GB1352238A - Control arrangement for private line communication system - Google Patents

Control arrangement for private line communication system

Info

Publication number
GB1352238A
GB1352238A GB4548671A GB4548671A GB1352238A GB 1352238 A GB1352238 A GB 1352238A GB 4548671 A GB4548671 A GB 4548671A GB 4548671 A GB4548671 A GB 4548671A GB 1352238 A GB1352238 A GB 1352238A
Authority
GB
United Kingdom
Prior art keywords
station
call
stations
data
hook
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
GB4548671A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Inc filed Critical Western Electric Co Inc
Publication of GB1352238A publication Critical patent/GB1352238A/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
    • H04M1/68—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)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)
GB4548671A 1970-10-05 1971-09-30 Control arrangement for private line communication system Expired GB1352238A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1352238A true GB1352238A (en) 1974-05-08

Family

ID=22141632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4548671A Expired GB1352238A (en) 1970-10-05 1971-09-30 Control arrangement for private line communication system

Country Status (8)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2183968A (en) * 1985-11-27 1987-06-10 Rauland Corp Intercommunication system

Families Citing this family (7)

* 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
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2183968A (en) * 1985-11-27 1987-06-10 Rauland Corp Intercommunication system
US4744103A (en) * 1985-11-27 1988-05-10 Rauland-Borg Corporation Computer controlled multi-link communication system
GB2183968B (en) * 1985-11-27 1989-11-08 Rauland Corp Computer controlled multi-link communication system

Also Published As

Publication number Publication date
JPS5535908B1 (https=) 1980-09-17
AU468656B2 (en) 1976-01-22
AU3375471A (en) 1973-03-29
CA947851A (en) 1974-05-21
JPS479152A (https=) 1972-05-12
FR2110969A5 (https=) 1972-06-02
DE2148869A1 (de) 1972-04-06
US3651274A (en) 1972-03-21
IT939927B (it) 1973-02-10

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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