GB822319A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB822319A
GB822319A GB981357A GB981357A GB822319A GB 822319 A GB822319 A GB 822319A GB 981357 A GB981357 A GB 981357A GB 981357 A GB981357 A GB 981357A GB 822319 A GB822319 A GB 822319A
Authority
GB
United Kingdom
Prior art keywords
junctions
repeated
outgoing
selector
relating
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
GB981357A
Inventor
John Leslie Galvin
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB981357A priority Critical patent/GB822319A/en
Publication of GB822319A publication Critical patent/GB822319A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

822,319. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd. Feb. 10, 1958 [March 26, 1957], No. 9813/57. Drawings to Specification. Class 40 (4). In a system employing VF signalling over junctions, the incoming end of a junction terminates in a bi-directional group selector, and the arrangement is such that no separate seizing signal is required, all the impulses of the first impulse train received being repeated in- D.C. form to operate the vertical magnet. The selector described is of the 200-point type arranged for double-hunting, and may give access both to local switches and to outgoing junctions. In the former case subsequent impulse trains are repeated forward in D.C. form, while in the latter case the absence of a D.C. loop on the outgoing side effects circuit changes whereby subsequent impulse trains pass through in V.F. form.
GB981357A 1957-03-26 1957-03-26 Improvements in or relating to telephone systems Expired GB822319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB981357A GB822319A (en) 1957-03-26 1957-03-26 Improvements in or relating to telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB981357A GB822319A (en) 1957-03-26 1957-03-26 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB822319A true GB822319A (en) 1959-10-21

Family

ID=9879279

Family Applications (1)

Application Number Title Priority Date Filing Date
GB981357A Expired GB822319A (en) 1957-03-26 1957-03-26 Improvements in or relating to telephone systems

Country Status (1)

Country Link
GB (1) GB822319A (en)

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