Bruce Perens goes into some electrical theory regarding grounding [perens.com] of the new Cat 7 Ethernet cables.
The advent of Category 7 cable, which includes four individually shielded twisted pairs, has introduced grounding to the concerns of the network engineer. The general advice of wire manufacturers, and the general configuration of pre-manufactured cables, is for both ends to be grounded. This is contrary to common knowledge in electrical engineering regarding ground loops and the potential for lightning-induced current.