GB1432666A - System for detecting looping of a subscribers telephone line - Google Patents

System for detecting looping of a subscribers telephone line

Info

Publication number
GB1432666A
GB1432666A GB3298973A GB3298973A GB1432666A GB 1432666 A GB1432666 A GB 1432666A GB 3298973 A GB3298973 A GB 3298973A GB 3298973 A GB3298973 A GB 3298973A GB 1432666 A GB1432666 A GB 1432666A
Authority
GB
United Kingdom
Prior art keywords
ringing
relay
diode
zener diode
current
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
GB3298973A
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.)
Jeumont Schneider SA
Original Assignee
Jeumont Schneider 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 Jeumont Schneider SA filed Critical Jeumont Schneider SA
Publication of GB1432666A publication Critical patent/GB1432666A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
GB3298973A 1972-07-20 1973-07-11 System for detecting looping of a subscribers telephone line Expired GB1432666A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7226123A FR2193529A5 (enExample) 1972-07-20 1972-07-20

Publications (1)

Publication Number Publication Date
GB1432666A true GB1432666A (en) 1976-04-22

Family

ID=9102110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3298973A Expired GB1432666A (en) 1972-07-20 1973-07-11 System for detecting looping of a subscribers telephone line

Country Status (10)

Country Link
US (1) US3882282A (enExample)
JP (1) JPS4992910A (enExample)
BE (1) BE802532A (enExample)
CA (1) CA990422A (enExample)
DE (1) DE2335038B2 (enExample)
FR (1) FR2193529A5 (enExample)
GB (1) GB1432666A (enExample)
IT (1) IT989882B (enExample)
LU (1) LU68043A1 (enExample)
NL (1) NL7310043A (enExample)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH600714A5 (enExample) * 1974-09-24 1978-06-30 Siemens Ag Albis
DE2547880C2 (de) * 1975-10-25 1981-09-24 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur Erkennung von Betriebszuständen einer Teilnehmerleitung und zur Rufanschaltung sowie Rufabschaltung in Fernsprechvermittlungsanlagen
JPS5369504A (en) * 1976-12-02 1978-06-21 Fujitsu Ltd Ring trip circuit
FR2451682A1 (fr) * 1979-03-12 1980-10-10 Jeumont Schneider Dispositif d'appel pour installation telephonique automatique d'abonne avec postes supplementaires
DE2911584C2 (de) * 1979-03-23 1981-06-11 Siemens AG, 1000 Berlin und 8000 München Teilnehmeranschlußschaltung mit Erdtastenbetätigungsindikation, hochohmig schaltbarer Speisung und Einrichtung zur Rufsignalerzeugung
DE4019365A1 (de) * 1990-06-18 1991-12-19 Philips Patentverwaltung Schaltungsanordnung fuer ein teilnehmergeraet

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL267227A (enExample) * 1960-07-21
US3145266A (en) * 1961-06-29 1964-08-18 Gen Electric A. c. static switching circuits

Also Published As

Publication number Publication date
BE802532A (fr) 1973-11-16
LU68043A1 (enExample) 1973-09-26
JPS4992910A (enExample) 1974-09-04
US3882282A (en) 1975-05-06
NL7310043A (enExample) 1974-01-22
FR2193529A5 (enExample) 1974-02-15
CA990422A (fr) 1976-06-01
DE2335038B2 (de) 1975-04-17
DE2335038A1 (de) 1974-02-14
IT989882B (it) 1975-06-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee