CenturyLink speed test

CenturyLink DSL is typically sold at 10, 20, 40, 80, 100 or 140 Mbps depending on how far you are from the equipment, with uploads commonly 1–20 Mbps. DSL is distance-sensitive, so a wired result at 80–90% of the advertised speed is normal and the connection should read the same at midnight as at 8 pm. Fibre plans run 200 Mbps to multi-gigabit and are symmetrical.

DSL itself doesn't slow with the time of day — the copper line gives a fixed sync rate. Evening drops usually mean congestion further back at CenturyLink's aggregation point, or Wi‑Fi interference from neighbours. Leave the monitor running for a day: a flat line that dips 7–11 pm is a complaint-worthy pattern; random dips at any hour point at Wi‑Fi or a noisy phone line.

Log in to the modem (often 192.168.0.1) and look for the DSL status page. SNR margin under about 6 dB, high CRC error counts, or frequent re-syncs mean the line is marginal. Unplug every other phone device, use a DSL filter, and try the modem on the first jack where the line enters the house.

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