To: SteveG who wrote (543 ) 5/31/1998 6:53:00 PM From: Frank A. Coluccio Read Replies (1) | Respond to of 5853
Steve, after reading the links you posted in #543, I have a few comments and observationsthat I'd like to pass by you and others here. In the article titled "Optical interconnects getting supercharged," the chirped pulse techniques caused me to reflect and reinforce my belief that among the next steps in the 'digital revolution,' we will see some old familiar forms or analog modem technology re-introduced into the optical domain, such differential phase angle modulation, and eventually full blown QAM techniques, once the theoretical limits of baseband optical on-off have been exhausted per individual fiber. ---- In the MCI article that speaks to their use of Solitons in the future, I found their selection of the St. Louis to Chicago route an interesting venue for testing this 'new' (164-year-old-theory) of transmission with Pirelli. Isn't this the same "truckers' route" that McGowan beat the Bell System over the head with during the deployment of their first analog microwave systems back in the Seventies? Do I sense a sort or romantic recapitulation here? ----- [[ In "Internet2 faces engineering hurdles" I found the following to be of interest on a personal level: "What universities want to show is how people can communicate in sign language over a network-and for that you need extremely high-quality video, the kind that Internet2 is focused on." During several years of pro bono work that I performed for the city university here in NY, I was involved with architecting a distance learning platform that included programs for the deaf. We had an OC-48 ring throughout the city at our disposal, but this couldn't help where outlying schools were concerned, and T-3 bandwidth was out of the question for most of the on-net schools, as well. We found that a minimum of 6 Basic Rate Interface ISDN lines (12 bearer channels) were needed in order to begin to perceive subtleties of ASL syntax, whereas only 2 or 3 BRIs, (4 or 8 bearer channels) were needed for satisfactory use by unimpaired students. During this period I was also privileged to become familiar with some distance learning work done for deaf and blind students. A notable program that was done between Rochester Institute of Tech and Gallaudet University, utilizing email to conduct a drama class, serving as a model for other schools in this pursuit. It was very primitive by the standards we now hold as the norm, but it was incrementally very useful to those involved at the time. ]] ========= In the article titled "Chip makers taking aim at SONET/SDH" came the following: "On the other hand, the possible shift toward wavelength division multiplexing(WDM) technologies among various carriers could dampen the growth of ATM, SONET, and related networking topologies, analysts said. Traditional fiber-optic cable can now carry only one circuit at a time, but WDM can transport up to 10 simultaneous circuits-each at up to 622 Mbits/s over short distances and 200 Mbits/s over long distances. In the future, WDM could support 20 to 50 simultaneous circuits, for total data rates of more than 31Gbits/s." I have to stop and wonder where all of those 20 to 50 simultaneous streams are going to come from, if not from the electrically fueled ATM, IP, SONET and so forth, that the author implies will be displaced. There are no intrinsic, standalone, optical drivers at the applications levels yet that can be deployed in a globally orchestrated manner. Until there are, there will be a need for ATM, Frame Relay and SONET functions, if not in the heart of the backbone, then surely at the user application levels. To assume otherwise is to also assume that there is an infrastructure in place that will support optical paths directly to users' applications at the business and premises. Regards, Frank Coluccio