Remember that 5,280 ft equals 1 mile,
Will-
Let me first say I agree completely with John Hunt.
That saved some time, thanks JH.
Remember that 5,280 ft equals 1 mile, so 18,000 ft equals 3.4 miles. ADSL at 1.5Mbps, DMT or CAP, dies out after 3 miles. It is important to understand that at 6Mbps, ADSL will not be available at distances beyond 9,000 to 12,000 ft (1.7 to 2.3 miles), without "repeaters" or DLCs. As speed increases the distance decreases inversely.
I guess it depends on who's complete DMT Package your using? You use those numbers well, mixing CAP in the same breath DMT.. It won't pass here.
As long as your tossing out numbers, how about continuing with the percentage of subscribers within the distances given, i.e. 1000 to 6,000 ft, 6,000 to 12000 ft, and 12,000 to 18,000 ft.
There in lies the key to ones success.
"Allowing for those factors, we realize downstream rates of approximately 8 Mbits/s at line distances to 1.5 miles; 6 Mbits/s to distance of 2.5 miles; 4 Mbits/s to distances of 3.5 miles; and 1.5 to 2 Mbits/s at distances of 3.5 to 5 miles.
The highest data rates-8 and 6 Mbits/s, up to 2 or 2.5 miles-allow super-fast Internet connectivity at nearly 500x voiceband-modem speeds, while simultaneously allowing some of that speed to be used for broadcast digital television-of higher quality than is available conventionally-or for receipt of several VCR-quality video-on-demand movies. At the longer line lengths (about 20 percent or less of the existing phone lines), only very fast Internet or VCR-quality video is possible."
Quoted from EE Times
January 20, 1997, Issue: 937
Section: Communications Design
ADSL modems speed infobahn access
By John M. Cioffi, Chief Technology Officer, Amati Communications Corp., San Jose, Calif.
techweb.com
Amati is also working future versions with twice the bandwidth 2.2Mhz by increasing the number of tones to 512, and realizing 10Mbps in shorter loop lengths, this too, increases the upstream bandwidth as well. I posted JC's article discussing this not to long ago, perhaps someone has it handy if you need it, me, I'm to tired.
Good Night
JW@KSC |
