JPS54111702A - Auxiliary communication circuit for key telephone set - Google Patents

Auxiliary communication circuit for key telephone set

Info

Publication number
JPS54111702A
JPS54111702A JP1928778A JP1928778A JPS54111702A JP S54111702 A JPS54111702 A JP S54111702A JP 1928778 A JP1928778 A JP 1928778A JP 1928778 A JP1928778 A JP 1928778A JP S54111702 A JPS54111702 A JP S54111702A
Authority
JP
Japan
Prior art keywords
auxiliary communication
circuit
audio signal
data line
main unit
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
JP1928778A
Other languages
Japanese (ja)
Other versions
JPS6046917B2 (en
Inventor
Osamu Enomoto
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 JP1928778A priority Critical patent/JPS6046917B2/en
Publication of JPS54111702A publication Critical patent/JPS54111702A/en
Publication of JPS6046917B2 publication Critical patent/JPS6046917B2/en
Expired 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
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
    • H04M9/007—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line wherein the key telephone sets are star-connected to a central unit by a limited number of lines

Landscapes

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

Abstract

PURPOSE:To save the exchange circuit in the main unit and to reduce the number of pairs of line, by superimposing audio signal on the data line, separating this audio signal from the data line, and providing the transmission and reception circuit for auxiliary communication with the terminal unit. CONSTITUTION:The main unit 200 is provided witht the circuit superimposing audio signal on the data line and separating audio signal from the data line, and the terminal unit is provided with the reception circuits 210...212 for auxiliary communication. The control signal corresponding to the data signal delivered from the main unit 200 is detected, operating the transmission and reception circuit for auxiliary communication in the terminal unit with the control circuit 216. Thus, the exchanging circuit in the main unit is saved, allowing to reduce the number of pairs of line.
JP1928778A 1978-02-21 1978-02-21 Auxiliary communication circuit for button telephone equipment Expired JPS6046917B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1928778A JPS6046917B2 (en) 1978-02-21 1978-02-21 Auxiliary communication circuit for button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1928778A JPS6046917B2 (en) 1978-02-21 1978-02-21 Auxiliary communication circuit for button telephone equipment

Publications (2)

Publication Number Publication Date
JPS54111702A true JPS54111702A (en) 1979-09-01
JPS6046917B2 JPS6046917B2 (en) 1985-10-18

Family

ID=11995224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1928778A Expired JPS6046917B2 (en) 1978-02-21 1978-02-21 Auxiliary communication circuit for button telephone equipment

Country Status (1)

Country Link
JP (1) JPS6046917B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01177025U (en) * 1988-05-31 1989-12-18

Also Published As

Publication number Publication date
JPS6046917B2 (en) 1985-10-18

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