JPH0137896B2 - - Google Patents

Info

Publication number
JPH0137896B2
JPH0137896B2 JP8329282A JP8329282A JPH0137896B2 JP H0137896 B2 JPH0137896 B2 JP H0137896B2 JP 8329282 A JP8329282 A JP 8329282A JP 8329282 A JP8329282 A JP 8329282A JP H0137896 B2 JPH0137896 B2 JP H0137896B2
Authority
JP
Japan
Prior art keywords
telephone
photocoupler
local current
light receiving
output
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
JP8329282A
Other languages
English (en)
Japanese (ja)
Other versions
JPS58200656A (ja
Inventor
Takayuki Mashio
Ginzo Yamatani
Yutaka Nishino
Masayuki Minafuji
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.)
NTT Inc
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 JP8329282A priority Critical patent/JPS58200656A/ja
Publication of JPS58200656A publication Critical patent/JPS58200656A/ja
Publication of JPH0137896B2 publication Critical patent/JPH0137896B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Meter Arrangements (AREA)
JP8329282A 1982-05-19 1982-05-19 電話機内における局電流検出方式 Granted JPS58200656A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8329282A JPS58200656A (ja) 1982-05-19 1982-05-19 電話機内における局電流検出方式

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8329282A JPS58200656A (ja) 1982-05-19 1982-05-19 電話機内における局電流検出方式

Publications (2)

Publication Number Publication Date
JPS58200656A JPS58200656A (ja) 1983-11-22
JPH0137896B2 true JPH0137896B2 (de) 1989-08-10

Family

ID=13798314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8329282A Granted JPS58200656A (ja) 1982-05-19 1982-05-19 電話機内における局電流検出方式

Country Status (1)

Country Link
JP (1) JPS58200656A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01227554A (ja) * 1988-03-07 1989-09-11 Rohm Co Ltd 電話回線の極性反転検出装置

Also Published As

Publication number Publication date
JPS58200656A (ja) 1983-11-22

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