GB806086A - Improvements in or relating to electric signalling circuits - Google Patents

Improvements in or relating to electric signalling circuits

Info

Publication number
GB806086A
GB806086A GB38289/56A GB3828956A GB806086A GB 806086 A GB806086 A GB 806086A GB 38289/56 A GB38289/56 A GB 38289/56A GB 3828956 A GB3828956 A GB 3828956A GB 806086 A GB806086 A GB 806086A
Authority
GB
United Kingdom
Prior art keywords
loop
transformer
over
path
modulator
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
GB38289/56A
Other languages
English (en)
Inventor
Kenneth William Cattermole
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 GB806086A publication Critical patent/GB806086A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers
    • 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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
GB38289/56A 1956-12-14 1956-12-14 Improvements in or relating to electric signalling circuits Expired GB806086A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB356496X 1956-12-14

Publications (1)

Publication Number Publication Date
GB806086A true GB806086A (en) 1958-12-17

Family

ID=10380062

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38289/56A Expired GB806086A (en) 1956-12-14 1956-12-14 Improvements in or relating to electric signalling circuits

Country Status (4)

Country Link
BE (1) BE563171A (enrdf_load_stackoverflow)
CH (1) CH356496A (enrdf_load_stackoverflow)
DE (1) DE1046115B (enrdf_load_stackoverflow)
GB (1) GB806086A (enrdf_load_stackoverflow)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE521897A (enrdf_load_stackoverflow) * 1952-08-03

Also Published As

Publication number Publication date
DE1046115B (de) 1958-12-11
CH356496A (de) 1961-08-31
BE563171A (enrdf_load_stackoverflow)

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