Three cabling systems exceed the 10GBASE-T alien crosstalk
requirements: Category 6 cable constructed with a foil screen (FTP), augmented Category 6 cabling and Category 7 cabling, supporting links up to 100 meters.
Richard Mei: Alien crosstalk
, the interaction between two adjacent cabling systems can only be prevented in one of three ways: shielding; space between cable and connector; or innovative UTP design.
The 500-MHz transmission frequency of 10GBase-T has introduced a new type of noise impairment on balanced UTP cabling systems called alien crosstalk, which is signal or noise coupling between adjacent cables.
Testing for alien crosstalk requires that multiple cables (known as disturber or exciter cables) be energized simultaneously in a cable bundle.
The unit delivers superior near- and far-end crosstalk measurement performance, as well as alien crosstalk
(AXT) measurements-indispensable for testing LAN cabling's suitability for running 10-Gigabit Ethernet.
In addition, alien crosstalk test parameters must be included with the field-certification effort for 10GigE.
Alien crosstalk occurs between every wire in a many-pair bundle, and the combined impact of all wire pairs in the bundle upon the wire pair under test (usually referred to as the victim wire pair) should be assessed.
DataMax 10Gig Patch Cable for CAT 6, 10GBase-T Ethernet channels features excellent resistance to power sum alien crosstalk
(PSAXT) noise, with more than 10-dB margin over the TIA/EIA-568-B.2-10 proposed minimums.
, near-end crosstalk and far-end crosstalk issues associated with copper communications cables are not applicable to optical fiber.
The 10G system reduces alien crosstalk
to a level of approximately 15 dB, 30 times lower than the ANEXT performance for 1000Base-T at 100 meters.
The pairs remain off center as the cable rotates, creating a random oscillating separation effect that prevents alien crosstalk
. This augmented Category 6 cable is backward compatible and can run existing applications, such as 10/100Base-T and 1000Base-T.
When Deaver was searching for a 10-Gbps UTP solution in early 2004, cable manufacturers could not demonstrate Shannon's capacity of 18 Gbps at 100 meters, due primarily to alien crosstalk
, which is the amount of noise measured on a pair within a cable that is induced from an adjacent cable.