Abstract
This chapter describes the design of two high-speed data transmission systems over unshielded twisted-pair cables. For the efficient implementation of near maximum likelihood sequence detection of quaternary partial response class-IV (QPR-IV) signals, it considers the reduced-state Viterbi detector. The chapter also describes the 100BASE-T2 system for fast Ethernet. For 100BASE-T2 a dual-duplex baseband transmission concept was adopted. High-speed full-duplex transmission over two separate wire pairs with near-end crosstalk (NEXT) cancellation and full-duplex transmission over a single pair with echo cancellation pose similar challenges. In the latter case, a hybrid is included to separate the two directions of transmission; a QPR-IV transceiver with NEXT cancellation can then be used also for full-duplex transmission over a single pair, as in this case the NEXT canceller acts as an echo canceller.
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