JPS5347708A - Test circuit for multi-frequency signal - Google Patents

Test circuit for multi-frequency signal

Info

Publication number
JPS5347708A
JPS5347708A JP12263976A JP12263976A JPS5347708A JP S5347708 A JPS5347708 A JP S5347708A JP 12263976 A JP12263976 A JP 12263976A JP 12263976 A JP12263976 A JP 12263976A JP S5347708 A JPS5347708 A JP S5347708A
Authority
JP
Japan
Prior art keywords
frequency signal
test circuit
faaulty
secure
signals
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.)
Granted
Application number
JP12263976A
Other languages
Japanese (ja)
Other versions
JPS5725105B2 (en
Inventor
Kazunari Hirano
Akinobu Tomimori
Nobuhisa Ayugase
Masayuki Murakami
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.)
NEC Corp
NTT Inc
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon 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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12263976A priority Critical patent/JPS5347708A/en
Publication of JPS5347708A publication Critical patent/JPS5347708A/en
Publication of JPS5725105B2 publication Critical patent/JPS5725105B2/ja
Granted 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)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To secure a quick detection for the faaulty telephone set by detecting the abnormal area of the level difference for PB signals to each other.
JP12263976A 1976-10-13 1976-10-13 Test circuit for multi-frequency signal Granted JPS5347708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12263976A JPS5347708A (en) 1976-10-13 1976-10-13 Test circuit for multi-frequency signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12263976A JPS5347708A (en) 1976-10-13 1976-10-13 Test circuit for multi-frequency signal

Publications (2)

Publication Number Publication Date
JPS5347708A true JPS5347708A (en) 1978-04-28
JPS5725105B2 JPS5725105B2 (en) 1982-05-27

Family

ID=14840939

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12263976A Granted JPS5347708A (en) 1976-10-13 1976-10-13 Test circuit for multi-frequency signal

Country Status (1)

Country Link
JP (1) JPS5347708A (en)

Also Published As

Publication number Publication date
JPS5725105B2 (en) 1982-05-27

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