GB465238A - Improvements in or relating to telegraph signalling systems - Google Patents

Improvements in or relating to telegraph signalling systems

Info

Publication number
GB465238A
GB465238A GB20527/36A GB2052736A GB465238A GB 465238 A GB465238 A GB 465238A GB 20527/36 A GB20527/36 A GB 20527/36A GB 2052736 A GB2052736 A GB 2052736A GB 465238 A GB465238 A GB 465238A
Authority
GB
United Kingdom
Prior art keywords
line
current
spacing
relay
winding
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
GB20527/36A
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 GB465238A publication Critical patent/GB465238A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/207—Repeater circuits; Relay circuits using electromagnetic switches

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Dc Digital Transmission (AREA)

Abstract

465,238. Code telegraphy. STANDARD TELEPHONES & CABLES, Ltd. July 24, 1936, No. 20527. Convention date, Aug. 30, 1935. [Class 40 (iii)] A repeater comprises contacts (of relay 101) for impressing signal conditions of either polarity on the outgoing side of the line and a receiving relay 102 for signals in the opposite direction and having two windings one of which is connected to the return side of the line whereas the other is a balancing winding connected to said contacts. The repeater is adjusted for different lines by a resistance 103 and the balancing circuit includes an artificial line 107 which may be a resistance. On transmission of a marking condition relay 102 is held in the marking condition by current in its line winding which is approximately twice the current (spacing) in the balancing winding. On transmission of a spacing condition, the line is substantially without current and the balancing winding of 102 is in a direction holding the relay in marking position. Current surges due to line capacity to ground do not affect 102. To prevent 102 from being changed over by spacing current in the balancing winding on transmission of a marking impulse due to the delay of the impulse by the line, a capacity network 106 may be connected as shown or an inductance 105 may be used to delay the arrival of spacing current in the balancing winding.
GB20527/36A 1935-08-30 1936-07-24 Improvements in or relating to telegraph signalling systems Expired GB465238A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US38526A US2123232A (en) 1935-08-30 1935-08-30 Telegraph signal repeater

Publications (1)

Publication Number Publication Date
GB465238A true GB465238A (en) 1937-05-04

Family

ID=21900451

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20527/36A Expired GB465238A (en) 1935-08-30 1936-07-24 Improvements in or relating to telegraph signalling systems

Country Status (2)

Country Link
US (1) US2123232A (en)
GB (1) GB465238A (en)

Also Published As

Publication number Publication date
US2123232A (en) 1938-07-12

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