JPS55121751A - Duplex communication terminal circuit - Google Patents

Duplex communication terminal circuit

Info

Publication number
JPS55121751A
JPS55121751A JP2919979A JP2919979A JPS55121751A JP S55121751 A JPS55121751 A JP S55121751A JP 2919979 A JP2919979 A JP 2919979A JP 2919979 A JP2919979 A JP 2919979A JP S55121751 A JPS55121751 A JP S55121751A
Authority
JP
Japan
Prior art keywords
terminal
wire
signal sent
balanced
duplex communication
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
JP2919979A
Other languages
Japanese (ja)
Inventor
Kaoru Yano
Kohei Otake
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2919979A priority Critical patent/JPS55121751A/en
Publication of JPS55121751A publication Critical patent/JPS55121751A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To realize the duplex communication terminal circuit which features the 2-wire/4-wire converting function with a compact design and low cost, by supplying the necessary DC current to the terminal unit via the terminal termination impedance and then securing the high impedance for other circuits. CONSTITUTION:The 2-wire type balanced terminal is connected to terminals 11 and 12, and the current is supplied to the balanced terminal from DC power source 18 via termination resistances 161 and 162. Then constant current source 23 of the high internal resistance is connected to the unbalanced side winding of the balance-unbalance converting transformer; and the signal sent from terminal 14 is transmitted to the 2-wire side. At the same time, amplifier 22 of the high input impedance applies the signal sent from the 2-wire side to differential amplifier 24 to which balanced circuit network 19 is connected. And the signal sent from the 2-wire side is obtained at terminal 13.
JP2919979A 1979-03-13 1979-03-13 Duplex communication terminal circuit Pending JPS55121751A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2919979A JPS55121751A (en) 1979-03-13 1979-03-13 Duplex communication terminal circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2919979A JPS55121751A (en) 1979-03-13 1979-03-13 Duplex communication terminal circuit

Publications (1)

Publication Number Publication Date
JPS55121751A true JPS55121751A (en) 1980-09-19

Family

ID=12269518

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2919979A Pending JPS55121751A (en) 1979-03-13 1979-03-13 Duplex communication terminal circuit

Country Status (1)

Country Link
JP (1) JPS55121751A (en)

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