JPS57183151A - Data transmitter - Google Patents

Data transmitter

Info

Publication number
JPS57183151A
JPS57183151A JP56068552A JP6855281A JPS57183151A JP S57183151 A JPS57183151 A JP S57183151A JP 56068552 A JP56068552 A JP 56068552A JP 6855281 A JP6855281 A JP 6855281A JP S57183151 A JPS57183151 A JP S57183151A
Authority
JP
Japan
Prior art keywords
time
terminal
flag
detected
telegraphic message
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
JP56068552A
Other languages
Japanese (ja)
Other versions
JPH0137891B2 (en
Inventor
Shigeo Nakatsuka
Mitsuhiro Ishizaka
Takane Kakuno
Tachiki Ichihashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56068552A priority Critical patent/JPS57183151A/en
Publication of JPS57183151A publication Critical patent/JPS57183151A/en
Publication of JPH0137891B2 publication Critical patent/JPH0137891B2/ja
Granted 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
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To achieve error detection without lowering an effective transmission speed by equalizing the inspection time when an error is detected by detecting a change of a flag in a frame to the time for the longest telegraphic message transmission of data sent out of a terminal. CONSTITUTION:The flag K of a CH1 consists of two bits and logic ''0'' shows that a data frame is empty; and the 1st bit is set to ''1'' for a use state of the 1st kind and the 2nd bit is set to ''1'' for that of the 2nd kind. When said flag K is set to ''1'' continuously between time t0- time tz owing to a noise, etc., inspection time Tf is nearly equal to time Tm required by one terminal TU to send a telegraphic message of the longest length, and consequently even if the K is set to ''0'' after some terminal TU finishes transmitting a telegraphic message and another terminal TU starts using the same channel before the ''0'' arrives at a channel recovery device (ECR)5, the K is set to ''2'' once without fail and it is detected by the ECR5. Therefore, if the ''0'' or ''2'' is not detected even once during said period Tf, the channel is discriminated as an error and the K is set forcibly to ''0'' at time tz.
JP56068552A 1981-05-07 1981-05-07 Data transmitter Granted JPS57183151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56068552A JPS57183151A (en) 1981-05-07 1981-05-07 Data transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56068552A JPS57183151A (en) 1981-05-07 1981-05-07 Data transmitter

Publications (2)

Publication Number Publication Date
JPS57183151A true JPS57183151A (en) 1982-11-11
JPH0137891B2 JPH0137891B2 (en) 1989-08-10

Family

ID=13377033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56068552A Granted JPS57183151A (en) 1981-05-07 1981-05-07 Data transmitter

Country Status (1)

Country Link
JP (1) JPS57183151A (en)

Also Published As

Publication number Publication date
JPH0137891B2 (en) 1989-08-10

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