JPS5797249A - Data transmission system - Google Patents

Data transmission system

Info

Publication number
JPS5797249A
JPS5797249A JP55172567A JP17256780A JPS5797249A JP S5797249 A JPS5797249 A JP S5797249A JP 55172567 A JP55172567 A JP 55172567A JP 17256780 A JP17256780 A JP 17256780A JP S5797249 A JPS5797249 A JP S5797249A
Authority
JP
Japan
Prior art keywords
signal
back tone
circuit
detected
tone signal
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
JP55172567A
Other languages
Japanese (ja)
Inventor
Kazumasa Kumakura
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP55172567A priority Critical patent/JPS5797249A/en
Publication of JPS5797249A publication Critical patent/JPS5797249A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1692—Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts

Abstract

PURPOSE:To make retransmission request, by changing a back tone signal only when errors are detected in received data blocks, through the use of the back tone signal consisting of a single frequency component as a backward signal. CONSTITUTION:Data outputted from a shift register 11 are given to a block number register 15, error detection circuit 18, and buffer memories 10-30. The circuit 18 makes error detection for each one block of received data, and a signal when no error is detected, is applied to an AND gate 17 and a back tone signal generating circuit 19 and a signal when errors are detected, is given to the back tone signal generating circuit 19. The circuit 19 transmits the retransmission request signal of a single frequency, i.e., a NACK signal via a backward channel.
JP55172567A 1980-12-09 1980-12-09 Data transmission system Pending JPS5797249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55172567A JPS5797249A (en) 1980-12-09 1980-12-09 Data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55172567A JPS5797249A (en) 1980-12-09 1980-12-09 Data transmission system

Publications (1)

Publication Number Publication Date
JPS5797249A true JPS5797249A (en) 1982-06-16

Family

ID=15944224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55172567A Pending JPS5797249A (en) 1980-12-09 1980-12-09 Data transmission system

Country Status (1)

Country Link
JP (1) JPS5797249A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5936452A (en) * 1982-08-24 1984-02-28 Matsushita Electric Ind Co Ltd Signal transmitter
JPH02501969A (en) * 1987-01-13 1990-06-28 ブリティシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニ Transmission method
US6256510B1 (en) 1997-09-02 2001-07-03 Nec Corporation Mobile radio communication apparatus capable of reducing power dissipation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4927962A (en) * 1972-07-11 1974-03-12
JPS5267905A (en) * 1975-12-04 1977-06-06 Toshiba Corp Error control system
JPS5573157A (en) * 1978-11-27 1980-06-02 Ricoh Co Ltd Data communication system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4927962A (en) * 1972-07-11 1974-03-12
JPS5267905A (en) * 1975-12-04 1977-06-06 Toshiba Corp Error control system
JPS5573157A (en) * 1978-11-27 1980-06-02 Ricoh Co Ltd Data communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5936452A (en) * 1982-08-24 1984-02-28 Matsushita Electric Ind Co Ltd Signal transmitter
JPH02501969A (en) * 1987-01-13 1990-06-28 ブリティシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニ Transmission method
US6256510B1 (en) 1997-09-02 2001-07-03 Nec Corporation Mobile radio communication apparatus capable of reducing power dissipation

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