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FR750664A - Improvements to call converters for telecommunication lines - Google Patents

Improvements to call converters for telecommunication lines

Info

Publication number
FR750664A
FR750664A FR750664DA FR750664A FR 750664 A FR750664 A FR 750664A FR 750664D A FR750664D A FR 750664DA FR 750664 A FR750664 A FR 750664A
Authority
FR
France
Prior art keywords
converters
call
telecommunication lines
telecommunication
lines
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT SA
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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Application granted granted Critical
Publication of FR750664A publication Critical patent/FR750664A/en
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
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR750664D 1932-05-10 1932-05-10 Improvements to call converters for telecommunication lines Expired FR750664A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR750664T 1932-05-10

Publications (1)

Publication Number Publication Date
FR750664A true FR750664A (en) 1933-08-16

Family

ID=9152029

Family Applications (1)

Application Number Title Priority Date Filing Date
FR750664D Expired FR750664A (en) 1932-05-10 1932-05-10 Improvements to call converters for telecommunication lines

Country Status (1)

Country Link
FR (1) FR750664A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742805C (en) * 1936-01-16 1943-12-13 Applic Telephoniques Soc D Device for receiving and forwarding the call signals in telephone lines with intermediate amplifier stations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742805C (en) * 1936-01-16 1943-12-13 Applic Telephoniques Soc D Device for receiving and forwarding the call signals in telephone lines with intermediate amplifier stations

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