EPR4Extended Class-4 Partial Response
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The 88C3000 has a selectable PR4 and EPR4 Viterbi with 8/9 or 16/17 ENDEC and is designed for user bit densities (UBD) of 1.
raised the PRML performance standard yet another notch as first samples of its 88C2020 were announced, offering 240 Mb/s user-selectable EPR4 and PR4 with a Viterbi detector and a choice of 16/17 or 8/9 Endec functionality.
The HP E5020S PRML Read/Write Analyzer is a VXI-based test module designed to test all existing classes of PRML: PR4, EPR4 and E2PR4.