US Telco Support > AT&T > AT&T Southwest > ADSL2+ vs. ADSL speed/distance graph?

ADSL2+ vs. ADSL speed/distance graph?

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The uhhh, search function up on the upper right found me this in just 20 seconds of fishing around.
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So what search terms did you use? I tried several permutations of lightspeed and adsl2 but never did find that topic...

reply to wierdo
I think d_l posted that graph... ask him.

reply to wierdo


Was that it? It was indeed from one of d_l's posts.

That's even better than the one I was looking for. Thanks!

reply to wierdo

That one is actually a bit more optimistic than the one I was specifically thinking of, which was linked in the first reply to this post. That one does show the often overlooked crosstalk problem, which I understand is even a problem currently, just not to the same degree as it will be with the higher frequencies involved in higher bitrate types of DSL.

I had been thinking that it was really a wash, going SBC's way of further expansion of DSL, but then I read someone's point that with FIOS, as an example, the outside plant is completely passive, an advantage over even cable's HFC network. In cases of power outage, this is a significant advantage, especially for people who would be willing to invest in a large UPS to run the CPE. One of the best things about a CO line is the large battery plant and on site generator that keeps the phone service operating regardless of the power company's situation. I could easily run my laptop (or my desktop with a Mobile Athlon and an LCD screen) and the fiber CPE for days on a moderately sized UPS, probably better than a week with not much more effort.

In areas subject to extensive ice storms cutting off utility power for long periods of time, the time an RT can run on batteries alone is not enough.

I wonder if most COs seeing a significant decrease in overall power loads due to the use of digital switches and offloading of much of the OSP power loads to off site utility power have reduced their battery capacity or not.

It'll be interesting to see what speeds I actually end up getting at 7kft, especially if as many of the neighbors as have DSL (which is a lot, judging from the number of 2wire WiFi devices one sees where I live) eventually have the ADSL2+ service.

The only thing that really bugs me about ADSL2+ is the lack of significant upstream bandwidth. That and the probability of not being able to purchase most of the available bandwidth for use as an Internet connection, instead having it segmented off for TV use. Seems to me to be a case of wanting to do too much with too little bandwidth..I like speed.

reply to wierdo
The lack of increased upload speed for ADSL2+ is for Annex A and I believe it is primarily to stay backwards compatible with ADSL. There is Annex M (I think I've got the right alphabet letter there) that allows use of POTS frequencies to boost the upload speeds. Obviously this would have to be a dry loop service.

reply to wierdo

Forgive me, oh search function, for being too specific!