JPS56131235A - Two-wire/four-wire converter - Google Patents

Two-wire/four-wire converter

Info

Publication number
JPS56131235A
JPS56131235A JP3353280A JP3353280A JPS56131235A JP S56131235 A JPS56131235 A JP S56131235A JP 3353280 A JP3353280 A JP 3353280A JP 3353280 A JP3353280 A JP 3353280A JP S56131235 A JPS56131235 A JP S56131235A
Authority
JP
Japan
Prior art keywords
signal
completion
wire
line
minimizes
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
JP3353280A
Other languages
Japanese (ja)
Other versions
JPS6214970B2 (en
Inventor
Hiroshi Kodera
Toshihiko Wakahara
Masaharu Shimada
Masao Yamazawa
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
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
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, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP3353280A priority Critical patent/JPS56131235A/en
Publication of JPS56131235A publication Critical patent/JPS56131235A/en
Publication of JPS6214970B2 publication Critical patent/JPS6214970B2/ja
Granted 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/03—Hybrid circuits

Landscapes

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

Abstract

PURPOSE:To improve the quality of transmission by making high-precision adjustment, by obtaining a completion confirming signal by sending a completion signal by obtaining a balanced circuit which minimizes a turn-around signal, by supplying a test signal from a pattern generator to a hybrid transformer. CONSTITUTION:As reset switch 25a is operated, three-contact switch 15a is not connected to any contact and the output of four-wire transmitter-receiver 11a is disconnected from two-wire line 28. A test signal from pattern generating circuit 19a is supplied to hydbrid transformer 16a via switch 15a to obtain a balanced circuit which minimizes a turn-around signal. Then, a sine wave signal of frequency f1 is sent to line 28 as a completion signal. At a party station, on the other hand, this signal f1 is level-detected 24b via hybrid transformer 16b and a sine wave signal of frequency f2 is sent as a completion confirming signal to line 28. Then, the completion confirmation signal is level-detected 24a. Thus, high-precision adjustments are made to improve the quality of the transmission.
JP3353280A 1980-03-19 1980-03-19 Two-wire/four-wire converter Granted JPS56131235A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3353280A JPS56131235A (en) 1980-03-19 1980-03-19 Two-wire/four-wire converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3353280A JPS56131235A (en) 1980-03-19 1980-03-19 Two-wire/four-wire converter

Publications (2)

Publication Number Publication Date
JPS56131235A true JPS56131235A (en) 1981-10-14
JPS6214970B2 JPS6214970B2 (en) 1987-04-04

Family

ID=12389151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3353280A Granted JPS56131235A (en) 1980-03-19 1980-03-19 Two-wire/four-wire converter

Country Status (1)

Country Link
JP (1) JPS56131235A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0193733A2 (en) * 1985-03-05 1986-09-10 Neumann Elektronik GmbH Method for matching a hybrid amplifier circuit to a telecommunication line, and device for carrying it out
JPS62227249A (en) * 1986-03-28 1987-10-06 Taiko Denki Seisakusho:Kk Door phone circuit
JPH0421086U (en) * 1990-06-08 1992-02-21
JPH08325814A (en) * 1995-05-29 1996-12-10 Taniguchi Shoten:Kk Resin glove and its production

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0193733A2 (en) * 1985-03-05 1986-09-10 Neumann Elektronik GmbH Method for matching a hybrid amplifier circuit to a telecommunication line, and device for carrying it out
JPS62227249A (en) * 1986-03-28 1987-10-06 Taiko Denki Seisakusho:Kk Door phone circuit
JPH0358223B2 (en) * 1986-03-28 1991-09-04 Taiko Denki Seisakusho Kk
JPH0421086U (en) * 1990-06-08 1992-02-21
JPH08325814A (en) * 1995-05-29 1996-12-10 Taniguchi Shoten:Kk Resin glove and its production

Also Published As

Publication number Publication date
JPS6214970B2 (en) 1987-04-04

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