文档介绍：munications Handbook
for Transportation Professionals
The Basics of munications
Final Report
September, 2004
Notice
This document is disseminated under the sponsorship
of the Department of Transportation in the interest of
information exchange.
The United States Government assumes no liability for its contents or use thereof.
Technical Report Documentation Page
1. Report No. 2. Government Accession No. 3. Recipient's Catalog No.
FHWA-HOP-04-034
4. Title and Subtitle 5. Report Date
munications Handbook for Transportation Professionals August, 2004
The Basics of munications
6. anization Code
7. Author(s) 8. anization Report No.
Sheldon Leader
9. anization Name and Address 10. Work Unit No. (TRAIS)
11. Contract or Grant No.
12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered
14. Sponsoring Agency Code
15. Supplementary Notes
16. Abstract
This handbook was created to provide individuals responsible for managing and implementing Traffic
Signal, and Freeway Management programs with an understand of the basic technologies of
munications. The handbook provides a brief look at the history of munications so that
its readers may gain an understanding of why various processes exist, and how the technologies
evolved. The handbook is not designed to be used as a specification for munication systems.
The technologies associated with munications are in a constant state of change. This handbook
was written over a two year period between August, 2002 and June 2004. During this time, a number of
emerging technologies began to reach maturity. The most significant of these, wireless access,
and voice over IP have caused the major carriers (panies) to announce the construction of
new facilities to provide “ Telephony” services.
Readers of this handbook should gain an understanding of the basic technologies underlying most
munications systems desi