Bandwidth-Efficient Digital Transmission up to 155 Mb/s over Unshlelded Twisted Pair Wiring

摘要

This paper describes techniques for achieving data rates upto 155 Mb/s over unshielded twisted pair wiring in premises distribution systems.These high data rates represent an improvement of about an order of magnitude in speed when compared to presently available data rates for local area networks operating over this communication medium.The transmission scheme proposed for achieving these igher data rates is carrierless AM/PM(CAP).which is a bandwidth-efficient two-dimensional pessband line code.Specitically,it is shown that a 32-CAP line code Can be used to provide the FDDI rate of 125 Mb/s over 100 meters of voicegrada UTP wiring in a channel bandwidth of 30 MHz,which results in a robust performance and eliminates potential problems with electromagnetic radiation limits above 30 MHz.