GB783637A - Improvements in or relating to circuit arrangements for keyboard-controlled signalling of digital information in telecommunication systems - Google Patents

Improvements in or relating to circuit arrangements for keyboard-controlled signalling of digital information in telecommunication systems

Info

Publication number
GB783637A
GB783637A GB9984/55A GB998455A GB783637A GB 783637 A GB783637 A GB 783637A GB 9984/55 A GB9984/55 A GB 9984/55A GB 998455 A GB998455 A GB 998455A GB 783637 A GB783637 A GB 783637A
Authority
GB
United Kingdom
Prior art keywords
relays
keyboard
relating
digital information
telecommunication 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
GB9984/55A
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 and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB783637A publication Critical patent/GB783637A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

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

Abstract

783,637. Automatic exchange equipment. SIEMENS & HALSKE AKT.-GES. April 5, 1955 [April 5, 1954], No. 9984/55. Drawings to Specification. Class 40 (4). A subscriber's number sending device comprises a keyboard which inserts into the loop either a resistance, or a rectifier, or a combination of both, in respect of each digit to be signalled, and direct current is passed sequentially in the two directions round the loop, the current in the two cases controlling the operation of marginal differential relays at the exchange, each relay having one winding traversed by these currents, and another subjected to a constant current in a local circuit. The relays so operated in each case cause the operation of corresponding relays of two further sets of relays, respectively, and a circuit is completed over contacts of these further relays to a lead indicative of the value of the digit signalled.
GB9984/55A 1954-04-05 1955-04-05 Improvements in or relating to circuit arrangements for keyboard-controlled signalling of digital information in telecommunication systems Expired GB783637A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE331074X 1954-04-05

Publications (1)

Publication Number Publication Date
GB783637A true GB783637A (en) 1957-09-25

Family

ID=6194540

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9984/55A Expired GB783637A (en) 1954-04-05 1955-04-05 Improvements in or relating to circuit arrangements for keyboard-controlled signalling of digital information in telecommunication systems

Country Status (4)

Country Link
BE (1) BE536547A (en)
CH (1) CH331074A (en)
FR (1) FR1137279A (en)
GB (1) GB783637A (en)

Also Published As

Publication number Publication date
CH331074A (en) 1958-06-30
BE536547A (en)
FR1137279A (en) 1957-05-27

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