GB230085A - - Google Patents

Info

Publication number
GB230085A
GB230085A GB5456/25A GB545625A GB230085A GB 230085 A GB230085 A GB 230085A GB 5456/25 A GB5456/25 A GB 5456/25A GB 545625 A GB545625 A GB 545625A GB 230085 A GB230085 A GB 230085A
Authority
GB
United Kingdom
Prior art keywords
phantom
circuits
telegraphy
telephony
circuit
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
GB5456/25A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB230085A publication Critical patent/GB230085A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/12—Arrangements for exhibiting specific transmission characteristics
    • H01B11/16—Cables, e.g. submarine cables, with coils or other devices incorporated during cable manufacture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Communication Cables (AREA)

Abstract

230,085. British Thomson-Houston Co., Ltd., (Assignees of Allgemeine Elektricitats-Ges., and Sattelberg, O.). Feb. 29, 1924, [Convention date]. Simultaneous telegraphy and telephony; phantom-circuit systems.-In a four-wire cable wound according to the known " spiral quad " formation in which all four conductors are directly twisted together, the physical circuits are employed for telephony and the phantom circuit with little or no added load is utilized for telegraphy and signalling or calling purposes. The necessity of accurately balancing the circuits is avoided by employing different ranges of frequency for the different purposes. In the system shown, telephone sets 5, 6 provided with chokes 7, 8 which block the lower frequencies serve for telephony over the pairs 1, 2; 3, 4; an instrument 14 fitted with a filter 13 passing only the lowest frequencies provides direct-current telegraphy over the phantom circuit; whilst duplex harmonic telegraphy also over the phantom circuit is available by means of instruments 16, 17 associated with a band filter 15 covering a range of frequencies lying between those passed by the devices 13, 7. Further telegraph circuits may be obtained by combining two phantom circuits of the first order to form a phantom of the second order and so on. Telephonic amplifiers in the side circuits may be by-passed by the provision of differential coils having their mid-points directly connected together.
GB5456/25A 1924-02-29 1925-02-27 Expired GB230085A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1605469X 1924-02-29

Publications (1)

Publication Number Publication Date
GB230085A true GB230085A (en) 1926-02-25

Family

ID=7737000

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5456/25A Expired GB230085A (en) 1924-02-29 1925-02-27

Country Status (3)

Country Link
US (1) US1605469A (en)
GB (1) GB230085A (en)
NL (1) NL18105C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6812919A (en) * 1967-09-27 1969-03-31

Also Published As

Publication number Publication date
NL18105C (en)
US1605469A (en) 1926-11-02

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