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To: SteveG who wrote (55)	2/19/1999 2:25:00 PM
From: SteveG	Respond to of 1658

<...Siemens AG, which has been focusing on multiple-rate symmetrical DSL services, presented two papers on new DSL devices. A group under Michael Moyal has developed a single-chip CMOS 768-kbit/s transceiver capable of carrying data on single-pair copper loops out to 25,000 feet. Another group at Siemens has developed a hybrid device that uses an independent analog adaptive-balancing filter for more effective echo cancellation...> (From 2nd link) Comments: 25 kft and 768 kbps in any reasonable noise environment is probably out of the question, using fundamental theoretical considerations (Shannon theory of the basic, underlying channel). The siemens chip is rate adaptive, and it's likely that the reach is at a lower rate, or in a very clean (lab, not real-world) environment.

To: SteveG who wrote (55)	2/20/1999 1:50:00 PM
From: Bernard Levy	Read Replies (3) \| Respond to of 1658

* OT ** Hi Steve: Thanks for recalling my positive views on VDSL. It's funny that BRCM and TXN are using ISSCC as a backdrop for their battle on QAM versus synchronized DMT for the T1E1 VDSL standard. Of course, each company is trying to put its best foot forward (BRCM by its emphasis on pure DSP implementations, and TXN with the use of an analog front end). By the way, although Frank C. on the Last Mile thread seems currently enamored with FTTH, I think his earlier thesis that local loop architectures for cable/DSL/wireless would converge is correct. Within this context, because it involves short distances, and offers a very high dedicated capacity, VDSL will be a powerful contender. The ISSCC had a lot of other good discussions (look at the software versus hardware debate, and the Klaas Bult talk on the effect of scaling on analog A/Ds) Best regards, Bernard Levy