DSP-4000 Series
Users Manual
2-10
Autotest on Twisted Pair Cabling
Autotest performs all of the tests necessary to determine if the cabling you are
testing meets the test standards specified for your LAN installation.
The following tests apply to twisted pair cabling:
• Headroom report (The worst-case margin for a parameter determined by the
selected standard. This may be NEXT, ACR, PSNEXT, or another
measurement.)
• Wire Map
• Resistance
• Length
• Propagation Delay
• Delay Skew
• Impedance
• NEXT and ELFEXT (Near-End and Equal Level Far-End Crosstalk)
• Attenuation
• ACR (Attenuation to Crosstalk Ratio)
• RL (Return Loss)
• PSNEXT (Power Sum NEXT)
• PSELFEXT (Power Sum Equal Level Far-End Crosstalk)
• PSACR (Power Sum ACR)
When you start an Autotest, the test tool displays a message if the attached link
interface adapter does not support the selected test standard.
To Autotest twisted pair cabling, refer to Figures 2-4 through 2-6 and proceed as
follows:
Note
If the calibration message appears after you start the Autotest, refer
to “Calibrating the Test Tool” in Chapter 6 for complete calibration
instructions.
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