GB729439A - Improvements in and relating to electrical switching arrangements suitable for use in electric telegraph systems - Google Patents

Improvements in and relating to electrical switching arrangements suitable for use in electric telegraph systems

Info

Publication number
GB729439A
GB729439A GB2953151A GB2953151A GB729439A GB 729439 A GB729439 A GB 729439A GB 2953151 A GB2953151 A GB 2953151A GB 2953151 A GB2953151 A GB 2953151A GB 729439 A GB729439 A GB 729439A
Authority
GB
United Kingdom
Prior art keywords
valve
line
station
contacts
rectifier
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
GB2953151A
Inventor
Gordon Taylor Dain
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.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research Ltd
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 British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Priority to GB2953151A priority Critical patent/GB729439A/en
Publication of GB729439A publication Critical patent/GB729439A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/18—Automatic changing of the traffic direction
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

729,439. Two-way transmission. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. Nov. 20, 1952 [Dec. 17, 1951], No. 29531/51. Class 40 (4). [Also in Group XL (b)] A switching arrangement for a signalling system arranged for two-way transmission over separate conductors and employing a piece of equipment at an intermediate point in common for both directions of transmission in which a control unit arranged to respond to the signals in each direction includes a thermionic toggle device controlling a relay adapted to change over the connection of the common equipment so as to be appropriate for the direction of transmission then prevailing. In the circuit shown a positive start impulse, assuming that the normal stop condition on the line is negative, renders a valve V1 conductive and the fall in voltage across a resistance R3 renders a rectifier MR1 conducting so that a valve V2 of the toggle pair V2, V3 is cut off, and the valve V3 conducts, thus energizing the righthand winding of the relay X/2 to move its contacts x1 x2 to the position shown in which signals from a station A over the line Lla pass to the repeater R, preferably of electronic type, and over contacts x2 to the line L2b leading to the receiver of a second station B. During signalling, positive and negative impulses reach the grid of the valve V1, but will be without effect on the valve pair V2, V3 on account of the rectifier MR1. When signalling is to start from the transmitter at station B, the positive start impulse of a code signal combination on the line L1b makes V4 conducting and the fall in potential across the anode resistance R11 acts via rectifier MR2 to cut off the valve V3 so that valve V2 conducts and the current through the left-hand X winding of the relay - which reverses contacts 2 xl, x2 and signals from the line L1b pass through the repeater R and via contacts xl in its opposite position to the conductor L2a leading to the receiver of station A.
GB2953151A 1951-12-17 1951-12-17 Improvements in and relating to electrical switching arrangements suitable for use in electric telegraph systems Expired GB729439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2953151A GB729439A (en) 1951-12-17 1951-12-17 Improvements in and relating to electrical switching arrangements suitable for use in electric telegraph systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2953151A GB729439A (en) 1951-12-17 1951-12-17 Improvements in and relating to electrical switching arrangements suitable for use in electric telegraph systems

Publications (1)

Publication Number Publication Date
GB729439A true GB729439A (en) 1955-05-04

Family

ID=10293004

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2953151A Expired GB729439A (en) 1951-12-17 1951-12-17 Improvements in and relating to electrical switching arrangements suitable for use in electric telegraph systems

Country Status (1)

Country Link
GB (1) GB729439A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176079A (en) * 1985-05-23 1986-12-10 David James Reginald Martin Direction-adaptive repeaters for guided radio systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176079A (en) * 1985-05-23 1986-12-10 David James Reginald Martin Direction-adaptive repeaters for guided radio systems
GB2176079B (en) * 1985-05-23 1989-03-08 David James Reginald Martin Direction-adaptive repeater for guided radio systems

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