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DSP-100/2000
Users Manual
3-4
Link Performance Grade Result (Headroom)
When an Autotest is complete, the display shows the overall result (pass or fail)
and the worst-case NEXT margin, or headroom. Headroom is the smallest
difference found between the measured NEXT value and the limit. This number
serves as a figure of merit that reflects the overall performance of the link.
Automatic Diagnostics (Model DSP-2000)
If an Autotest fails, you can press the FAULT INFO key to see more specific
information on the cause of the failure. Figure 3-2 shows examples of automatic
diagnostics displays for a NEXT failure and an open pin failure.
The arrow in the diagram at the top of the display shows the location of the
failure. The bottom half of the display describes the failure and suggests ways to
fix the fault. When appropriate, softkeys let you see the plot or plots relevant to
the failure. If more than one fault was found, you can use the
$Next Fault and #Prev Fault softkeys to scroll through the
diagnostics displays.