High Speed Data Line Protection
Quote:
Local Area Network (LAN) data lines require protection
against direct and induced transient over voltages on the
lines. Protecting these lines and the associated network is
not a trivial task. The power range is somewhere between
static discharge (very low power) and lightening protection
which is at the other end of the spectrum (high power).
http://www.vishay.com/docs/88843/anusingr.pdf