GB619043A - Device for the transmission of calling and clearing signals in long distance telephonic circuits - Google Patents

Device for the transmission of calling and clearing signals in long distance telephonic circuits

Info

Publication number
GB619043A
GB619043A GB29797/45A GB2979745A GB619043A GB 619043 A GB619043 A GB 619043A GB 29797/45 A GB29797/45 A GB 29797/45A GB 2979745 A GB2979745 A GB 2979745A GB 619043 A GB619043 A GB 619043A
Authority
GB
United Kingdom
Prior art keywords
calling
transmission
long distance
circuits
clearing signals
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
GB29797/45A
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.)
S DE TELECOMM SA
Original Assignee
S DE TELECOMM SA
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 S DE TELECOMM SA filed Critical S DE TELECOMM SA
Publication of GB619043A publication Critical patent/GB619043A/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)

Abstract

619,043. Voice frequency signalling. SOC. ANON. DE TELECOMMUNICATIONS. Nov. 8, 1945, No. 29797. Convention date, April 22, 1943. Drawings to Specification. [Class 40 (iv)] In voice frequency ringing equipment for use on four-wire circuits, the low frequency and voice frequency signal generators are connected in parallel with the two-wire termination and the outgoing pair of the four-wire circuit respectively without breaking the talking circuit.
GB29797/45A 1943-04-22 1945-11-08 Device for the transmission of calling and clearing signals in long distance telephonic circuits Expired GB619043A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR619043X 1943-04-22

Publications (1)

Publication Number Publication Date
GB619043A true GB619043A (en) 1949-03-03

Family

ID=8983388

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29797/45A Expired GB619043A (en) 1943-04-22 1945-11-08 Device for the transmission of calling and clearing signals in long distance telephonic circuits

Country Status (1)

Country Link
GB (1) GB619043A (en)

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