HK49177A - A house exchange telephone system - Google Patents

A house exchange telephone system

Info

Publication number
HK49177A
HK49177A HK491/77A HK49177A HK49177A HK 49177 A HK49177 A HK 49177A HK 491/77 A HK491/77 A HK 491/77A HK 49177 A HK49177 A HK 49177A HK 49177 A HK49177 A HK 49177A
Authority
HK
Hong Kong
Prior art keywords
telephone system
exchange telephone
house exchange
house
telephone
Prior art date
Application number
HK491/77A
Inventor
C I Perkins
J Ch H Davis
J E Hollis
D W Harrison
R J Greer
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Publication of HK49177A publication Critical patent/HK49177A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
    • H04M9/007—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line wherein the key telephone sets are star-connected to a central unit by a limited number of lines
    • 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)
HK491/77A 1973-04-04 1977-09-22 A house exchange telephone system HK49177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1601673A GB1437031A (en) 1973-04-04 1973-04-04 House exchange telephone system

Publications (1)

Publication Number Publication Date
HK49177A true HK49177A (en) 1977-09-30

Family

ID=10069655

Family Applications (1)

Application Number Title Priority Date Filing Date
HK491/77A HK49177A (en) 1973-04-04 1977-09-22 A house exchange telephone system

Country Status (8)

Country Link
DE (1) DE2416122A1 (en)
FR (1) FR2224958B1 (en)
GB (1) GB1437031A (en)
HK (1) HK49177A (en)
IT (1) IT1010893B (en)
KE (1) KE2768A (en)
MY (1) MY7800011A (en)
ZA (1) ZA741829B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1595301A (en) * 1976-12-10 1981-08-12 Plessey Canada Electronic telephone system
DE3112847C2 (en) * 1981-03-31 1983-02-03 Siemens AG, 1000 Berlin und 8000 München Method for the reciprocal transmission of binary data signals via a signal line terminated at both ends with a transmitter
FR2518858A1 (en) * 1981-12-23 1983-06-24 Jeumont Schneider DEVICE FOR TRANSMITTING SIGNALS ON A LINE ALSO PROVIDING A CONTINUOUS VOLTAGE SUPPLY
SE435123B (en) * 1983-01-19 1984-09-03 Ellemtel Utvecklings Ab TELECOMMUNICATIONS TERMINAL
US4575584A (en) * 1984-07-05 1986-03-11 Honeywell Inc. Fail-safe digital phone
US4739205A (en) * 1986-02-24 1988-04-19 Rockwell International Corporation Telephone signal multiplexing system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3519757A (en) * 1968-02-27 1970-07-07 Bell Telephone Labor Inc Electronic key telephone system
US3549820A (en) * 1968-05-02 1970-12-22 Bell Telephone Labor Inc Key telephone station concentrator
US3604857A (en) * 1969-07-25 1971-09-14 Bell Telephone Labor Inc Line-oriented key telephone system

Also Published As

Publication number Publication date
MY7800011A (en) 1978-12-31
IT1010893B (en) 1977-01-20
FR2224958B1 (en) 1981-04-30
ZA741829B (en) 1975-03-26
AU6734274A (en) 1975-10-02
DE2416122C2 (en) 1987-08-13
FR2224958A1 (en) 1974-10-31
GB1437031A (en) 1976-05-26
KE2768A (en) 1977-10-21
DE2416122A1 (en) 1974-10-24

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