BE622438A - - Google Patents

Info

Publication number
BE622438A
BE622438A BE622438DA BE622438A BE 622438 A BE622438 A BE 622438A BE 622438D A BE622438D A BE 622438DA BE 622438 A BE622438 A BE 622438A
Authority
BE
Belgium
Application number
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.)
Publication of BE622438A publication Critical patent/BE622438A/xx

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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • 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
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
BE622438D 1961-09-15 BE622438A (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL269292 1961-09-15

Publications (1)

Publication Number Publication Date
BE622438A true BE622438A (ja)

Family

ID=19753285

Family Applications (1)

Application Number Title Priority Date Filing Date
BE622438D BE622438A (ja) 1961-09-15

Country Status (5)

Country Link
BE (1) BE622438A (ja)
CH (1) CH395205A (ja)
DE (1) DE1159041B (ja)
GB (1) GB984580A (ja)
NL (1) NL269292A (ja)

Also Published As

Publication number Publication date
GB984580A (en) 1965-02-24
NL269292A (ja)
CH395205A (de) 1965-07-15
DE1159041B (de) 1963-12-12

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