[citation][nom]budtske[/nom]12Mbit/320Kbit subscription, syncs at 9Mbit/320Kbit because of distance to DSLAM.(Belgium, Flemish part)Any users commenting that are on an ADSL/ADSL2(+) or VDSL network should state the speed they sync at, this degrades when increasing the distance to the DSLAM (meaning, total lenght over RJ11 copper telephone wire)[/citation]
budtske, thats basically true for any connection, the further you're out from the node in cable the more errors and the harder time you will have with uploads in a coaxial (cable) connection
for xDSL technologies, its just reported train rates that you see as your copper telephone lines arent RJ11 (thats the jack connection type) most feeder/distribution cables for the Telco's is CAT1+ so you receive alot of interference which create errors as the lack of "twist" in the cable creates interference issues from "crosstalk" or typically interference from other digital and analog data circuits in the same cable (think T1's and ISDN)
Loop length is a misconception that is commonly used as its just easier to the 'laymens' not in the telco industry
the actual issues are bridge taps, loop resistance, and interference. Typically, I have found in my years in the telco industry, its the home wiring that creates the biggest issues as the further out from the DSLAM or RTDSLAM for aDSL or a USAM (fiber node) for VDSL
typically the telco techs and engineers refer to loop length as the defining issue for qualifying aDSL circuit using 15K ft for aDSL and 3K ft for VDSL but as Ive stated before this is a crock, but this just easier for everyoen to use footage
I've personally since loop lengths over 23K ft in cables without interference and cabling that hasnt had many splicing and resplicing issues, typically older cabling that has been spliced creates tons of problems
AT&T's U-Verse and Qwest's VDSL (same thing, just different equipment) is completely different than Verizon's Fios as Fios is a true Fiber to the premise (house) system.
VDSL is a Fiber to a Node or a Hybrid system similar to what the Cable co's use and the higher bandwith and frequencies used as compared to aDSL is even more susceptible ot aDSL's problems, fortunately AT&T is going to or already has started using a 2 pair feed to increase "loop length" ugh theres that term again 😉
Cable has that same problem distance from the node
as the number of amplifiers & cabling resistance typically kills your upload first, and if you're too far you really have an issue as most Coaxial cable that is used is an older 550(ish) MHz rated cable and the typical internet freq is 700MHz um ya it really is rated, but hell you think your cable company is gonna replace it nope, hell most amplifiers arent rated for 700MHz+ either, cheap radio shack splitters that customers like to use because theyre a pretty gold color will cause problems as well, as most arent rated for 700+ MHz and dont have a return path (your upload)
Cable Co's networks are not really designed for uploading as the bottle neck is the frequency that the Modems use to send the signal back to the Node is rather small for bandwidth typically around 54 MHz
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