JPS5797250A - Data transmission system for automatic retransmission request system - Google Patents

Data transmission system for automatic retransmission request system

Info

Publication number
JPS5797250A
JPS5797250A JP55172568A JP17256880A JPS5797250A JP S5797250 A JPS5797250 A JP S5797250A JP 55172568 A JP55172568 A JP 55172568A JP 17256880 A JP17256880 A JP 17256880A JP S5797250 A JPS5797250 A JP S5797250A
Authority
JP
Japan
Prior art keywords
retransmission request
signal
circuit
error detection
data transmission
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
JP55172568A
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 JP55172568A priority Critical patent/JPS5797250A/en
Publication of JPS5797250A publication Critical patent/JPS5797250A/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 avoid the effect of a backward signal for retransmission request on data of a forward channel, by transmitting a retransmission request signal of a single frequency, only when received data block detects an error. CONSTITUTION:Data outputted from a shift register 11 is applied to a block number register 15, error detection circuit 18, and buffer memories 10-30. The error detection circuit 18 makes error detection for one block of received data, and a signal when no error is detected, is transmitted to an AND gate 17 and a retransmission request (NACK) signal generating circuit 19 and a signal when errors are detected, is given to the circuit 19. When the circuit 19 is informed for the error detection from the circuit 18, it transmits a retransmission request signal (NACK signal) of a single frequency via a backward channel.
JP55172568A 1980-12-09 1980-12-09 Data transmission system for automatic retransmission request system Pending JPS5797250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55172568A JPS5797250A (en) 1980-12-09 1980-12-09 Data transmission system for automatic retransmission request system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55172568A JPS5797250A (en) 1980-12-09 1980-12-09 Data transmission system for automatic retransmission request system

Publications (1)

Publication Number Publication Date
JPS5797250A true JPS5797250A (en) 1982-06-16

Family

ID=15944243

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55172568A Pending JPS5797250A (en) 1980-12-09 1980-12-09 Data transmission system for automatic retransmission request system

Country Status (1)

Country Link
JP (1) JPS5797250A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59198039A (en) * 1983-04-25 1984-11-09 Nec Corp Error control system of data transmitter utilizing telephone network
JPS63207233A (en) * 1987-02-24 1988-08-26 Mitsubishi Electric Corp Error resending control system
FR2660132A1 (en) * 1990-03-23 1991-09-27 Trt Telecom Radio Electr Information transmission system including a plurality of transmission/reception stations

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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59198039A (en) * 1983-04-25 1984-11-09 Nec Corp Error control system of data transmitter utilizing telephone network
JPH0548013B2 (en) * 1983-04-25 1993-07-20 Nippon Electric Co
JPS63207233A (en) * 1987-02-24 1988-08-26 Mitsubishi Electric Corp Error resending control system
FR2660132A1 (en) * 1990-03-23 1991-09-27 Trt Telecom Radio Electr Information transmission system including a plurality of transmission/reception stations

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