JPS56164661A - Call auxiliary device - Google Patents

Call auxiliary device

Info

Publication number
JPS56164661A
JPS56164661A JP6736580A JP6736580A JPS56164661A JP S56164661 A JPS56164661 A JP S56164661A JP 6736580 A JP6736580 A JP 6736580A JP 6736580 A JP6736580 A JP 6736580A JP S56164661 A JPS56164661 A JP S56164661A
Authority
JP
Japan
Prior art keywords
telephone set
selection signal
supply circuit
local
common
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
JP6736580A
Other languages
Japanese (ja)
Inventor
Tadao Ishii
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 JP6736580A priority Critical patent/JPS56164661A/en
Publication of JPS56164661A publication Critical patent/JPS56164661A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To increase a call current, by connecting a local supply circuit to a telephone line via a bidirectional rectifying circuit, in a telephone set combinedly provided with the local power supply circuit. CONSTITUTION:When an 8-common trunk PLT calls out a called 8-common telephone set PT, a selection signal TR is operated and a DC voltage -V1 is fed to a channel auxiliary device AD2 at the same time. But, since a diode D1 is present, no selection signal is stopped but an alarm device SD is energized. Further, when a called 8-common telephone set PT responds, the selection signal is stopped. In a calling state, a local call current I2 is increased with a local power supply circuit for a telephone set T.
JP6736580A 1980-05-21 1980-05-21 Call auxiliary device Pending JPS56164661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6736580A JPS56164661A (en) 1980-05-21 1980-05-21 Call auxiliary device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6736580A JPS56164661A (en) 1980-05-21 1980-05-21 Call auxiliary device

Publications (1)

Publication Number Publication Date
JPS56164661A true JPS56164661A (en) 1981-12-17

Family

ID=13342906

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6736580A Pending JPS56164661A (en) 1980-05-21 1980-05-21 Call auxiliary device

Country Status (1)

Country Link
JP (1) JPS56164661A (en)

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