KR910003557U - 50HZ tone signal detection circuit of private exchange - Google Patents

50HZ tone signal detection circuit of private exchange

Info

Publication number
KR910003557U
KR910003557U KR2019890011283U KR890011283U KR910003557U KR 910003557 U KR910003557 U KR 910003557U KR 2019890011283 U KR2019890011283 U KR 2019890011283U KR 890011283 U KR890011283 U KR 890011283U KR 910003557 U KR910003557 U KR 910003557U
Authority
KR
South Korea
Prior art keywords
detection circuit
signal detection
tone signal
private exchange
private
Prior art date
Application number
KR2019890011283U
Other languages
Korean (ko)
Other versions
KR940007119Y1 (en
Inventor
김대성
한성룡
Original Assignee
금성정보통신 주식회사
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 금성정보통신 주식회사 filed Critical 금성정보통신 주식회사
Priority to KR2019890011283U priority Critical patent/KR940007119Y1/en
Publication of KR910003557U publication Critical patent/KR910003557U/en
Application granted granted Critical
Publication of KR940007119Y1 publication Critical patent/KR940007119Y1/en

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/20—Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/02—Diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/04—Transistors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/05—Aspects of automatic or semi-automatic exchanges related to OAM&P

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
KR2019890011283U 1989-07-31 1989-07-31 Tone signal detecting circuit KR940007119Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019890011283U KR940007119Y1 (en) 1989-07-31 1989-07-31 Tone signal detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019890011283U KR940007119Y1 (en) 1989-07-31 1989-07-31 Tone signal detecting circuit

Publications (2)

Publication Number Publication Date
KR910003557U true KR910003557U (en) 1991-02-27
KR940007119Y1 KR940007119Y1 (en) 1994-10-13

Family

ID=19288774

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019890011283U KR940007119Y1 (en) 1989-07-31 1989-07-31 Tone signal detecting circuit

Country Status (1)

Country Link
KR (1) KR940007119Y1 (en)

Also Published As

Publication number Publication date
KR940007119Y1 (en) 1994-10-13

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Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
REGI Registration of establishment
FPAY Annual fee payment

Payment date: 19970213

Year of fee payment: 6

LAPS Lapse due to unpaid annual fee