GB1220958A - Improvements in or relating to circuit arrangements for association with telephone lines - Google Patents

Improvements in or relating to circuit arrangements for association with telephone lines

Info

Publication number
GB1220958A
GB1220958A GB29792/68A GB2979268A GB1220958A GB 1220958 A GB1220958 A GB 1220958A GB 29792/68 A GB29792/68 A GB 29792/68A GB 2979268 A GB2979268 A GB 2979268A GB 1220958 A GB1220958 A GB 1220958A
Authority
GB
United Kingdom
Prior art keywords
counter
circuit
line
digit
pulses
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
GB29792/68A
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.)
SGS Societa Generale Semiconduttori SpA
Original Assignee
SGS Societa Generale Semiconduttori SpA
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 SGS Societa Generale Semiconduttori SpA filed Critical SGS Societa Generale Semiconduttori SpA
Publication of GB1220958A publication Critical patent/GB1220958A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/38—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)
GB29792/68A 1967-06-27 1968-06-21 Improvements in or relating to circuit arrangements for association with telephone lines Expired GB1220958A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT5224467 1967-06-27

Publications (1)

Publication Number Publication Date
GB1220958A true GB1220958A (en) 1971-01-27

Family

ID=32923002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29792/68A Expired GB1220958A (en) 1967-06-27 1968-06-21 Improvements in or relating to circuit arrangements for association with telephone lines

Country Status (5)

Country Link
US (1) US3569634A (enExample)
BE (1) BE717147A (enExample)
DE (1) DE1762452A1 (enExample)
FR (1) FR1581607A (enExample)
GB (1) GB1220958A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358640A (en) 1980-11-25 1982-11-09 Murray Leonard Q Telephone security device

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA907188A (en) * 1970-04-27 1972-08-08 Ronald C. B. Smith Electronic telephone call restricting device
CH537677A (it) * 1970-10-06 1973-05-31 It Telecommunicazioni Siemens Dispositivo di blocco alla teleselezione e ai servizi tassati in generale per apparecchi telefonici d'utente
CH541263A (it) * 1970-11-09 1973-08-31 Sits Soc It Telecom Siemens Dispositivo di blocco alla teleselezione e ai servizi tassati per apparecchi telefonici allacciati a centralini telefonici privati
US3784757A (en) * 1971-06-14 1974-01-08 Information Flow Inc Limited access dialing system
US3872260A (en) * 1972-08-10 1975-03-18 Telephonic Equipment Corp Toll call prohibitor
US3851109A (en) * 1973-05-03 1974-11-26 R Downs Telephone control system
US4008379A (en) * 1975-02-14 1977-02-15 San/Bar Corporation Touch-pad to dial conversion unit
US4284851A (en) * 1979-06-29 1981-08-18 Bell Telephone Laboratories, Incorporated Arrangement for frustrating fraudulent telephone calls
DE3622712A1 (de) * 1986-07-05 1988-01-21 Neumann Elektronik Gmbh Verfahren zur sperrung einer fernsprecheinrichtung fuer abgehende gespraeche in fernsprechanlagen mit impuls- und/oder frequenzwahl sowie waehlsperre zur durchfuehrung des verfahrens
JPH1198270A (ja) * 1997-09-19 1999-04-09 Fujitsu Ltd 通信支援装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE522252A (enExample) * 1952-08-23
US2914616A (en) * 1955-06-30 1959-11-24 Gen Telephone Lab Inc Restricted service arrangements in telephone systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358640A (en) 1980-11-25 1982-11-09 Murray Leonard Q Telephone security device

Also Published As

Publication number Publication date
US3569634A (en) 1971-03-09
DE1762452A1 (de) 1971-01-28
BE717147A (enExample) 1968-12-02
FR1581607A (enExample) 1969-09-19

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