GB554786A - Electrical signal transmission system - Google Patents

Electrical signal transmission system

Info

Publication number
GB554786A
GB554786A GB954042A GB954042A GB554786A GB 554786 A GB554786 A GB 554786A GB 954042 A GB954042 A GB 954042A GB 954042 A GB954042 A GB 954042A GB 554786 A GB554786 A GB 554786A
Authority
GB
United Kingdom
Prior art keywords
impulses
signalling
relay
switch
imp1
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
GB954042A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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
Priority to FR882217D priority Critical patent/FR882217A/en
Priority to CH233480D priority patent/CH233480A/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to GB954042A priority patent/GB554786A/en
Publication of GB554786A publication Critical patent/GB554786A/en
Priority to BE446464D priority patent/BE446464A/xx
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
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

554,786. Electric signalling systems. STANDARD TELEPHONES & CABLES, Ltd. (International Standard Electric Corporation). July 9, 1942, No. 9540. [Class 40 (i)] [Also in Group XXXIX] In an arrangement for signalling over a circuit which may form part of a telephone connection, synchronous impulses are created at the transmitting and receiving ends and a counting switch stepped by the impulses at the transmitting end determines the duration of transmission of continuous A.C. to the receiving end to render effective a certain number of the impulses thereat. As shown, the impulses are supplied by generators IMP1, 2 which in the case of signalling within an exchange may consist of cams mounted on a common shaft. When the generators are located in different exchanges they may be synchronized by known methods. Signalling is started by the closure of contacts St1, 2 at the two ends, whereupon IMP1 controls relay B3 and IMP2 steps the switch SS. As soon as the latter moves offnormal, A.C. preferably of .voice frequency is sent over wire X of the connection and, through a transformer T, causes a cold-cathode tube L to strike, thereby putting relay B4 under the control of B3 to repeat impulses. When the switch SS reaches a marked contact, relay B2 energizes and cuts off the A.C. to terminate the repetition of impulses.
GB954042A 1942-07-09 1942-07-09 Electrical signal transmission system Expired GB554786A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR882217D FR882217A (en) 1942-07-09 1942-05-20 Electric transmission systems
CH233480D CH233480A (en) 1942-07-09 1942-07-03 Electrical signal transmission system.
GB954042A GB554786A (en) 1942-07-09 1942-07-09 Electrical signal transmission system
BE446464D BE446464A (en) 1942-07-09 1947-06-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB954042A GB554786A (en) 1942-07-09 1942-07-09 Electrical signal transmission system

Publications (1)

Publication Number Publication Date
GB554786A true GB554786A (en) 1943-07-19

Family

ID=9873964

Family Applications (1)

Application Number Title Priority Date Filing Date
GB954042A Expired GB554786A (en) 1942-07-09 1942-07-09 Electrical signal transmission system

Country Status (4)

Country Link
BE (1) BE446464A (en)
CH (1) CH233480A (en)
FR (1) FR882217A (en)
GB (1) GB554786A (en)

Also Published As

Publication number Publication date
BE446464A (en) 1948-04-17
FR882217A (en) 1943-05-21
CH233480A (en) 1944-07-31

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