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How to find nearest DSLAM, speed vs distance for VDSL2

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I'm looking at some land for sale in Paulden, AZ, and high-speed Internet access is a critical qualifier. The parcel does not yet have a street address. One existing house about 1000 ft from where I would build qualifies for 40Mbps down/5Mbps up, and I was told by one of their engineers that there is a FTTN cabinet somewhere nearby. However they could not tell me where that node actually is, so I don't know if my home would be closer to it or farther from it, compared to the existing house (but most likely farther!). Also I am on the opposite side of the street from that house, and another existing house that is on my side of the street, but closer to me, only qualifies for 1.5 Mbps according to what they tell me when I call in to request service. I've used their online "qualification" app to check over a dozen house addresses in the general area, and while many come up as "invalid address" (even though they are clearly existing homes on the Yavapai County GIS map), there are several showing 40/5, some showing 20/2, but no pattern that I can discern. The engineer I spoke with says he cannot help me further until I have an actual street address assigned to my lot. So I called Yavapai county but it turns out due to questions about the actual access route, they may need to assign a new street name, which will take three or four months. I could calculate a reasonable guess for an address that would work out to the correct distance based on my location, but I think he needs an actual assigned address to stick in his database to get the ball rolling. Realizing new utility trenches must be installed anyway to reach the new parcel, I'm thinking the real question involves my distance from the fiber-fed DSLAM. Is there any department at CenturyLink I can call to find out where the actual DSLAM is located? Then I could easily calculate actual trench distances to my proposed home location. Finally what is the rule of thumb for speed vs distance, for VDSL2 (that is what CL told me is available from the fiber-fed node)? Keep in mind this would be mostly new wiring, depending on where the nearest loop connection point might be (probably one of the neighboring home locations on the road out front). The whole neighborhood was built out in the last 12 years or so.

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