FR1076687A - Telephone call signal transfer device - Google Patents

Telephone call signal transfer device

Info

Publication number
FR1076687A
FR1076687A FR1076687DA FR1076687A FR 1076687 A FR1076687 A FR 1076687A FR 1076687D A FR1076687D A FR 1076687DA FR 1076687 A FR1076687 A FR 1076687A
Authority
FR
France
Prior art keywords
transfer device
telephone call
call signal
signal transfer
telephone
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
Other languages
French (fr)
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR1076687A publication Critical patent/FR1076687A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements
    • H04M1/715—Substation extension arrangements using two or more extensions per line
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR1076687D 1952-05-05 1953-05-05 Telephone call signal transfer device Expired FR1076687A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
FR1076687A true FR1076687A (en) 1954-10-28

Family

ID=20307662

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1076687D Expired FR1076687A (en) 1952-05-05 1953-05-05 Telephone call signal transfer device

Country Status (4)

Country Link
BE (1) BE519670A (en)
CH (1) CH313062A (en)
FR (1) FR1076687A (en)
NL (2) NL178068B (en)

Also Published As

Publication number Publication date
BE519670A (en)
NL83319C (en)
CH313062A (en) 1956-03-15
NL178068B (en)

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