JPS5447408A - Busy checker - Google Patents

Busy checker

Info

Publication number
JPS5447408A
JPS5447408A JP11259677A JP11259677A JPS5447408A JP S5447408 A JPS5447408 A JP S5447408A JP 11259677 A JP11259677 A JP 11259677A JP 11259677 A JP11259677 A JP 11259677A JP S5447408 A JPS5447408 A JP S5447408A
Authority
JP
Japan
Prior art keywords
jack
series
channel circuit
earphone
plug
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
JP11259677A
Other languages
Japanese (ja)
Other versions
JPS581874B2 (en
Inventor
Masaru Murasawa
Kiyoshi Inoue
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP11259677A priority Critical patent/JPS581874B2/en
Publication of JPS5447408A publication Critical patent/JPS5447408A/en
Publication of JPS581874B2 publication Critical patent/JPS581874B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To decrease the click sound and to confirm the dial tone after release of the call stop by connecting the earphone and the cpacitor in series when the pulg is inserted into the jack and connecting the lamp to the channel circuit via push- button switch when the plug is pulled out of the jack respectively. CONSTITUTION:Push-button switch 2 is always open and connected in series to lamp 1 to be furthermore connected in parallel to the channel circuit along with the series circuit comprising jack 3 and capacitor 4. When plug 5 connected to earphone 6 is inserted to jack 3, both capacitor 4 and earphone 6 are connected in series to the channel circuit; and only lamp 1 is connected to the channel circuit with push of switch 2 when plug 5 is pulled out of jack 3. In this way, the click sound caused at the monitoring time can be decreased, and also the factor causing the error pulse and others can be eliminated. And thus the dial tone can be confirmed after release of the call stop.
JP11259677A 1977-09-21 1977-09-21 Busy checker Expired JPS581874B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11259677A JPS581874B2 (en) 1977-09-21 1977-09-21 Busy checker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11259677A JPS581874B2 (en) 1977-09-21 1977-09-21 Busy checker

Publications (2)

Publication Number Publication Date
JPS5447408A true JPS5447408A (en) 1979-04-14
JPS581874B2 JPS581874B2 (en) 1983-01-13

Family

ID=14590687

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11259677A Expired JPS581874B2 (en) 1977-09-21 1977-09-21 Busy checker

Country Status (1)

Country Link
JP (1) JPS581874B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57203351A (en) * 1981-06-10 1982-12-13 Fujitsu Ltd Circuit monitor system
JPH01181366A (en) * 1988-01-14 1989-07-19 Nippon Telegr & Teleph Corp <Ntt> Duplicate jumper verifying test method and line open plug used for said test method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6212061U (en) * 1985-07-08 1987-01-24

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57203351A (en) * 1981-06-10 1982-12-13 Fujitsu Ltd Circuit monitor system
JPH01181366A (en) * 1988-01-14 1989-07-19 Nippon Telegr & Teleph Corp <Ntt> Duplicate jumper verifying test method and line open plug used for said test method

Also Published As

Publication number Publication date
JPS581874B2 (en) 1983-01-13

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