JPS5643896A - Key telephone control circuit - Google Patents

Key telephone control circuit

Info

Publication number
JPS5643896A
JPS5643896A JP12029579A JP12029579A JPS5643896A JP S5643896 A JPS5643896 A JP S5643896A JP 12029579 A JP12029579 A JP 12029579A JP 12029579 A JP12029579 A JP 12029579A JP S5643896 A JPS5643896 A JP S5643896A
Authority
JP
Japan
Prior art keywords
circuit
key telephone
lamp information
data
constitution
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
JP12029579A
Other languages
Japanese (ja)
Other versions
JPS645518B2 (en
Inventor
Yuichi Goto
Kunio Nagashima
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
Original Assignee
NEC 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 Electric Co Ltd filed Critical NEC Corp
Priority to JP12029579A priority Critical patent/JPS5643896A/en
Publication of JPS5643896A publication Critical patent/JPS5643896A/en
Publication of JPS645518B2 publication Critical patent/JPS645518B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To simplify the constitution of hardware by employing DMA system for transmission and reception of button lamp information between a key telephone set and main device. CONSTITUTION:Lamp information from central processing circuit 100 is stored in desired adress of main memory circuit 116 by the memory write instruction. Central processing circuit 100, on the other hand, is applied with a DMA request signal by clock generating circuit 104 and data and address buses 101 and 300 are placed in a periodic floating state. With an address signal outputted by gate circuit 301, the lamp information is read out and transferred to data distributing circuit 109. Button information is transferred from data editing circuit 113 to memory circuit 116.
JP12029579A 1979-09-18 1979-09-18 Key telephone control circuit Granted JPS5643896A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12029579A JPS5643896A (en) 1979-09-18 1979-09-18 Key telephone control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12029579A JPS5643896A (en) 1979-09-18 1979-09-18 Key telephone control circuit

Publications (2)

Publication Number Publication Date
JPS5643896A true JPS5643896A (en) 1981-04-22
JPS645518B2 JPS645518B2 (en) 1989-01-31

Family

ID=14782694

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12029579A Granted JPS5643896A (en) 1979-09-18 1979-09-18 Key telephone control circuit

Country Status (1)

Country Link
JP (1) JPS5643896A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58188990A (en) * 1982-04-28 1983-11-04 Iwatsu Electric Co Ltd Control system of key telephone system
US4559417A (en) * 1982-09-18 1985-12-17 Tokyo Shibaura Denki Kabushiki Kaisha Method of setting operating data in a key telephone system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58188990A (en) * 1982-04-28 1983-11-04 Iwatsu Electric Co Ltd Control system of key telephone system
JPH0347638B2 (en) * 1982-04-28 1991-07-19 Iwatsu Electric Co Ltd
US4559417A (en) * 1982-09-18 1985-12-17 Tokyo Shibaura Denki Kabushiki Kaisha Method of setting operating data in a key telephone system

Also Published As

Publication number Publication date
JPS645518B2 (en) 1989-01-31

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