IT939927B - Sistema selettivo di segnalazione particolarmente per linee interne - Google Patents

Sistema selettivo di segnalazione particolarmente per linee interne

Info

Publication number
IT939927B
IT939927B IT70255/71A IT7025571A IT939927B IT 939927 B IT939927 B IT 939927B IT 70255/71 A IT70255/71 A IT 70255/71A IT 7025571 A IT7025571 A IT 7025571A IT 939927 B IT939927 B IT 939927B
Authority
IT
Italy
Prior art keywords
signaling system
system particularly
internal lines
selective signaling
selective
Prior art date
Application number
IT70255/71A
Other languages
English (en)
Original Assignee
Western Electric Co
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 Western Electric Co filed Critical Western Electric Co
Application granted granted Critical
Publication of IT939927B publication Critical patent/IT939927B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
IT70255/71A 1970-10-05 1971-10-04 Sistema selettivo di segnalazione particolarmente per linee interne IT939927B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7805370A 1970-10-05 1970-10-05

Publications (1)

Publication Number Publication Date
IT939927B true IT939927B (it) 1973-02-10

Family

ID=22141632

Family Applications (1)

Application Number Title Priority Date Filing Date
IT70255/71A IT939927B (it) 1970-10-05 1971-10-04 Sistema selettivo di segnalazione particolarmente per linee interne

Country Status (8)

Country Link
US (1) US3651274A (it)
JP (1) JPS5535908B1 (it)
AU (1) AU468656B2 (it)
CA (1) CA947851A (it)
DE (1) DE2148869A1 (it)
FR (1) FR2110969A5 (it)
GB (1) GB1352238A (it)
IT (1) IT939927B (it)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778554A (en) * 1971-05-24 1973-12-11 Bell Telephone Labor Inc Single three-wire-port pbx intercom trunk circuit arrangement
US4000375A (en) * 1975-02-20 1976-12-28 Hachishiro Kawamura Automatic call transfer circuit for a plurality of telephones
US4049914A (en) * 1976-08-30 1977-09-20 Rockwell International Corporation Frequency division multiplex voice communication apparatus with hierarchy of stations
CA1200036A (en) * 1978-03-13 1986-01-28 Guido Panizzon Partyline subscriber interface circuit
AU535333B2 (en) * 1979-07-25 1984-03-15 L M Ericsson Pty. Ltd. Loop sharing in digital systems
US4744103A (en) * 1985-11-27 1988-05-10 Rauland-Borg Corporation Computer controlled multi-link communication system
US5978461A (en) * 1998-01-20 1999-11-02 Ground Zero Engineering, L.L.C. Telephone switching system with internal and external channel
US7023975B2 (en) * 2001-08-14 2006-04-04 Sharp Laboratories Of America, Inc. Privacy mode system and method for home network telephone

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2221655A (en) * 1936-10-26 1940-11-12 Zwietusch E & Co Gmbh Party line telephone system
US2395798A (en) * 1942-12-17 1946-03-05 Bell Telephone Labor Inc Traffic control system

Also Published As

Publication number Publication date
CA947851A (en) 1974-05-21
JPS479152A (it) 1972-05-12
JPS5535908B1 (it) 1980-09-17
FR2110969A5 (it) 1972-06-02
DE2148869A1 (de) 1972-04-06
US3651274A (en) 1972-03-21
AU3375471A (en) 1973-03-29
GB1352238A (en) 1974-05-08
AU468656B2 (en) 1976-01-22

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