CA1216690A - Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage - Google Patents

Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage

Info

Publication number
CA1216690A
CA1216690A CA000463919A CA463919A CA1216690A CA 1216690 A CA1216690 A CA 1216690A CA 000463919 A CA000463919 A CA 000463919A CA 463919 A CA463919 A CA 463919A CA 1216690 A CA1216690 A CA 1216690A
Authority
CA
Canada
Prior art keywords
receiver
tone
dtmf
signal
input terminals
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
CA000463919A
Other languages
English (en)
Inventor
Johann D. Ramsaran
Bora Biray
Nadir Nizamuddin
Anthony Yung
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Priority to CA000463919A priority Critical patent/CA1216690A/fr
Application granted granted Critical
Publication of CA1216690A publication Critical patent/CA1216690A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/46—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using signals other than revertive impulses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/005—Interface circuits for subscriber lines
    • 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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
CA000463919A 1984-09-25 1984-09-25 Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage Expired CA1216690A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA000463919A CA1216690A (fr) 1984-09-25 1984-09-25 Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000463919A CA1216690A (fr) 1984-09-25 1984-09-25 Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage

Publications (1)

Publication Number Publication Date
CA1216690A true CA1216690A (fr) 1987-01-13

Family

ID=4128772

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000463919A Expired CA1216690A (fr) 1984-09-25 1984-09-25 Circuit de ligne telephonique a recepteurs dtmf utilises en temps partage

Country Status (1)

Country Link
CA (1) CA1216690A (fr)

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Legal Events

Date Code Title Description
MKEX Expiry