Analysis of Delays in Transmitting Time Code Using an Automated Computer Time Distribution System

Abstract

An automated computer time distribution system broadcasts standard time to users using computers and modems via telephone lines. For users who need traceable time, it is of particular interest to know the uncertainty of time information received. Factors that contribute to transmission delays in a telephone network have been measured and analyzed. The results revealed several dominant factors that contributed to delays - software platform (50% of the delay), transmission speed of time-codes (25%), telephone network (15%), modem and others (10%). The standard deviation of delays is below 20 ms in all cases. The results allow us to estimate that, within Singapore, an uncertainty of about 20 milliseconds is achievable using the system.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1999
Accession Number
ADA497125

Entities

People

  • A. M. Kyaw
  • H. A. Chua
  • J Levine
  • Y. Shan

Tags

Communities of Interest

  • Autonomy

DTIC Thesaurus Topics

  • Abstracts
  • Clocks
  • Computers
  • Diurnal Variations
  • Electronic Mail
  • Errors
  • Information Operations
  • Intervals
  • Measurement
  • Platforms
  • Singapore
  • Standards
  • Telephone Lines
  • Time Intervals
  • Transmitting
  • Uncertainty

Fields of Study

  • Computer science

Readers

  • Computational Modeling and Simulation
  • Positioning, Navigation, and Timing (PNT) Technology.
  • Radio communications and signal processing.