JPS5466706A - Echo prevention system in semi-duplex communication - Google Patents

Echo prevention system in semi-duplex communication

Info

Publication number
JPS5466706A
JPS5466706A JP13304977A JP13304977A JPS5466706A JP S5466706 A JPS5466706 A JP S5466706A JP 13304977 A JP13304977 A JP 13304977A JP 13304977 A JP13304977 A JP 13304977A JP S5466706 A JPS5466706 A JP S5466706A
Authority
JP
Japan
Prior art keywords
semi
wire
wire side
duplex repeater
input circuit
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
JP13304977A
Other languages
Japanese (ja)
Other versions
JPS584854B2 (en
Inventor
Eihiko Harada
Jiro Takeshima
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP52133049A priority Critical patent/JPS584854B2/en
Publication of JPS5466706A publication Critical patent/JPS5466706A/en
Publication of JPS584854B2 publication Critical patent/JPS584854B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/22—Repeaters for converting two wires to four wires; Repeaters for converting single current to double current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To completely suppress echo phenomenon, by feeding back the start polarity information of the transmission output at four wire side to the input circuit at four wire side, and by holding the four wire input to semi-duplex repeater to stop polarity. CONSTITUTION:The polarized relay PRO constitutes the semi-duplex repeater 1, and the polarized relay PR1 constitutes the four wire side input circuit 2. After the completion of communication line, the start polarity information of the four wire transmission output of the semi-duplex repeater 1 is fed back 7 to the four wire side input circuit, allowing to hold the four wire input to the semi-duplex repeater 1 to the stop polarty independently of the incoming signal from opposing station. Thus, the echo phenomenon can completely be suppressed.
JP52133049A 1977-11-08 1977-11-08 Echo prevention method for half-duplex communication in telegraph exchange Expired JPS584854B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52133049A JPS584854B2 (en) 1977-11-08 1977-11-08 Echo prevention method for half-duplex communication in telegraph exchange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52133049A JPS584854B2 (en) 1977-11-08 1977-11-08 Echo prevention method for half-duplex communication in telegraph exchange

Publications (2)

Publication Number Publication Date
JPS5466706A true JPS5466706A (en) 1979-05-29
JPS584854B2 JPS584854B2 (en) 1983-01-28

Family

ID=15095611

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52133049A Expired JPS584854B2 (en) 1977-11-08 1977-11-08 Echo prevention method for half-duplex communication in telegraph exchange

Country Status (1)

Country Link
JP (1) JPS584854B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50151410A (en) * 1974-05-24 1975-12-05
JPS5275904A (en) * 1975-12-22 1977-06-25 Nippon Telegr & Teleph Corp <Ntt> Semi-double circuit
JPS52130216A (en) * 1976-04-26 1977-11-01 Hitachi Ltd Automatic compensation system of subscriber line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50151410A (en) * 1974-05-24 1975-12-05
JPS5275904A (en) * 1975-12-22 1977-06-25 Nippon Telegr & Teleph Corp <Ntt> Semi-double circuit
JPS52130216A (en) * 1976-04-26 1977-11-01 Hitachi Ltd Automatic compensation system of subscriber line

Also Published As

Publication number Publication date
JPS584854B2 (en) 1983-01-28

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