Which Internet connection type, used to be popular for household usage, provides uneven download and upload speeds and is delivered via standard phone lines?

Although some providers are abandoning DSL in favor of fiber-optic connections, it remains a viable Internet connectivity option in rural areas where fiber has not yet arrived. DSL uses existing phone lines to give reasonably reliable access while simultaneously transmitting voice and data on the same lines. Most DSL subscriptions are asymmetrical, which means that download speeds are faster than upload speeds. POTS is an abbreviation from dial-up days that stands for Plain Old Telephone Service. Cable TV companies provide cable connectivity. ISDN stands for Integrated Services Digital Network, a now-defunct technology that, like DSL, allowed voice and data connection over the same existing telephone lines.