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Alien Xtalk theory 

Alien crosstalk measurements

According to the latest industry standards, which are still under preparation or are awaiting final approval, e.g. EIA/TIA, 10 Gbit cables should be subject to additional electrical tests which have not previously been required.

10 Gbit cables may be constructed in a configuration with 28 pairs. This design has one 4 pairs bundle in the centre which is surrounded by 6 additional four pairs bundles. Each bundle will be jacketed individually and an additional jacket will be put around the 7 four pairs bundles. This cable geometry requires so called "alien" tests to be performed. Typically, it is required to know what influence the pairs around the central bundle have on each of the pairs composing the central bundle. This means that the crosstalk between each pair of the central bundle and each one of the 24 pairs of the 6 "external" bundles should be measured.

The following parameters are required by the latest standards:

• Alien Near-End Crosstalk (also called ANEXT)
• Power Sum ANEXT (calculation for each of the pairs in the central bundle)
• Alien Equal Level Far-End Crosstalk (also called AELFEXT)
• Power Sum AELFEXT (calculation for each of the pairs in the central bundle)
• AESA has developed a 28 pairs connecting frame which permits full automation of all these new tests.