JPS56122592A - Scanning system - Google Patents

Scanning system

Info

Publication number
JPS56122592A
JPS56122592A JP2633280A JP2633280A JPS56122592A JP S56122592 A JPS56122592 A JP S56122592A JP 2633280 A JP2633280 A JP 2633280A JP 2633280 A JP2633280 A JP 2633280A JP S56122592 A JPS56122592 A JP S56122592A
Authority
JP
Japan
Prior art keywords
line
monitor
filters
points
appears
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.)
Pending
Application number
JP2633280A
Other languages
Japanese (ja)
Inventor
Susumu Enokido
Toru Ueda
Jun Matsuda
Eiji Takemori
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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon Electric Co 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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2633280A priority Critical patent/JPS56122592A/en
Publication of JPS56122592A publication Critical patent/JPS56122592A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/72—Finding out and indicating number of calling subscriber

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To miniature a scanning device which has lines of a telephone switchboard and monitor points for every line, by decreasing the number of filters by processing previous information between the assignment of a line and the collection of information on monitor points. CONSTITUTION:When driving line ROW0 is assigned and changes in state at monitor points a00-a0m of the line are to be detected, a positive pulse appears like driving ROW0 once the line is assigned. The pulse appears at filters FIL0-FILm provided corresponding to the monitor points. Through the filters, time limitation for noise absorption in carried out and their outputs appear at sense amplifiers SA0-SAm, but, for example, when monitor point a00 is in operation, the positive pulse flows to the ground and appears at neither filter FIL0 nor sense amplifier SA0, so that sense amplifier SA0 will detect monitor point a00 being in operation. Thus, filters are only provided as many as sense amplifiers because monitor information read between line assignment and detecting-reading operation is processed.
JP2633280A 1980-03-03 1980-03-03 Scanning system Pending JPS56122592A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2633280A JPS56122592A (en) 1980-03-03 1980-03-03 Scanning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2633280A JPS56122592A (en) 1980-03-03 1980-03-03 Scanning system

Publications (1)

Publication Number Publication Date
JPS56122592A true JPS56122592A (en) 1981-09-26

Family

ID=12190463

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2633280A Pending JPS56122592A (en) 1980-03-03 1980-03-03 Scanning system

Country Status (1)

Country Link
JP (1) JPS56122592A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5345908A (en) * 1976-10-07 1978-04-25 Fujitsu Ltd Subscriber scanning system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5345908A (en) * 1976-10-07 1978-04-25 Fujitsu Ltd Subscriber scanning system

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