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To: Scrapps who wrote (3016)	3/22/1998 9:59:00 PM
From: SteveG	Read Replies (1) \| Respond to of 9236

Etherloop seems very similar to Paradyne's MVL (multiple virtual line) I know that Paradyne's Bill Betts, considered one of the world's top modem designers, was testing versions of this modem (as the "MVM") earlier this decade. I wonder if NorTel's (actually Jack Terry's) Etherloop precedes MVM, or if there are any patent infringements from either technology on the other? In any case, a top xDSL engineer raised consideration that even if EDSL doesn't xtalk within itself, it may well still cause bursts of errors (from xtalk collisions with received signals) with other DSL services in the binder (eg., T1, HDSL, ADSL), depending on the power spectrum used. We'll see if Nortel is right and that Bellcore's test will offer a spectral "clean bill" audit for their submission to ITU and/or IEEE. But another twist is his postulation that ADSL could also work by shutting off transmission between bursts of data (since the original Telebit modems worked this way). His caveat regarding ADSL working this way is: "..It's just that the DSL line is often limiting in rate, thus making the data flow nearly continuous. In these cases, solutions like Etherloop, which use a statistical crosstalk model based on activity, get no performance gain at all (and actually lose capacity due to inter-packet guard intervals on the DSL data stream) because they are always transmitting..." So we'll see how the press plays it up, how testing results and standards bodies react, and most importantly, how much more confusing and uncertain this makes it for the RBOCs to actually commit $$ to deploy. I suspect (as I have argued on SI for almost a year) the wait will be much longer than most had expected or hoped. In the meantime, my cable modem should be hooked up (w/an unconditional 60 day 100% money back guarantee) in a few weeks...