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Non-Tech : Amati investors
AMTX 1.600+3.9%Nov 21 3:59 PM EST
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To: bill c. who wrote (20135)6/21/1997 5:55:00 PM
From: JW@KSC   of 31386
 
Bill c. [ BT Line Code ]

To answer one of your questions BT is DMT! How many times does it have to be posted?

I dislike the fact, that facts are given to support an issue, yet the questions reappear over and over by people who have been on this thread a long time, And I can only conclued that this is done to continously cast doubt and confuse the issues. SCTFSO

I have posted the URL for my Why DMT Post many times and the Main Reference Source is clearly stated.

British Tel was instumental behind setting DMT as the ETSI standard.

Some here wonder why I get irriated from time to time, this post may give them a clue.

Primary Reference Source
The BT Technical Journal vol 13 No 4 October 1995
"Broadband multimedia delivery over copper"
by G. Young, K.T. Foster and J.W. Cook

This document contains a summation of only a fraction of the BT Technical Journal article on " Broadband multimedia delivery over copper"
techstocks.com

Jump over to BT's Web Site and request a copy if you don't beleive my word. This document is not on the WEB...
JW@KSC

The following is quoted from BT Technical Journal article on " Broadband multimedia delivery over copper"
DMT Vs CAP

1. DMT's ability to adaptively shape the Allocation of information and transmit power across a given bandwidth enables it to better approach optimum performance than is theoretically possible with CAP/QAM

2. The complex startup procedure required for DMT could result in longer activation times than is possible with CAP/QAM

3. DMT offers greatest performance advantages over CAP/QAM at high transmission rates --- the shorter loops at higher rates have more usable bandwidth giving DMT a greater degree of freedom ( more usable sub-channels for flexible adaptation.

4. DMT is more adept than CAP/QAM at coping with multiple RF interferes

5. It is simple for DMT to meet an arbitrary transmit power mask specification to meet spectral compatibility requirements.

6. echo- cancellation in DMT is non-trivial

7. DMT has greater inherent immunity to impulsive noise than CAP/QAM

8. CAP/QAM can use a simpler forward error correction than DMT

9. DMT requires minimal equalization with slower signal processing rates than CAP/QAM DMT hardware can be more easily programmed to support a variety of upstream and downstream data rates with potential for on-line configuration.

10. DMT need be no more complex to implement than CAP (in terms of signal rocessing MIPS per area of VLSI real estate), although it may be more complicated to understand and design, in particular the Startup sequence.

11. DMT has the potential for more sophisticated embedded line monitoring functionally (e.g. for cable sheath management).
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