A method and a system for providing ISI compensation to an input signal in
a bifurcated manner. ISI compensation is provided in two stages, a first
stage compensates ISI components induced by characteristics of a
transmitter's partial response pulse shaping filter, a second stage
compensates ISI components induced by characteristics of a multi-pair
transmission channel. First stage ISI compensation is performed in an
inverse response filter having a characteristic feedback gain factor K,
during system start-up. Second stage ISI compensation is performed by a
single DFE in combination with a MDFE operating on tentative decisions
output from a Viterbi decoder. As the DFE of the second stage reaches
convergence, the feedback gain factor K of the first stage is ramped to
zero.