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ES479429A1 - Mejoras exn circuitos de retencion de linea telefonica. - Google Patents

Mejoras exn circuitos de retencion de linea telefonica.

Info

Publication number
ES479429A1
ES479429A1 ES479429A ES479429A ES479429A1 ES 479429 A1 ES479429 A1 ES 479429A1 ES 479429 A ES479429 A ES 479429A ES 479429 A ES479429 A ES 479429A ES 479429 A1 ES479429 A1 ES 479429A1
Authority
ES
Spain
Prior art keywords
thyristor
exchange line
diode bridge
exchange
hold
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
ES479429A
Other languages
English (en)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Priority to ES479429A priority Critical patent/ES479429A1/es
Publication of ES479429A1 publication Critical patent/ES479429A1/es
Priority to DE3013342A priority patent/DE3013342C2/de
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/80—Telephone line holding circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/428—Arrangements for placing incoming calls on hold
    • H04M3/4283—Call holding circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

Mejoras en circuitos de retención de línea telefónica, utilizados para desconectar el circuito de conversación sin que la línea se libere, caracterizadas por hacer uso de un circuito electrónico simple, económico y fiable, consistente en: un tiristor (T1), que presenta baja impedancia cuando conduce y alta impedancia cuando está bloqueado; un contacto (R), correspondiente a un botón inestable, que sirve para desbloquear el tiristor corotocircuitado momentáneamente su puerta y ánodo, un puente de diodos (D1...D4), utilizado para independizar al tiristor de la polaridad que tenga la línea; un zener (Z2), que junto con los anteriores puentes y tiristor establece la tensión de línea por debajo de la cual el tiristor quedará bloqueado y conmutador a alta impedancia; un diodo zener bilateral (Z1), o normal (Z''), para proteger el dispositivo de transitorios.
ES479429A 1979-04-09 1979-04-09 Mejoras exn circuitos de retencion de linea telefonica. Expired ES479429A1 (es)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES479429A ES479429A1 (es) 1979-04-09 1979-04-09 Mejoras exn circuitos de retencion de linea telefonica.
DE3013342A DE3013342C2 (de) 1979-04-09 1980-04-05 Schaltungsanordnung für Fernsprechapparate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES479429A ES479429A1 (es) 1979-04-09 1979-04-09 Mejoras exn circuitos de retencion de linea telefonica.

Publications (1)

Publication Number Publication Date
ES479429A1 true ES479429A1 (es) 1979-11-01

Family

ID=8478018

Family Applications (1)

Application Number Title Priority Date Filing Date
ES479429A Expired ES479429A1 (es) 1979-04-09 1979-04-09 Mejoras exn circuitos de retencion de linea telefonica.

Country Status (2)

Country Link
DE (1) DE3013342C2 (es)
ES (1) ES479429A1 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3524454A1 (de) * 1985-07-09 1987-01-15 Norbert Moch Schaltungsanordnung fuer das anschliessen von mehreren telefonapparaten an einen teilnehmeranschluss einer telefonanlage
FR2630872A1 (fr) * 1988-05-02 1989-11-03 Lege Jean Claude Dispositif de mise en garde d'une ligne telephonique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3725600A (en) * 1969-12-18 1973-04-03 American Telephone & Telegraph Communication call holding circuit
US3895192A (en) * 1974-07-25 1975-07-15 Bell Telephone Labor Inc Telephone line circuit hold control arrangement

Also Published As

Publication number Publication date
DE3013342A1 (de) 1980-10-30
DE3013342C2 (de) 1985-01-10

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