Communication links:
AV Wiring
New Amplifiers Simplify Wideband Techniques
Wire & cable mystery
Designing with differential signals
Transmission lines:
Balanced Line Technology
Balanced twisted pair as a transmission line
Differential Transmission Lines
Transmission Lines
Wave propagation
LVDS:
LVDS Owner's Manual Page
Measuring crosstalk in LVDS systems
Low-Voltage Differential Signaling
National Semiconductor LVDS Design Guide
Telecom:
Welcome to the International Telecommunication Union