Table of Contents:

Definition and Overview

1. Introduction

2. Why Fax Testing Is Necessary

3. Fax Operation Overview

4. Basic Fax System Structure and Process

5. Message Repetitions and Time-Outs

6. Fax System Test Issues

7. Network Test Issues

8. Common Deviations from ITU Standards

9. Fax Testing Customer Types

10. Fax Testing Application Areas

11. Conclusion

Self-Test

Glossary

PDF of this tutorial

Fax testing is a necessity not only in engineering labs where fax products are created, but also in many other areas. Fax testing application areas include the following:

• real-time testing to view operations in detail
• test bed to send and receive faxes

• worst case testing
• regression testing using comparison with standard reference calls
• generation of customized reports to document results

• testing T.30 compliance and interoperability
• comparison with standard reference calls to spot performance deviations
• generation of reports tailored to production needs

• requirement to send and receive faxes from customer’s systems
• real-time testing and analysis of customer’s problems
• cellular fax operations
• simulation of unique cellular problems—carrier dropouts, etc.

• generation of large volumes of simultaneous calls for load testing

• end-to-end testing to record and analyze delay effects
• real-time monitoring to show effects of network noise and distortion
• gateway testing
• T.30 compliance and interoperability testing
• generation of simultaneous calls for load testing