GB505506A - Improvements in automatic telephone systems - Google Patents

Improvements in automatic telephone systems

Info

Publication number
GB505506A
GB505506A GB30998/37A GB3099837A GB505506A GB 505506 A GB505506 A GB 505506A GB 30998/37 A GB30998/37 A GB 30998/37A GB 3099837 A GB3099837 A GB 3099837A GB 505506 A GB505506 A GB 505506A
Authority
GB
United Kingdom
Prior art keywords
line
paths
striking
link
voltage
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
GB30998/37A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB505506A publication Critical patent/GB505506A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C22/00—Alloys based on manganese

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

505,506. Automatic exchange systems. TELEFONAKTIEBOLAGET L. M. ERICSSON. Nov. 11, 1937, No. 30998. Convention date, Nov. 14, 1936. [Class 40 (iv)] A switching arrangement comprises a number of pairs of electronic or other discharge paths U1, U2 connected in multiple to subscribers' lines AL and giving access to links FL which are also multipled to the discharge paths. According to the invention, line AL and link FL are connected over resistances rl, r2, r5, r6 to batteries E1, E2 of different voltages, the difference E1-E2 being less than the striking voltage of the paths. When subscriber A1 calls, the voltage dropped over resistances r1, r2 causes the paths to strike and busies the line, the link being busied by the voltage drop over r5, r6. Resistances shunted by condensers similar to those shown may be connected between points 5, 6 and subscribers' line to adjust the line resistance. In order to ensure that only a corresponding pair of paths shall strike, the striking voltages for different pairs may be graded, or the striking of one path U1 may bring about the striking of the other path U2. Numerical selection of a subscriber's line may be effected by application of marking potential over ML to grid electrodes with or without a change of voltage applied to the link. The line may be rung in the ordinary way or by causing the discharge tubes to oscillate.
GB30998/37A 1936-11-14 1937-11-11 Improvements in automatic telephone systems Expired GB505506A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE505506X 1936-11-14

Publications (1)

Publication Number Publication Date
GB505506A true GB505506A (en) 1939-05-11

Family

ID=20310830

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30998/37A Expired GB505506A (en) 1936-11-14 1937-11-11 Improvements in automatic telephone systems

Country Status (3)

Country Link
BE (1) BE505506A (en)
FR (1) FR828935A (en)
GB (1) GB505506A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969953C (en) * 1952-02-13 1958-08-07 Int Standard Electric Corp Circuit arrangement for fully electronic telecommunications, especially telephone switching equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969953C (en) * 1952-02-13 1958-08-07 Int Standard Electric Corp Circuit arrangement for fully electronic telecommunications, especially telephone switching equipment

Also Published As

Publication number Publication date
FR828935A (en) 1938-06-03
BE505506A (en)

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