Chapter 7
Cable Testing Fundamentals
7-30
Headroom Test
The Headroom measurement is a mathematical analysis of the data already existing
from previous tests. The calculated value is the sum of the Power Sum ACR test
(Power Sum ACR of the worst pair after the attenuation for that pair has been
normalized to 100 meters or 328 feet) and the additional margin between the worst
case PS NEXT and the limit for PS NEXT.
Headroom provides a simplified means of reporting the margin available in a single
cable run which will support an application with error-free performance. It also
gives an indication of additional margin which may be achieved through the
utilization of “enhanced” cable and connectors and careful installation practices.
Note: The RH is required to perform this test.
Содержание LANTEK
Страница 1: ...IDEAL INDUSTRIES LANTEK CABLE TESTERS USER S GUIDE 01 FEBUARY 2002 MANUAL PART 6510 00 5000 REV A ...
Страница 80: ...Chapter 3 Calibration Configuration and Special Operations 3 39 store up to 10 custom cables ...
Страница 116: ...Chapter 4 Autotesting 4 24 ...
Страница 124: ...Chapter 5 Analyze Testing 5 8 ...
Страница 172: ...Chapter 6 Using LANTEK REPORTER 6 48 ...
Страница 208: ...Appendix A Safety Precautions A 4 ...