DE936878C - Circuit arrangement for long-distance line transmissions in telecommunications, in particular telephone systems - Google Patents

Circuit arrangement for long-distance line transmissions in telecommunications, in particular telephone systems

Info

Publication number
DE936878C
DE936878C DET8688A DET0008688A DE936878C DE 936878 C DE936878 C DE 936878C DE T8688 A DET8688 A DE T8688A DE T0008688 A DET0008688 A DE T0008688A DE 936878 C DE936878 C DE 936878C
Authority
DE
Germany
Prior art keywords
long
circuit arrangement
telecommunications
telephone systems
particular telephone
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
Application number
DET8688A
Other languages
German (de)
Inventor
Adolf Schmid
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.)
Tenovis GmbH and Co KG
Original Assignee
Telefonbau und Normalzeit GmbH
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 Telefonbau und Normalzeit GmbH filed Critical Telefonbau und Normalzeit GmbH
Priority to DET8688A priority Critical patent/DE936878C/en
Application granted granted Critical
Publication of DE936878C publication Critical patent/DE936878C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Description

In Übertragungen für Fernmelde-, insbesondere Fernsprechanlagen muß für die Zwecke der Übertragung von Signalen eine Wechselstromquelle an die Fernleitung geschaltet werden. Dabei ist dafür Sorge getragen, daß vor der Einschaltung der Wechselstromquclle die Fernleitung ordnungsgemäß abgeschlossen ist und während der Anschaltung der Wechselstromquelle eine Kopplung mehrerer Fernleitungen über die gemeinsame Wechselstromquelle vermieden wird.In transmissions for telecommunications, especially telephone systems, must a source of AC power to the trunk line for the purpose of transmitting signals be switched. Care must be taken to ensure that the AC power source the transmission line is properly terminated and during the Connection of the alternating current source a coupling of several long-distance lines via the common AC power source is avoided.

Die Erfindung bezweckt, diese verschiedenen Bedingungen in besonders einfacher Weise zu erfüllen. Dies erreicht die Erfindung dadurch, daß die Wechselstromquelle zur Signalgabe in der Mitte eines Dämpfungsgliedes angeschaltet wird. Mit Vorteil verwendet die Erfindung zur Anschaltung der Wechselstromquelle das Dämpfungsglied, welches zum ordnungsgemäßen Abschluß der Fern-Leitung und zur Pegelhaltung am Verstärkereingang sowieso vorgesehen ist. Durch die Anschaltung der Wechselstromquelle an die Mitte eines solchen Dämpfungsgliedes wird zwangläufig der Abschluß der Fernleitung im Ruhezustand und eine ausreichende Übersprechdämpfung zwischen mehreren Fernteitungen erreicht, an welche gleichzeitig die gemeinsame Wechselstromquelle zur Signalgabe angeschaltet ist.The invention aims at these various conditions in particular easy way to meet. This is achieved by the invention in that the alternating current source is switched on for signaling in the middle of an attenuator. With advantage the invention uses the attenuator to connect the AC power source, which is used to properly terminate the remote line and to maintain the level at the amplifier input is provided anyway. By connecting the AC power source to the center such an attenuator is inevitably the termination of the long-distance line in Quiescent state and sufficient crosstalk attenuation between several remote lines reached, to which at the same time the common AC power source for signaling is turned on.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Diese zeigt schematisch die Übertragungen an beiden Enden einer vierdrahtigen Fernleitung. In dem Ast V der Fernleitung FL liegt ein Dämpfungsglied D i. Die Mitte dieses Dämpfungsgliedes ist über Kontakte ca I i und a 13 miteinander verbunden. Werden diese Kontakte betätigt, dann schalten sie eine Wechselstromquelle WQ in der Mitte des Dämpfungsgliedes ein, so daß Wechselstrom über beide Adern des Astes V der Fernleitung FL fließt und an dem anderen Ende der Fernleitung von dem Empfänger E aufgenommen wird. Das Dämpfungsglied D:2 schließt für gewöhnlich den Ast V von der Fernleitung ab und sichert den richtigen Eingangspegel an dem Verstärker. Besitzen die Längswiderstände d i bis d q. beispielsweise je 138 Ohm und die Querwiderstände d5 und d6 je 255 Ohm Widerstand, dann beträgt der Leitungsabschluß 787 Ohm.An embodiment of the invention is shown in the drawing. This shows schematically the transmissions at both ends of a four-wire trunk line. In the branch V of the long-distance line FL there is an attenuator D i. The center of this attenuator is connected to one another via contacts ca I i and a 1 3. If these contacts are actuated, they switch on an alternating current source WQ in the middle of the attenuator so that alternating current flows over both wires of branch V of the trunk line FL and is picked up by the receiver E at the other end of the trunk line. The attenuator D: 2 usually closes the branch V from the trunk line and ensures the correct input level to the amplifier. Have the series resistances d i to d q. for example 138 ohms each and the cross resistances d5 and d6 each 255 ohms resistance, then the line termination is 787 ohms.

