JPS5452405A - Subscribersigma selective key circuit - Google Patents

Subscribersigma selective key circuit

Info

Publication number
JPS5452405A
JPS5452405A JP11885977A JP11885977A JPS5452405A JP S5452405 A JPS5452405 A JP S5452405A JP 11885977 A JP11885977 A JP 11885977A JP 11885977 A JP11885977 A JP 11885977A JP S5452405 A JPS5452405 A JP S5452405A
Authority
JP
Japan
Prior art keywords
counter
information
circuit
key
row
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
JP11885977A
Other languages
Japanese (ja)
Other versions
JPS5847900B2 (en
Inventor
Kazuhiro Sato
Nobuyuki Yasojima
Tadao Nozaki
Yasuo Satake
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 JP52118859A priority Critical patent/JPS5847900B2/en
Publication of JPS5452405A publication Critical patent/JPS5452405A/en
Publication of JPS5847900B2 publication Critical patent/JPS5847900B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To reduce the number of information lines, by transmitting column information and row information of a key matrix from an attendant switchboard to a switch board in a time-division mode. CONSTITUTION:Scanning pulses of key matrix 1 are being sent out from scanning control circuit 6 via column counter 4 and row counter 5. An operator turning ON any key, the output signal of counter 4 is decoded 2, applied as a column selective pulse to multiplexer 3 via the cross point, and returned to circuit 6 as row information. When the row information pulse is received, circuit 6 actuates transmission control circuit 9 at the same time when setting the value of counter 5 to units-digit transmission circuit 7 and the value of counter 4 to tens- digit transmission circuit 8. Consequently, the key information of matrix 1 is transmitted to the switchboard as a two-digit dial number.
JP52118859A 1977-10-03 1977-10-03 Subscriber selection key circuit Expired JPS5847900B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52118859A JPS5847900B2 (en) 1977-10-03 1977-10-03 Subscriber selection key circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52118859A JPS5847900B2 (en) 1977-10-03 1977-10-03 Subscriber selection key circuit

Publications (2)

Publication Number Publication Date
JPS5452405A true JPS5452405A (en) 1979-04-25
JPS5847900B2 JPS5847900B2 (en) 1983-10-25

Family

ID=14746894

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52118859A Expired JPS5847900B2 (en) 1977-10-03 1977-10-03 Subscriber selection key circuit

Country Status (1)

Country Link
JP (1) JPS5847900B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5871789A (en) * 1981-10-26 1983-04-28 Toshiba Corp Mode switching system of key telephone device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54506A (en) * 1977-06-03 1979-01-05 Hitachi Ltd Transfer system of key information in b board

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54506A (en) * 1977-06-03 1979-01-05 Hitachi Ltd Transfer system of key information in b board

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5871789A (en) * 1981-10-26 1983-04-28 Toshiba Corp Mode switching system of key telephone device

Also Published As

Publication number Publication date
JPS5847900B2 (en) 1983-10-25

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