JPS5484909A - Signal detection system - Google Patents

Signal detection system

Info

Publication number
JPS5484909A
JPS5484909A JP14886077A JP14886077A JPS5484909A JP S5484909 A JPS5484909 A JP S5484909A JP 14886077 A JP14886077 A JP 14886077A JP 14886077 A JP14886077 A JP 14886077A JP S5484909 A JPS5484909 A JP S5484909A
Authority
JP
Japan
Prior art keywords
main line
loop
ringing
signal
detection
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
JP14886077A
Other languages
English (en)
Japanese (ja)
Other versions
JPS573273B2 (enrdf_load_stackoverflow
Inventor
Mitsutoshi Ayano
Eiji Minamitani
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP14886077A priority Critical patent/JPS5484909A/ja
Publication of JPS5484909A publication Critical patent/JPS5484909A/ja
Publication of JPS573273B2 publication Critical patent/JPS573273B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/02—Calling substations, e.g. by ringing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)
JP14886077A 1977-12-13 1977-12-13 Signal detection system Granted JPS5484909A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14886077A JPS5484909A (en) 1977-12-13 1977-12-13 Signal detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14886077A JPS5484909A (en) 1977-12-13 1977-12-13 Signal detection system

Publications (2)

Publication Number Publication Date
JPS5484909A true JPS5484909A (en) 1979-07-06
JPS573273B2 JPS573273B2 (enrdf_load_stackoverflow) 1982-01-20

Family

ID=15462351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14886077A Granted JPS5484909A (en) 1977-12-13 1977-12-13 Signal detection system

Country Status (1)

Country Link
JP (1) JPS5484909A (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59120034U (ja) * 1983-02-02 1984-08-13 株式会社小松製作所 ブランク材供給装置
JPS61150394U (enrdf_load_stackoverflow) * 1985-03-08 1986-09-17
JPS61155889U (enrdf_load_stackoverflow) * 1985-03-18 1986-09-27

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52130221A (en) * 1976-04-24 1977-11-01 Fujitsu Ltd Ringing detection circuit in telephone exchanger

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52130221A (en) * 1976-04-24 1977-11-01 Fujitsu Ltd Ringing detection circuit in telephone exchanger

Also Published As

Publication number Publication date
JPS573273B2 (enrdf_load_stackoverflow) 1982-01-20

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