Zwei gleichzeitig an die Wechselstromquelle WQ angeschaltete Fernleitungen sind über eine Dämpfung von 6,4 N miteinander verbunden, wenn der Innenwiderstand der Wechselstromquelle klein (etwa 3 Ohm) ist.Two long-distance lines connected to the AC power source WQ at the same time are connected to one another via a damping of 6.4 N if the internal resistance the AC power source is small (about 3 ohms).

Durch die Einschaltung der Wechselstromquelle in der Mitte eines Dämpfungsgliedes werden besondere Kontakte in der Sprechleitung vermieden. Die dargestellte Anordnung ist so getroffen, daß in der Sprechleitung lediglich Kontakte g eines Relais liegen, welches erst während des Sprechzustandes erregt wird und die Sprechleitung durchschaltet.By switching on the alternating current source in the middle of an attenuator special contacts in the voice line are avoided. The arrangement shown is made in such a way that only contacts g of a relay are in the speech line, which is only excited during the speech state and switches through the speech line.

Claims (2)

PATENTANSPRÜCHE: i. Schaltungsanordnung für Fernleitungsübcrtragungen in Fernmelde-, insbesondere Fernsprechanlagen, dadurch gekennzeichnet, daß die Wechselstromquelle zur Signalgabe in der Mitte eines Dämpfungsgliedes angeschaltet wird. PATENT CLAIMS: i. Circuit arrangement for long-distance line transmissions in telecommunication systems, in particular telephone systems, characterized in that the alternating current source for signaling is switched on in the middle of an attenuator. 2. Schaltungsanordnung nach Anspruch i, dadurch gekennzeichnet, daß die Anschaltung der Wechselstromquelle in der Mitte des die Fernleitung abschließenden Dämpfungsgliedes angeschaltet wird, welches zur Pegelhaltung am Verstärkereingang dient.2. Circuit arrangement according to claim i, characterized in that the connection of the alternating current source is switched on in the middle of the attenuator terminating the capillary, which is used to maintain the level at the amplifier input.
DET8688A 1953-11-26 1953-11-26 Circuit arrangement for long-distance line transmissions in telecommunications, in particular telephone systems Expired DE936878C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET8688A DE936878C (en) 1953-11-26 1953-11-26 Circuit arrangement for long-distance line transmissions in telecommunications, in particular telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET8688A DE936878C (en) 1953-11-26 1953-11-26 Circuit arrangement for long-distance line transmissions in telecommunications, in particular telephone systems

Publications (1)

Publication Number Publication Date
DE936878C true DE936878C (en) 1955-12-22

Family

ID=7545913

Family Applications (1)

Application Number Title Priority Date Filing Date
DET8688A Expired DE936878C (en) 1953-11-26 1953-11-26 Circuit arrangement for long-distance line transmissions in telecommunications, in particular telephone systems

Country Status (1)

Country Link
DE (1) DE936878C (en)

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