One thing to keep in mind with dry loop DSL.
While yes you do save money. Don't get me wrong I think it's a novel idea. I support it to the full end of the word. However, and keep in mind, if you are pretty far away from the office, or remote terminal it's better to keep a basic POTS plus DSL. Reason being is for some reason on farther out loops it seems the POTS plus DSL lines are fairing better than the regular dry loop dsl lines. I don't know what it is or why and part of me thinks it might have something to do with the POTS power being on the line, kind of like a carrier.
I have for some change entire DSLAMs, entire ports, entire office wiring, and in the end it seems to come down to the same answer in the end.... it worked better with pots plus DSL. Ironically the minute they order a cheap phone line and line-share with it, it magically starts working again. I also notice these loops when it comes back requires less power as well. One example, that dsl was using 25.5db of power for the entire profile and the best it would achieve was 1480. The minute they put a lifeline line-share on it, Power literally dropped in 1/2 and it was getting full 1536 speeds. This guy I moved him to two different DSLAMs in the office, I lost count on the cable pair changes. Changed every last jumper wire between him and the remote, replaced the drop and had his entire nid and all replaced. Had his modem replaced, had his cords replaced. In the end..... a lineshare and I haven't heard from them since march of this year. They have had no other DSL tickets since that small change.
Only working theory I can think of as to why it works: The POTS signaling is the carrier for the DSL on the longer loops. Something ADSL2/VDSL2 doesn't have to have as they have more bits per channel.--
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Koetting Ford, Granite City, illinois... YOU'RE FIRED!!