JPS5437409A - Push-button dial signal system - Google Patents

Push-button dial signal system

Info

Publication number
JPS5437409A
JPS5437409A JP10261577A JP10261577A JPS5437409A JP S5437409 A JPS5437409 A JP S5437409A JP 10261577 A JP10261577 A JP 10261577A JP 10261577 A JP10261577 A JP 10261577A JP S5437409 A JPS5437409 A JP S5437409A
Authority
JP
Japan
Prior art keywords
push
dial signal
signal system
button dial
signal
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.)
Pending
Application number
JP10261577A
Other languages
Japanese (ja)
Inventor
Tadao Fujimura
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu Electric Co 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP10261577A priority Critical patent/JPS5437409A/en
Publication of JPS5437409A publication Critical patent/JPS5437409A/en
Pending 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)

Abstract

PURPOSE:To secure an assured prevention for the malfunction of the PB signal receiver caused by the aural false signal, by providing the current limiting element and receiving the multi-frequency dial signal through detection of the error of the DC loop resistance.
JP10261577A 1977-08-29 1977-08-29 Push-button dial signal system Pending JPS5437409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10261577A JPS5437409A (en) 1977-08-29 1977-08-29 Push-button dial signal system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10261577A JPS5437409A (en) 1977-08-29 1977-08-29 Push-button dial signal system

Publications (1)

Publication Number Publication Date
JPS5437409A true JPS5437409A (en) 1979-03-19

Family

ID=14332141

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10261577A Pending JPS5437409A (en) 1977-08-29 1977-08-29 Push-button dial signal system

Country Status (1)

Country Link
JP (1) JPS5437409A (en)

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