GB689379A - Improvements in or relating to telephone signalling arrangements employing alternatin currents - Google Patents

Improvements in or relating to telephone signalling arrangements employing alternatin currents

Info

Publication number
GB689379A
GB689379A GB345/52A GB34552A GB689379A GB 689379 A GB689379 A GB 689379A GB 345/52 A GB345/52 A GB 345/52A GB 34552 A GB34552 A GB 34552A GB 689379 A GB689379 A GB 689379A
Authority
GB
United Kingdom
Prior art keywords
oscillator
line
subscriber
feed
circuit
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
GB345/52A
Other languages
English (en)
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
Publication of GB689379A publication Critical patent/GB689379A/en
Expired legal-status Critical Current

Links

Classifications

    • 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)
  • Devices For Supply Of Signal Current (AREA)
GB345/52A 1951-03-03 1952-01-04 Improvements in or relating to telephone signalling arrangements employing alternatin currents Expired GB689379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IE312453X 1951-03-03

Publications (1)

Publication Number Publication Date
GB689379A true GB689379A (en) 1953-03-25

Family

ID=11042216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB345/52A Expired GB689379A (en) 1951-03-03 1952-01-04 Improvements in or relating to telephone signalling arrangements employing alternatin currents

Country Status (7)

Country Link
US (1) US2686228A (en:Method)
BE (1) BE509657A (en:Method)
CH (1) CH312453A (en:Method)
DE (1) DE965823C (en:Method)
FR (1) FR1058881A (en:Method)
GB (1) GB689379A (en:Method)
NL (1) NL167851C (en:Method)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB956356A (en) * 1960-07-21 1964-04-22 Standard Telephones Cables Ltd Improvements in or relating to signalling methods between subscriber's sets and exchage

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1550658A (en) * 1920-12-31 1925-08-25 American Telephone & Telegraph Ringing circuits for multiplex signaling
US1864082A (en) * 1931-09-25 1932-06-21 Bell Telephone Labor Inc Telephone exchange system
US2041114A (en) * 1934-11-14 1936-05-19 Louis F B Carini Electrical discharge tube circuits
DE658606C (de) * 1935-05-01 1938-04-13 Siemens & Halske Akt Ges Schaltungsanlage fuer Fernsprechanlagen mit Waehlerbetrieb
US2191913A (en) * 1939-03-03 1940-02-27 Bell Telephone Labor Inc Telephone system
US2303654A (en) * 1940-07-12 1942-12-01 Honeywell Regulator Co Control apparatus
FR960967A (en:Method) * 1945-02-06 1950-04-28
BE483758A (en:Method) * 1947-02-20

Also Published As

Publication number Publication date
FR1058881A (fr) 1954-03-19
DE965823C (de) 1957-06-19
NL167851C (nl)
BE509657A (en:Method)
CH312453A (de) 1955-12-31
US2686228A (en) 1954-08-10

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