Home Network Basis: Transmission Environments and Wired/Wireless Protocols

7.1. HomePNA 1.0

The idea of an existing telephone wiring–based home network system was originated from Tut System. Matt Taylor, the founder of Tut System, worked with his engineers to develop a proper signaling method over the home telephone wiring system. They had constructed a patch panel with telephone cables of different lengths to emulate some worst-case topologies. They found that the channel dispersion becomes a major impairment when the pulse-signaling rate approaches 200 kHz. To carry more information bits per signaling symbol while avoiding extensive signal processing, the PPM was used. In a PPM system, the time interval between adjacent pulses is slightly different depending upon the encoded information. The next pulse's position ...