GB362452A - Improvements in duplex telegraphy - Google Patents

Improvements in duplex telegraphy

Info

Publication number
GB362452A
GB362452A GB2639430A GB2639430A GB362452A GB 362452 A GB362452 A GB 362452A GB 2639430 A GB2639430 A GB 2639430A GB 2639430 A GB2639430 A GB 2639430A GB 362452 A GB362452 A GB 362452A
Authority
GB
United Kingdom
Prior art keywords
transmitter
switch
apex
duplex
during idle
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
GB2639430A
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.)
Creed and Co Ltd
Original Assignee
Creed and Co 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 Creed and Co Ltd filed Critical Creed and Co Ltd
Priority to GB2639430A priority Critical patent/GB362452A/en
Priority to FR702328D priority patent/FR702328A/en
Publication of GB362452A publication Critical patent/GB362452A/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
    • H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals
    • 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

Abstract

362,452. Duplex telegraphy. CREED & CO., Ltd. and GRIFFITH, R. G., Telegraph Works, Croydon, Surrey. Sept. 4, 1930, No. 26394. [Class 40 (iii).] In double - current duplex telegraph systems, particularly those of the start-stop type, waste of current is avoided by the use of a sound-reciever switch 2 operated, for instance, by a cam on the usual cam sleeve of a start-stop transmitter. This switch disconnects the apex A of the bridge from the transmitter B during idle periods, and connects it to earth through a resistance E which prevents disturbance of the balance. In a modification, Figs. 3 and 4 (not shown), the apex A is permanently earthed through the armature of a generator whose field circuit is fed by the transmitter or, during idle periods, is short-circuited by the send-receiver switch 2.
GB2639430A 1930-09-04 1930-09-04 Improvements in duplex telegraphy Expired GB362452A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2639430A GB362452A (en) 1930-09-04 1930-09-04 Improvements in duplex telegraphy
FR702328D FR702328A (en) 1930-09-04 1930-09-17 Improvements to duplex telegraph installations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2639430A GB362452A (en) 1930-09-04 1930-09-04 Improvements in duplex telegraphy

Publications (1)

Publication Number Publication Date
GB362452A true GB362452A (en) 1931-12-04

Family

ID=10242946

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2639430A Expired GB362452A (en) 1930-09-04 1930-09-04 Improvements in duplex telegraphy

Country Status (2)

Country Link
FR (1) FR702328A (en)
GB (1) GB362452A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2310668A1 (en) * 1975-05-06 1976-12-03 Desieter Rene Teleprinter translator with relay circuit - uuses relay circuit to allow use of remote terminal without earth point and has connections to mid point of batteries
EP0570322A1 (en) * 1992-05-15 1993-11-18 International Business Machines Corporation Power-saving, full duplex nodal communications systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2310668A1 (en) * 1975-05-06 1976-12-03 Desieter Rene Teleprinter translator with relay circuit - uuses relay circuit to allow use of remote terminal without earth point and has connections to mid point of batteries
EP0570322A1 (en) * 1992-05-15 1993-11-18 International Business Machines Corporation Power-saving, full duplex nodal communications systems

Also Published As

Publication number Publication date
FR702328A (en) 1931-04-03

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