JPH0367387B2 - - Google Patents

Info

Publication number
JPH0367387B2
JPH0367387B2 JP27769384A JP27769384A JPH0367387B2 JP H0367387 B2 JPH0367387 B2 JP H0367387B2 JP 27769384 A JP27769384 A JP 27769384A JP 27769384 A JP27769384 A JP 27769384A JP H0367387 B2 JPH0367387 B2 JP H0367387B2
Authority
JP
Japan
Prior art keywords
switch
circuit
telephone
photocoupler
transistor
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.)
Expired - Lifetime
Application number
JP27769384A
Other languages
English (en)
Japanese (ja)
Other versions
JPS61172476A (ja
Inventor
Shigeo Sano
Takashi Tabu
Shigeru Kawami
Nobuyuki Masuda
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 JP59277693A priority Critical patent/JPS61172476A/ja
Publication of JPS61172476A publication Critical patent/JPS61172476A/ja
Publication of JPH0367387B2 publication Critical patent/JPH0367387B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Meter Arrangements (AREA)
  • Devices For Supply Of Signal Current (AREA)
JP59277693A 1984-12-31 1984-12-31 無音転極回路 Granted JPS61172476A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59277693A JPS61172476A (ja) 1984-12-31 1984-12-31 無音転極回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59277693A JPS61172476A (ja) 1984-12-31 1984-12-31 無音転極回路

Publications (2)

Publication Number Publication Date
JPS61172476A JPS61172476A (ja) 1986-08-04
JPH0367387B2 true JPH0367387B2 (cs) 1991-10-22

Family

ID=17586985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59277693A Granted JPS61172476A (ja) 1984-12-31 1984-12-31 無音転極回路

Country Status (1)

Country Link
JP (1) JPS61172476A (cs)

Also Published As

Publication number Publication date
JPS61172476A (ja) 1986-08-04

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