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GB2173973B - Telephone switching system - Google Patents

Telephone switching system

Info

Publication number
GB2173973B
GB2173973B GB8509554A GB8509554A GB2173973B GB 2173973 B GB2173973 B GB 2173973B GB 8509554 A GB8509554 A GB 8509554A GB 8509554 A GB8509554 A GB 8509554A GB 2173973 B GB2173973 B GB 2173973B
Authority
GB
United Kingdom
Prior art keywords
switching system
telephone switching
telephone
switching
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
GB8509554A
Other versions
GB8509554D0 (en
GB2173973A (en
Inventor
Douglas William Barry
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8509554A priority Critical patent/GB2173973B/en
Publication of GB8509554D0 publication Critical patent/GB8509554D0/en
Publication of GB2173973A publication Critical patent/GB2173973A/en
Application granted granted Critical
Publication of GB2173973B publication Critical patent/GB2173973B/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
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42314—Systems providing special services or facilities to subscribers in private branch exchanges

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)
  • Telephonic Communication Services (AREA)
GB8509554A 1985-04-15 1985-04-15 Telephone switching system Expired GB2173973B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8509554A GB2173973B (en) 1985-04-15 1985-04-15 Telephone switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8509554A GB2173973B (en) 1985-04-15 1985-04-15 Telephone switching system

Publications (3)

Publication Number Publication Date
GB8509554D0 GB8509554D0 (en) 1985-05-22
GB2173973A GB2173973A (en) 1986-10-22
GB2173973B true GB2173973B (en) 1989-05-10

Family

ID=10577636

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8509554A Expired GB2173973B (en) 1985-04-15 1985-04-15 Telephone switching system

Country Status (1)

Country Link
GB (1) GB2173973B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5907149A (en) * 1994-06-27 1999-05-25 Polaroid Corporation Identification card with delimited usage
DE19730295C2 (en) * 1997-07-15 2001-03-15 Deutsche Telekom Ag Device for using convenience features of the telephone service on terminals connected via PABX to analogue dial-up connections of a telephone network

Also Published As

Publication number Publication date
GB8509554D0 (en) 1985-05-22
GB2173973A (en) 1986-10-22

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Legal Events

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