ES479429A1 - Multiple extension exchange line hold circuit - uses diode bridge and switchable thyristor with LED indication to hold exchange line loop - Google Patents

Multiple extension exchange line hold circuit - uses diode bridge and switchable thyristor with LED indication to hold exchange line loop

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
Spanish (es)
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/en
Publication of ES479429A1 publication Critical patent/ES479429A1/en
Priority to DE3013342A priority patent/DE3013342C2/en
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

A diode bridge, with thyristor, and LED indication circuits holds a telephone exchange connection whilst the telephone speech circuit is disconnected to talk to a further extension prior to transfer of the call to that extension. The diode bridge makes the controlling thyristor, which holds the exchange loop, independent of the voltage polarity on the exchange line. The diode bridge (D1-D4) is connected across the exchange line (L1, L2) at a point on the exchange side of the switch hook springset in the telephone and ensures the correct polarity on a Zener diode (Z2) and thyristor (T1) in the holding circuit. In normal condition the thyristor (T1) is non-conducting and no current is drawn from the exchange line. The thyristor (T1) is turned on by operating a key (Re to short the gate and anode. An LED may be connected in series with the thyristor to indicate a held line.
ES479429A 1979-04-09 1979-04-09 Multiple extension exchange line hold circuit - uses diode bridge and switchable thyristor with LED indication to hold exchange line loop Expired ES479429A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES479429A ES479429A1 (en) 1979-04-09 1979-04-09 Multiple extension exchange line hold circuit - uses diode bridge and switchable thyristor with LED indication to hold exchange line loop
DE3013342A DE3013342C2 (en) 1979-04-09 1980-04-05 Circuit arrangement for telephone sets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES479429A ES479429A1 (en) 1979-04-09 1979-04-09 Multiple extension exchange line hold circuit - uses diode bridge and switchable thyristor with LED indication to hold exchange line loop

Publications (1)

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

Family

ID=8478018

Family Applications (1)

Application Number Title Priority Date Filing Date
ES479429A Expired ES479429A1 (en) 1979-04-09 1979-04-09 Multiple extension exchange line hold circuit - uses diode bridge and switchable thyristor with LED indication to hold exchange line loop

Country Status (2)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3524454A1 (en) * 1985-07-09 1987-01-15 Norbert Moch Circuit arrangement for connecting a plurality of telephone sets to a subscriber terminal of a telephone system
FR2630872A1 (en) * 1988-05-02 1989-11-03 Lege Jean Claude Device for putting a telephone line on hold

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 (en) 1980-10-30
DE3013342C2 (en) 1985-01-10

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