GB709406A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB709406A
GB709406A GB1971053A GB1971053A GB709406A GB 709406 A GB709406 A GB 709406A GB 1971053 A GB1971053 A GB 1971053A GB 1971053 A GB1971053 A GB 1971053A GB 709406 A GB709406 A GB 709406A
Authority
GB
United Kingdom
Prior art keywords
impulse
voice
dialled
july
automatic
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
GB1971053A
Inventor
Charles Edmond Beale
Gilbert Jessop Becket
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
Publication of GB709406A publication Critical patent/GB709406A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)

Abstract

709,406. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd. July 3, 1952 [July 6, 1951], No. 19710/53. Divided out of 709,399. Drawings to Specification. Class 40 (4) In a system employing voice-frequency impulse signals for setting up, control and supervision of connections extending over routes connecting widely separated exchanges, a terminating exchange is provided at the incoming end of an inter-exchange route with equipment which subsequent to seizure is adapted in response to a voice-frequency signal representing a dialled impulse to open the forwardly extending d.c. loop circuit for a period equivalent to the duration of said dialled impulse and in response to a voicefrequency signal having a persistence which is long compared with a dialled impulse to open said loop circuit for a period substantially equivalent to the longest dialling impulse likely to be received. A sufficiently prolonged voice-frequency signal brings about a second and continuous opening of the loop to initiate the release of the automatic switching equipment. The invention is described with reference to a system identical with that described in Specification 709,399.
GB1971053A 1951-07-06 1951-07-06 Improvements in or relating to telephone systems Expired GB709406A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1605051A GB709399A (en) 1951-07-06 1951-07-06 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB709406A true GB709406A (en) 1954-05-26

Family

ID=10070232

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1605051A Expired GB709399A (en) 1951-07-06 1951-07-06 Improvements in or relating to telephone systems
GB1971053A Expired GB709406A (en) 1951-07-06 1951-07-06 Improvements in or relating to telephone systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1605051A Expired GB709399A (en) 1951-07-06 1951-07-06 Improvements in or relating to telephone systems

Country Status (3)

Country Link
BE (1) BE512649A (en)
GB (2) GB709399A (en)
NL (2) NL170585B (en)

Also Published As

Publication number Publication date
BE512649A (en)
NL170585B (en)
NL83809C (en)
GB709399A (en) 1954-05-26

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