JPS53138207A - Calling detection circuit - Google Patents

Calling detection circuit

Info

Publication number
JPS53138207A
JPS53138207A JP5204977A JP5204977A JPS53138207A JP S53138207 A JPS53138207 A JP S53138207A JP 5204977 A JP5204977 A JP 5204977A JP 5204977 A JP5204977 A JP 5204977A JP S53138207 A JPS53138207 A JP S53138207A
Authority
JP
Japan
Prior art keywords
detection circuit
calling detection
circuit
calling
economize
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
JP5204977A
Other languages
Japanese (ja)
Other versions
JPS5641037B2 (en
Inventor
Tetsuo Takeshita
Naohiko Yasui
Akira Kikuchi
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.)
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP5204977A priority Critical patent/JPS53138207A/en
Publication of JPS53138207A publication Critical patent/JPS53138207A/en
Publication of JPS5641037B2 publication Critical patent/JPS5641037B2/ja
Granted 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
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To economize a circuit with power consumption reduced by obtaining the electronic circuit by inserting a switching circuit, which uses a semiconductor, into a channel.
JP5204977A 1977-05-09 1977-05-09 Calling detection circuit Granted JPS53138207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5204977A JPS53138207A (en) 1977-05-09 1977-05-09 Calling detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5204977A JPS53138207A (en) 1977-05-09 1977-05-09 Calling detection circuit

Publications (2)

Publication Number Publication Date
JPS53138207A true JPS53138207A (en) 1978-12-02
JPS5641037B2 JPS5641037B2 (en) 1981-09-25

Family

ID=12903949

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5204977A Granted JPS53138207A (en) 1977-05-09 1977-05-09 Calling detection circuit

Country Status (1)

Country Link
JP (1) JPS53138207A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49129408U (en) * 1973-03-05 1974-11-07
JPS5195709A (en) * 1975-02-19 1976-08-21
JPS51127605A (en) * 1975-04-30 1976-11-06 Hitachi Ltd Call detection system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49129408U (en) * 1973-03-05 1974-11-07
JPS5195709A (en) * 1975-02-19 1976-08-21
JPS51127605A (en) * 1975-04-30 1976-11-06 Hitachi Ltd Call detection system

Also Published As

Publication number Publication date
JPS5641037B2 (en) 1981-09-25

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