There’s not much room for more bandwidth in copper wires, so keeping the lines biased toward download is probably for the best. Most DSL is ADSL, where the “A” stands for “Asymmetric,” so the disparity is pretty much baked into the standard. The download and upload streams operate on two different frequencies above the voice frequency, which being fairly high, decay pretty quickly over any distance. It uses the same copper lines that your telephone does, so it’s not exactly built for speed. DSLĭigital Subscriber Line (or DSL) is fairly slow, but it does a decent job of relaying Internet over the last mile or two. It makes sense then to have at least a two-to-one download-upload ratio. During peak times they might max out the coaxial cable’s download bandwidth while leaving the upload channel fairly open. If everyone in an apartment building has fifty Mbps up and fifty Mbps down, all of their data is probably going to one coax cable connected to the building. Asymmetry is actually importantĭSL, cable, and fiber connections need to be divided into different streams for download and upload, and since they all have limits on how much information you can pack into them, privileging download over upload is usually better. Why the asymmetry? In general, ISPs are considering two things: there is a lot more demand for downstream bandwidth than for upstream, and there is a technical limit to how much traffic their lines can carry. Speedtest’s world average for July 2018 was 46.41 Mbps down, 22.48 up.
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