GB551092A - Improvements relating to electric signalling systems - Google Patents

Improvements relating to electric signalling systems

Info

Publication number
GB551092A
GB551092A GB1320641A GB1320641A GB551092A GB 551092 A GB551092 A GB 551092A GB 1320641 A GB1320641 A GB 1320641A GB 1320641 A GB1320641 A GB 1320641A GB 551092 A GB551092 A GB 551092A
Authority
GB
United Kingdom
Prior art keywords
relay
dml
operates
falls back
dma
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
GB1320641A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers 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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB1320641A priority Critical patent/GB551092A/en
Publication of GB551092A publication Critical patent/GB551092A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Relay Circuits (AREA)

Abstract

551,092. Selective signalling. SIEMENS BROS., & CO., Ltd., and DURKIN, E. W Oct. 14, 1941, No. 13206. [Class 40 (i)] [Also in Group XXXIX] In a direct current signalling system, the insertion of a rectifier in the line circuit at the sending end causes the release of a relay at the receiving end, whereupon a further relay controlled thereby operates to annul the signal by reversing the connections of the line relay. The Figure shows an arrangement for obtaining synchronous operation of two switches DML, DMA, the line circuit including opposed rectifiers MRA, MRB which are brought in alternately by relay S. In the position shown, relays T, A are up while S, R are back. If the marking is transferred to a later contact of DML, T falls back, S operates, A falls back and DMA steps. Reversing relay R now energizes, A re-operates in series with L and DML steps, whereupon S falls back and the action is repeated until the change-over of S is prevented by the operation of T. Other applications are concerned with automatic telephone exchange systems (see Group XXXIX).
GB1320641A 1941-10-14 1941-10-14 Improvements relating to electric signalling systems Expired GB551092A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1320641A GB551092A (en) 1941-10-14 1941-10-14 Improvements relating to electric signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1320641A GB551092A (en) 1941-10-14 1941-10-14 Improvements relating to electric signalling systems

Publications (1)

Publication Number Publication Date
GB551092A true GB551092A (en) 1943-02-08

Family

ID=10018760

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1320641A Expired GB551092A (en) 1941-10-14 1941-10-14 Improvements relating to electric signalling systems

Country Status (1)

Country Link
GB (1) GB551092A (en)

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