FR2554658B1 - METHOD FOR DETECTING ALTERNATIVE SIGNALS TRANSMITTED ON TELEPHONE LINES - Google Patents

METHOD FOR DETECTING ALTERNATIVE SIGNALS TRANSMITTED ON TELEPHONE LINES

Info

Publication number
FR2554658B1
FR2554658B1 FR8318076A FR8318076A FR2554658B1 FR 2554658 B1 FR2554658 B1 FR 2554658B1 FR 8318076 A FR8318076 A FR 8318076A FR 8318076 A FR8318076 A FR 8318076A FR 2554658 B1 FR2554658 B1 FR 2554658B1
Authority
FR
France
Prior art keywords
signals transmitted
telephone lines
alternative signals
detecting alternative
detecting
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
FR8318076A
Other languages
French (fr)
Other versions
FR2554658A1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR8318076A priority Critical patent/FR2554658B1/en
Publication of FR2554658A1 publication Critical patent/FR2554658A1/en
Application granted granted Critical
Publication of FR2554658B1 publication Critical patent/FR2554658B1/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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
FR8318076A 1983-11-09 1983-11-09 METHOD FOR DETECTING ALTERNATIVE SIGNALS TRANSMITTED ON TELEPHONE LINES Expired FR2554658B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8318076A FR2554658B1 (en) 1983-11-09 1983-11-09 METHOD FOR DETECTING ALTERNATIVE SIGNALS TRANSMITTED ON TELEPHONE LINES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8318076A FR2554658B1 (en) 1983-11-09 1983-11-09 METHOD FOR DETECTING ALTERNATIVE SIGNALS TRANSMITTED ON TELEPHONE LINES

Publications (2)

Publication Number Publication Date
FR2554658A1 FR2554658A1 (en) 1985-05-10
FR2554658B1 true FR2554658B1 (en) 1986-09-05

Family

ID=9294091

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8318076A Expired FR2554658B1 (en) 1983-11-09 1983-11-09 METHOD FOR DETECTING ALTERNATIVE SIGNALS TRANSMITTED ON TELEPHONE LINES

Country Status (1)

Country Link
FR (1) FR2554658B1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1518956A (en) * 1967-02-02 1968-03-29 Ibm France Receiver of information transmitted in the form of frequency combinations
DE2201166A1 (en) * 1972-01-11 1973-07-12 Standard Elektrik Lorenz Ag CIRCUIT ARRANGEMENT FOR A SELECTIVE SIGNAL RECEIVER
FR2391622A1 (en) * 1977-05-18 1978-12-15 Materiel Telephonique Multifrequency signalling system with logic circuit - controls function of line coupling and master unit
DE2925572A1 (en) * 1979-06-25 1981-01-08 Elmeg Telephone local exchange using multifrequency selection - has central selector responding to signal combination representing number to supply switching control signal
JPS56131245A (en) * 1980-03-19 1981-10-14 Hitachi Ltd Signal detecting circuit
US4467277A (en) * 1982-02-04 1984-08-21 E-Systems, Inc. Programmable detector for tone signals

Also Published As

Publication number Publication date
FR2554658A1 (en) 1985-05-10

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Legal Events

Date Code Title Description
ST Notification of lapse