BE519670A - - Google Patents

Info

Publication number
BE519670A
BE519670A BE519670DA BE519670A BE 519670 A BE519670 A BE 519670A BE 519670D A BE519670D A BE 519670DA BE 519670 A BE519670 A BE 519670A
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 BE519670A publication Critical patent/BE519670A/xx

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/08Indicating faults in circuits or apparatus
    • H04M3/12Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/71Substation extension arrangements
    • H04M1/715Substation extension arrangements using two or more extensions per line
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M19/00Current supply arrangements for telephone systems
    • H04M19/02Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04Current 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
BE519670D 1952-05-05 BE519670A (en:Method)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE313062X 1952-05-05

Publications (1)

Publication Number Publication Date
BE519670A true BE519670A (en:Method)

Family

ID=20307662

Family Applications (1)

Application Number Title Priority Date Filing Date
BE519670D BE519670A (en:Method) 1952-05-05

Country Status (4)

Country Link
BE (1) BE519670A (en:Method)
CH (1) CH313062A (en:Method)
FR (1) FR1076687A (en:Method)
NL (2) NL83319C (en:Method)

Also Published As

Publication number Publication date
NL178068B (nl)
FR1076687A (fr) 1954-10-28
CH313062A (de) 1956-03-15
NL83319C (en:Method)

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