged by subscriber line and delivering power to dialling pulse generator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2622731A1 (en) * 1976-05-21 1977-12-08 Merk Gmbh Telefonbau Fried Circuit for telephone subscriber stations - has capacitor charged by subscriber line and delivering power to dialling pulse generator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2503376A1 (en) * 1981-04-01 1982-10-08 Philips Nv LINE TEST CIRCUIT FOR A SUBSCRIBER TELEPHONE DEVICE
DE3211811A1 (en) * 1981-04-01 1982-11-18 Naamloze Vennootschap Philips' Gloeilampenfabrieken, 5621 Eindhoven LINE TEST CIRCUIT FOR A SUBSCRIBER TELEPHONE
DE3216349A1 (en) * 1981-09-03 1983-11-10 Krone Gmbh, 1000 Berlin Identifying unit as two-terminal network for subscriber terminals
DE3203050C1 (en) * 1982-01-30 1983-01-27 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Circuit arrangement for subscriber telephone sets powered via the subscriber line with electronic control and switching means in telecommunications systems, in particular telephone systems
DE3402156A1 (en) * 1983-03-04 1984-09-13 Kapsch Ag, Wien Subscriber set with push-button dialling
DE3406265A1 (en) * 1984-02-21 1985-08-29 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for connecting telephone stations to a line concentrator system

Also Published As

Publication number Publication date
DE3001132C2 (en) 1987-08-13

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