GB2149615B - Telephone exchange - Google Patents

Telephone exchange

Info

Publication number
GB2149615B
GB2149615B GB08329808A GB8329808A GB2149615B GB 2149615 B GB2149615 B GB 2149615B GB 08329808 A GB08329808 A GB 08329808A GB 8329808 A GB8329808 A GB 8329808A GB 2149615 B GB2149615 B GB 2149615B
Authority
GB
United Kingdom
Prior art keywords
telephone exchange
telephone
exchange
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
GB08329808A
Other versions
GB8329808D0 (en
GB2149615A (en
Inventor
Keith Allan Davidson
Michael John Ellison
Robert Alan Gatwood
Richard William Hill
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB08329808A priority Critical patent/GB2149615B/en
Publication of GB8329808D0 publication Critical patent/GB8329808D0/en
Priority to IE282284A priority patent/IE55828B1/en
Publication of GB2149615A publication Critical patent/GB2149615A/en
Application granted granted Critical
Publication of GB2149615B publication Critical patent/GB2149615B/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
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error

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)
GB08329808A 1983-11-08 1983-11-08 Telephone exchange Expired GB2149615B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08329808A GB2149615B (en) 1983-11-08 1983-11-08 Telephone exchange
IE282284A IE55828B1 (en) 1983-11-08 1984-11-02 Telephone exchange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08329808A GB2149615B (en) 1983-11-08 1983-11-08 Telephone exchange

Publications (3)

Publication Number Publication Date
GB8329808D0 GB8329808D0 (en) 1983-12-14
GB2149615A GB2149615A (en) 1985-06-12
GB2149615B true GB2149615B (en) 1987-04-15

Family

ID=10551443

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08329808A Expired GB2149615B (en) 1983-11-08 1983-11-08 Telephone exchange

Country Status (2)

Country Link
GB (1) GB2149615B (en)
IE (1) IE55828B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3812666A1 (en) * 1988-04-15 1989-11-02 Siemens Ag CIRCUIT ARRANGEMENT FOR SWITCHING A SWITCHING DEVICE FROM NORMAL SWITCHING OPERATION TO EMERGENCY OPERATION AND REVERSE
DE69131239T2 (en) * 1990-02-22 2000-02-24 Canon Kk Private branch exchange system
GB9009100D0 (en) * 1990-04-23 1990-06-20 Southwestern Bell Telecom Uk L Improvements relating to telecommunications equipment

Also Published As

Publication number Publication date
IE55828B1 (en) 1991-01-30
GB8329808D0 (en) 1983-12-14
GB2149615A (en) 1985-06-12
IE842822L (en) 1985-05-08

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 20031107