GB1480226A - Telephone intercommunication systems - Google Patents

Telephone intercommunication systems

Info

Publication number
GB1480226A
GB1480226A GB5453276A GB5453276A GB1480226A GB 1480226 A GB1480226 A GB 1480226A GB 5453276 A GB5453276 A GB 5453276A GB 5453276 A GB5453276 A GB 5453276A GB 1480226 A GB1480226 A GB 1480226A
Authority
GB
United Kingdom
Prior art keywords
local
intercommunication systems
call
key
telephone intercommunication
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
GB5453276A
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.)
GTE International Inc
Original Assignee
GTE International 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 GTE International Inc filed Critical GTE International Inc
Priority to GB5453276A priority Critical patent/GB1480226A/en
Publication of GB1480226A publication Critical patent/GB1480226A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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

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)

Abstract

1480226 Intercommunication systems GTE INTERNATIONAL Inc 10 July 1974 [26 Oct 1973] 54532/76 Divided out of 1480221 Heading H4K The system is identical to the second embodiment described in Specification 1,480,223. The claim relates to an intercom system having a common line to which all extensions are normally connected, each extension station incorporating a key set having two sets of contacts in respect of each digit key. For a local call one contact set is used for signalling directly over a local multiwire bus whereas for an external exchange call the other set is used for controlling the transmission of coded "dialling" signals.
GB5453276A 1974-07-10 1974-07-10 Telephone intercommunication systems Expired GB1480226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5453276A GB1480226A (en) 1974-07-10 1974-07-10 Telephone intercommunication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5453276A GB1480226A (en) 1974-07-10 1974-07-10 Telephone intercommunication systems

Publications (1)

Publication Number Publication Date
GB1480226A true GB1480226A (en) 1977-07-20

Family

ID=10471324

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5453276A Expired GB1480226A (en) 1974-07-10 1974-07-10 Telephone intercommunication systems

Country Status (1)

Country Link
GB (1) GB1480226A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176291A2 (en) * 1984-09-21 1986-04-02 Alcatel N.V. Key telephone system with distributed control
GB2179523A (en) * 1985-08-23 1987-03-04 Ferranti Gte Limited Private telephone system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176291A2 (en) * 1984-09-21 1986-04-02 Alcatel N.V. Key telephone system with distributed control
EP0176291A3 (en) * 1984-09-21 1988-03-30 Alcatel N.V. Key telephone system with distributed control
GB2179523A (en) * 1985-08-23 1987-03-04 Ferranti Gte Limited Private telephone system
GB2179523B (en) * 1985-08-23 1989-07-19 Ferranti Gte Limited Private telephone system

Similar Documents

Publication Publication Date Title
GB1342781A (en) Communication systems
CA1265274C (en) Radio key telephone system having a common signaling channel
GB1466162A (en) Telecommunications systems
GB1013594A (en) Improvements in communication switching systems
ES474717A1 (en) Communication system call transfer arrangement
GB1464002A (en) Time division switching systems
GB1521127A (en) Telecommunication systems
GB1480226A (en) Telephone intercommunication systems
ES8202228A1 (en) Circuit arrangement for a telephone exchange, particularly for a private automatic branch exchange, with a message store for recalling.
GB1059535A (en) Intercommunication system with voice-frequency key dialling
ES8704061A1 (en) Small key telephone system
GB1453496A (en) Serial intercommunication system with a centrla control
GB1514329A (en) Tdm telecommunications systems
GB1502665A (en) Satelite telephone systems
GB1369670A (en) Communication systems
GB1099697A (en) Improvements in or relating to private branch exchange telephone switching systems
GB1464615A (en) House-exchange telephone system
GB1029204A (en) Improvements in or relating to telephone switching systems
GB1084099A (en)
JPS56126364A (en) Circuit switching system
GB1270558A (en) Mobile selective calling systems
GB1473370A (en) Intercommunication systems
GB1082734A (en) Land-to-mobile telephone link
GB705430A (en) Improvements in or relating to telephone instruments
GB1043839A (en) Method to mark calls in telephone connections, equipped with automatic call transfer

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee