GB451495A - Improvements in and relating to electrical communication systems - Google Patents

Improvements in and relating to electrical communication systems

Info

Publication number
GB451495A
GB451495A GB13235A GB13235A GB451495A GB 451495 A GB451495 A GB 451495A GB 13235 A GB13235 A GB 13235A GB 13235 A GB13235 A GB 13235A GB 451495 A GB451495 A GB 451495A
Authority
GB
United Kingdom
Prior art keywords
line
calling
station
carrier
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
GB13235A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB13235A priority Critical patent/GB451495A/en
Publication of GB451495A publication Critical patent/GB451495A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

451,495. Manual exchange systems. PADDLE, L. H., 92, Lancaster Road, West Norwood, London. Jan. 2, 1935, No. 132. [Class 40 (iv)] [See also Group XL] Calling is initiated by placing D.C. on the speaking circuit of the calling operator to operate means whereby the call indicator at the calling station is rendered inoperative, the call being effected by transmitting to the called station a carrier or voice frequency signal. When the called operator replies, she places D.C. on her line which causes the call indicator at her station to be disconnected, the circuits being then in condition for communication. In the carrier system shown in Fig. 1, D.C. placed on line EX operates A which disables the incoming-call indicating- relay E and removes a shunt on the transmitting path whereby carrier from OSC is placed on the line. At the called station, the carrier passes HFF to detector V which releases C in its anode circuit whereupon D pulls up and operates E which connects ringing current to a bell or indicator. When the called operator replies, D.C. placed on her line operates relay A at called station whereupon E falls back and B pulls up, holds independent of A and maintains E unoperated. At the calling station, the received carrier releases C whereupon D and B pull up. The use of a separate valve V may be avoided by employing the detector valve in the demodulator as the control valve. In the modification shown in Fig. 2, primarily used for voice-frequency signalling, D.C. on calling line EX operates AA which disconnects the voice-frequency receiving equipment V, BB. A voice-frequency calling signal is then sent to line in a manner not shown and, at the called station, releases BB to connect up a local ringing source. In using this modification for carrier working, the release of BB at the called station operates auxiliary relays which apply intermittent ringing to the line, AA operating during a silent interval when D.C. is applied in response to the call.
GB13235A 1935-01-02 1935-01-02 Improvements in and relating to electrical communication systems Expired GB451495A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB13235A GB451495A (en) 1935-01-02 1935-01-02 Improvements in and relating to electrical communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13235A GB451495A (en) 1935-01-02 1935-01-02 Improvements in and relating to electrical communication systems

Publications (1)

Publication Number Publication Date
GB451495A true GB451495A (en) 1936-08-04

Family

ID=9698975

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13235A Expired GB451495A (en) 1935-01-02 1935-01-02 Improvements in and relating to electrical communication systems

Country Status (1)

Country Link
GB (1) GB451495A (en)

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