GB655546A - Improvements in or relating to electric signalling systems - Google Patents

Improvements in or relating to electric signalling systems

Info

Publication number
GB655546A
GB655546A GB1145247A GB1145247A GB655546A GB 655546 A GB655546 A GB 655546A GB 1145247 A GB1145247 A GB 1145247A GB 1145247 A GB1145247 A GB 1145247A GB 655546 A GB655546 A GB 655546A
Authority
GB
United Kingdom
Prior art keywords
wire
signal
attenuated
relay
operates
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
GB1145247A
Inventor
Esmond Philip Goodwin Wright
Marc Van Hasselt
Donald Adams Weir
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 GB1145247A priority Critical patent/GB655546A/en
Publication of GB655546A publication Critical patent/GB655546A/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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

655,546. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd. April 23, 1948, No. 11452. [Class 40 (iv] In a 4-wire to 2-wire connection, one leg GC of the 4-wire circuit is normally split or attenuated at contacts of a relay ES between the receiver GR and a hybrid coil IH. Numerical signals received by a voice-frequency receiver GR are transmitted over an auxiliary channel GX (not shown), and the talking circuit is completed when ES is operated by an end-of-selection signal. A non-numerical signal operates F1 or F2 and C and is preceded by a prefix which operates F1, F2 together. Relay PXT follows F1, F2 when operated together and splits or attenuates the line until the end of the signal. The line may be attenuated as described in Specification 654,674.
GB1145247A 1948-04-23 1948-04-23 Improvements in or relating to electric signalling systems Expired GB655546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1145247A GB655546A (en) 1948-04-23 1948-04-23 Improvements in or relating to electric signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1145247A GB655546A (en) 1948-04-23 1948-04-23 Improvements in or relating to electric signalling systems

Publications (1)

Publication Number Publication Date
GB655546A true GB655546A (en) 1951-07-25

Family

ID=9986513

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1145247A Expired GB655546A (en) 1948-04-23 1948-04-23 Improvements in or relating to electric signalling systems

Country Status (1)

Country Link
GB (1) GB655546A (en)

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