LANTEK User Manual - Ideal Industries
LANTEK User Manual - Ideal Industries
LANTEK User Manual - Ideal Industries
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Chapter 3<br />
Structured Cable Field Calibration and Testing<br />
ACR and Power Sum ACR Test<br />
The ACR (Attenuation-to-Crosstalk Ratio) test performs a mathematical comparison<br />
(difference calculation) between the results of the Attenuation and NEXT tests. The<br />
difference reading between each pair gives an indication of how problem-free the<br />
cable pair will be for transmissions.<br />
The ACR measurements are calculated pair-to-pair. The Power Sum ACR<br />
measurements are calculated by summing the NEXT between a selected pair and the<br />
other three pairs in the same cable sheath.<br />
Figure 3-21: ACR and Power Sum Test Screens<br />
ACR and Power Sum ACR Errors<br />
A large difference reading is desirable, since it indicates a strong signal and little noise<br />
interference.<br />
Troubleshooting ACR and Power Sum ACR Problems<br />
Refer to the NEXT and Attenuation troubleshooting suggestions.<br />
3-31
Change language