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Non-Tech : Amati investors -- Ignore unavailable to you. Want to Upgrade?

To: SVogel who wrote (31147)	5/23/1999 2:44:00 PM
From: JW@KSC	Read Replies (2) \| Respond to of 31386

Re: Steve - I Want My G.DMT You mentioned TI/Amati has a full-rate G-lite modem, according to Carlini. Steve, Your statement reminds me of the game where one person tells a story and passes it down the line to 10 other people. When the last person recounts the story it is totally distorted. No offense intended, but I'm sure you know I hate it when the FAQ's get distorted. I never saw Ron Carlini at N+I, the information on TI's Full Rate G.Lite modem came from a TI ADSL Rep. at the show. Message 9549993 Question: Did TI/Amati resolve the power consumption problem? And does T1/Amati's full-rate version stand a chance of being crowned the standard G-lite at the regulatory meeting next month over Aware's now defacto version? Or is G-lite simply G-lite, full-rate or not? 1. Power Consumption - I don't know! 2. I doubt if TI's Full Rate would be crowned over Aware's defacto. But then I've seen stranger things happen in the DSL World ;^) If so, I imagine both TI/Amati and Aware should benefit equally; leasing rates (and support?) would be the competitive issue(s). I like Aware, and it's certainly getting a lot of positive media Support--but I'm concerned about their licensing-revenues-only business model. I'm concerned they'll be in competitition with TI's intellectual property and TI's strength as a partner. I also seem to recall that the licensing-only model didn't promise to generate enough revenue for Amati--they talked about producing modems in addition to licensing before being bought out. Thanks for any insights. Steve I have not keep up with Aware's Business model (just the stock price:^) Though I doubt they would only have licensing-only Business model. I could be wrong. I do not know anymore about TI's Full Rate G. Lite than I have mentioned, but it sounds GREAT! I was going to write a paper on both G.DMT and G.Lite. Due to workload I would not be able to complete it for a few weeks, so here's a very Short Version. The International Telecommunications Union (ITU) has issued recommendations for asymmetrical digital subscriber line (ADSL) equipment based on discrete multitone (DMT) technology. So both Full Rate ADSL (G.DMT) and G.Lite are both based on the DMT Line Code and TI/Amati should be getting licensing revenues from Amati's DMT intellectual property. The two key recommendations are G.DMT and G.Lite. 1. G.992.1: Asymmetrical Digital Subscriber Line (ADSL) Transceivers, G.DMT 2. G.992.2: Splitterless ADSL Transceivers, G.Lite G.DMT or G.992.1 specifies the characteristics of the ADSL interface to twisted-pair loops. G.992.1 supports a minimum 6.144-Mbps downstream and 640-kbps upstream net data rate G.Lite or G.992.2 specifies the physical layer characteristics of splitterless ADSL. G.992.2 supports a maximum 1.536-Mbps downstream and 512-kbps upstream net data rate. Asynchronous transfer mode (ATM)-only transport. G.DMT has the option to allow for data transmission using bit serial synchronous transfer mode (STM) as an alternative to ATM cell transport. G.Lite specifies the sole use of ATM cell transport. The G.Lite Splitterless approach is a radical departure from the G.DMT specification. For G.DMT the functions of the splitter are: 1.)To protect the ADSL signal from plain old telephone service (POTS) nonlinearity and impedance changes, on/off hook, dial tone, ring-trips, home wiring, and electromagnetic interference (EMI). 2) To protect POTS from ADSL tones and intermodulation of ADSL tones into the POTS audible range. 3) To present known termination impedance to the ADSL transceiver unit (ATU). With the G.Lite version of ADSL service, the modem & POTS operate together on the same internal home wiring. Combined on the same in-house wiring creates the greatest potential for difficulty with G.Lite. By not installing a POTS splitter, the termination impedance will vary from home to home, based on the all the different variations home wiring configurations and the number of phones. The impedance of a telephone going off the hook may be so low that it essentially shunts the strength of the ADSL signal. Nonlinearity of POTS handsets can convert voice signals to a modulated high-band signal that results in interference on the modem. Kinda sounds like my old DMT Vs CAP arguments, doesn't it! IMHO the flexibility of the DMT Line code allows for handling some of the problems, if you Know Your DMT! The BandAid Approach Another way to cure some of these problems, is to use a distributed splitter approach is another option for obtaining a usable link. This involves shipping the ADSL modem with a number of small, in-line POTS splitters, which the customer plugs into each telephone in the house. This would provide protection, and addresses a number of the challenges associated with splitterless ADSL. While putting a BandAid on problem might take care of some the problems, it causes another set of problems. These include: 1. Difficulty in the installation of wall-mounted phones. 2. The reduction of ADSL performance (due to having all those of filters in parallel). 3. For manufacturers, the decision on how many filters to ship with each modem. BandAid approach #2 for the splitterless environment which IHMO is more likely to happen, is using Fast Retrain. Fast retraining allows G.Lite to compensate for electrical changes on an active link without losing the connection (to be sure, some connection interruption will still manifest itself ). Gezzz! All this because the Telco's don't want to do a Truck Roll to install a Splitter outside the home and run a separate twisted pair to your computer. The Telco's are Cheap &$##, and not to smart either! The Telco's could have had the ISP market, yes they could have been an AOL. It has made me very happy to see Companies like QWEST and others come in and turn the Tide on the Telco's. Not very long ago Global Crossing bought Frontier Communications, the Largest backbone provider in the US. All the NET Majors such as Yahoo use Frontier. Now U.S. West has bought Global Crossing! This is a Bandwidth Power House for the world. Enough for now. I Want My G.DMT JW@KSC