Datacenter Dynamics just put out this great piece on 10GBase-T networks. These networks operate in the frequency spectrum at around 500 MHz and much of this cross talk interference occurs at the 250-500 MHz range. The solution? You can either have a shielded or unshielded solution to avoid this cross talk.
A cable shield offers additional mechanical stability as well as reliable protection against unwanted signals and the resulting crosstalk. Shielded cabling, by design, automatically curbs ANEXT if it is installed correctly and is of a sufficiently high quality.
In many respects, shielded cables are an ideal solution for 10GBase-T. However, the shielding for this type of cable must be handled carefully and consistently. Because many markets have not traditionally used shielded cables, installers in these markets have little experience in the correct way to handle shielding. Unshielded copper cabling is easier to install, and therefore less expensive. This is an important part of the reason for its widespread global adoption.
Which solution works best? The article argues:
A safe bet would be to choose cabling specified in accordance with class EA as stipulated by ISO/IEC 11801 coupled with connection technology in accordance with Cat. 6A as stipulated by IEC 60603-7-41/-51. Compared with Telephone Industry Association requirements, this standard has stricter regulations regarding transmission parameters. Therefore, it is better equipped to cope with the challenges that the future will bring.