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GB556326A - Improvements in electrical signalling systems - Google Patents

Improvements in electrical signalling systems

Info

Publication number
GB556326A
GB556326A GB76443A GB76443A GB556326A GB 556326 A GB556326 A GB 556326A GB 76443 A GB76443 A GB 76443A GB 76443 A GB76443 A GB 76443A GB 556326 A GB556326 A GB 556326A
Authority
GB
United Kingdom
Prior art keywords
tube
line
anode circuit
grid
signalling systems
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
GB76443A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB76443A priority Critical patent/GB556326A/en
Publication of GB556326A publication Critical patent/GB556326A/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
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of DC pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

556,326. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., TAYLOR, R., and BAKER, G. T. March 26, 1942, No. 764/43. Divided out of 551,187. [Class 40 (iv)] [Also in Group XL] Direct current impulses received over a long line are applied inductively to the grid of a gas-discharge tube so that a relav energizes in the anode circuit at each impulse break and connects up an operating magnet which opens the anode circuit and extinguishes the tube. The invention is applied to a system for " demand " " working, Figs. 1, 2 (not shown), which is identical with that disclosed in Specification 551,187. In a modified arrangement, Fig. 3, for guarding against false operation by transient surges in the line, the voltage induced in the third winding of line relay A serves to charge a condenser QG through a high resistance YJ so that an appreciable time elapses before the grid potential of the tube GDT3 is sufficient for ionization. Specifications 458,095 and 549,047 are referred to.
GB76443A 1942-03-26 1942-03-26 Improvements in electrical signalling systems Expired GB556326A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB76443A GB556326A (en) 1942-03-26 1942-03-26 Improvements in electrical signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB76443A GB556326A (en) 1942-03-26 1942-03-26 Improvements in electrical signalling systems

Publications (1)

Publication Number Publication Date
GB556326A true GB556326A (en) 1943-09-29

Family

ID=9710112

Family Applications (1)

Application Number Title Priority Date Filing Date
GB76443A Expired GB556326A (en) 1942-03-26 1942-03-26 Improvements in electrical signalling systems

Country Status (1)

Country Link
GB (1) GB556326A (en)

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