South West IT

reference

Tests explained

Wiremap

Cat x cables consist of pairs of wires twisted together. This checks that same wire has been used in the same position at each end. It does not check that the pairs have been correctly allocated.

Length

Cables should be no longer than specified by the Cat X standard.Prop delay

The amount the signal is delayed by transit through the cable.

Delay & Skew

This test measures the amount the signal is delayed and compares with the worst delay experienced.

Attenuation

The overall loss of signal along the cable.

NEXT & FEXT

Near End Cross(x) Talk and Far End Cross(x) Talk measure the amount that signals running in one pair will interfere with signals in another pair.

Power Sum NEXT

Power Sum Near End Cross(x) Talk measure the amount that signals running all pairs will interfere with signals in one pair.

ELFEXT

Equal Level Far End Cross(x) Talk measure the amount that signals running in one pair will interfere with signals in another pair.

Power sum ELFEXT

Power sum Equal Level Far End Cross(x) Talk measure the amount that signals running in all pairs will interfere with signals in tested pair.

ACR

Attenuation Cross(x)talk Ratio compares the signal loss over the pair with the amount of interference between pairs.

Power Sum ACR

Power Sum Attenuation Cross(x)talk Ratio compares the signal loss over the pair with the amount of interference between all pairs.

Return Loss

Pretty much what it says!

Note:-

These explanations are intended to give the lay person an idea of what the tests are about. They are not the technical specification of the test.

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