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To: Frank A. Coluccio who wrote (3699)	5/13/1999 2:07:00 AM
From: Bernard Levy	Respond to of 12823

Hi Frank: I share your skepticism about GE to the desktop at the current time. However, it has become obvious that FE is a must for many engineering applications involving exchanging simulations data between workstations. So, GE to the desktop in professional environments may come sooner than I thought. The design of chips complying to the 802.3ab standard is extremely challenging. A 5-level PAM modulation scheme is used for each line, which ultimately reduces the voltage range for opening the sampling eye to 0.5V. So trellis coded modulation is used with a Viterbi decoder. Adaptive filters must also be used to remove the interference of all 4 cables with one another. This is an impressive engineering feat. A perhaps nitpicking point however is that the standard which is being implemented was not proposed by BRCM, but by LEVL/INTC based on earlier work by one of its engineers in collaboration with G. Ungerboek and others at IBM Zurich on FE over 2 CAT3 cables, a standard which was never adopted since CAT5 cabling has become prevalent. Best regards, Bernard Levy