Error Control Option for Group 3 Facsimile Equipment.

Abstract

Group 3 facsimile equipment, which meets CCITT Recommendations T.4 and T.30 (Federal Standards 1062 and 1063, respectively), is now used extensively throughtout the world and throughout the U.S. Government. This equipment has no error control capability; the output image quality and transmission bit rate are totally dependent upon the communication circuit during the message transmission period. There are two basic categories of error control schemes for data communications: automatic-repeat-request (ARQ) schemes and forward-error-correction (FEC) schemes; in this report, several algorithms of each type are evaluated, as well as several hybrid algorithms in which characteristics of both schemes are employed. The purpose of this study was to determine the feasibility of an error control option for the Group 3 facsimile standard, which would increase the reliability of transmission over the public switched telephone network (PSTN).

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1987
Accession Number
ADA183476

Entities

Organizations

  • Delta Information Systems (United States)

Tags

Communities of Interest

  • Advanced Electronics
  • Counter IED
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Amplitude
  • Circuit Boards
  • Coders
  • Coding
  • Communication Systems
  • Computer Programming
  • Control Systems
  • Data Links
  • Data Rate
  • Data Storage Systems
  • Data Transmission
  • Decoding
  • Error Correction Codes
  • Errors
  • Facsimile Equipment
  • International Organizations
  • Transmitters

Readers

  • Computer Networking
  • Economics
  • Radio communications and signal processing.