To: willkm3 who wrote (29185 ) 8/1/2000 3:06:52 PM From: EJhonsa Respond to of 54805 "Nortel's high-end DWDM system delivers up to 320 gbps with 32 channel DWDM on OC-192 fiber." "...Lucent's WaveStar OLS 400G optical networking system delivers up to 400 gbps capacity with 40 OC-192 channels." Nice post Will. I just want to correct one error within it: Nortel's high-end system, the OpTera 1600, can handle 160 OC-192 wavelenghts for a total of 1.6 tb/s, making it the undisputed leader in this field for now (see nortelnetworks.com . According to Gilder, Lucent's got a 320-wavelength system in the works, but each channel operates only at OC-48 (thus the 800 gb/s system you were talking about. Meanwhile, Nortel's demoed an 80 gb/s, 80-channel system in its labs. Yes, you're math's right. The end result is an obscene 6.4 tb/s of capacity. That should allow them to hold off NEC and its 3.2 tb/s, assuming that someone will want/need all that bandwidth. Of course, every time people (including me) have pondered the possibility of a bandwidth glut, another set of blowout quarters by Nortel, SDL, and JDS Uniphase has shut them up pretty quickly. What's even more remarkable about all of this is that I'm sure a large percentage of all of this traffic growth is simply coming from existing 56K users spending more time online. When broadband really starts taking off, the sky's the limit. One last thing to keep in mind is that system capacity numbers aren't all that matter. For example, carriers may be willing to pay an additional premium for Nortel's ULTRA long-haul system which it got from QTera, due to the fact that it can send wavelengths 4,000 km without the need for regeneration, leading to tremendous cost savings, especially if you use all-optical switches, thus getting the need for regeneration at network junctions. Another thing to keep in mind is that if a carrier has to decide between two systems with equal capacity, one with a larger number of wavelengths, another with higher wavelength bit-rates, the latter will generally be cheaper. The reason for this is that for every wavelength used in a DWDM system, you need an additional laser, modulator, receiver, filter, etc. You also need more amplifiers for such systems. This is why Nortel, which has tended to focus on bitrates rather than channel counts, has been so successful. Gilder, of course, has been critical of Nortel and high on Lucent for this reason, predicting an era where individual data transmissions are allotted their own channels, preciptating the need for as many wavelengths as possible, with minimal attention being paid to bitrates. But Gilder be damned, such an era is at least several years away, perhaps longer, and it's Nortel, by going against this philosophy and making a fortune now, that should have the greatest R&D resources when that era finally comes. Eric PS - Mark, Apollo, thanks for the compliments.