Attenuation Test Results

To display the ATTENUATION screen, press View (F1) from the AUTOTEST RESULTS screen, then press the ¬ arrow key until the ATTENUATION screen is displayed.

At the upper left of the screen, the pair corresponding to the displayed result is shown. The Attenuation, in decibels (dB), is shown centered and the frequency is shown to the right. The PASS/FAIL bar across the screen compares the measured Attenuation value to the Attenuation limit value. The Autotest name is displayed after Spec: at the lower left of the screen.

Press Detail (F1) to display the frequency sweep range and the test results for all pairs.

Press Pair (F3) to toggle through the Attenuation results for each pair combination.

Press the or arrow key to display the previous or next test results screen.

Press the ESCAPE key to return to the AUTOTEST RESULTS screen.

Note: For diagnostic purposes, you can run Attenuation continuously by pressing the Measure Cable Performance key and selecting Attenuation.

Attenuation Detail

To display this screen, press Detail (F1) from the ATTENUATION screen. This screen displays the frequency sweep range and the worst case Attenuation for each pair.

Press Graph (F1) to enter graphing mode. Graph (F1) is available when Save Sweep Data: Attn has been selected in the SAVE AUTOTEST screen or when viewing results immediately after running the Autotest.

Press Pair (F3) to toggle through the available pair combinations.

Press the ESCAPE key to return to the Attenuation screen.

Attenuation Graph

To display this screen, press Detail (F1) from the ATTENUATION screen, then press Graph (F1). This screen displays the Attenuation graph for the indicated pair combination.

Press Zoom (F1) to magnify the area of the graph around the cursor. The Zoom key can select 1x, 2x, 5x or 10x magnification.

Press Print (F2) to print the Attenuation graph.

Press the ESCAPE key to return to the Attenuation Detail screen.

Attenuation-to-Crosstalk Ratio (ACR)

Attenuation-to-Crosstalk Ratio (ACR) is an indication of how much larger the received signal is compared to the noise (NEXT) on the same pair. ACR reports the difference between NEXT and Attenuation on the cable. Both Attenuation and NEXT are measured and the ACR value is computed at each measured Attenuation frequency. The worst case ACR is reported for each pair combination.

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Microtest TSB-67 - 568A Annex E manual Attenuation Test Results, Attenuation Detail, Attenuation Graph