Which public WAN access technology utilizes copper telephone lines to provide access to subscribers that are multiplexed into a single T3 link connection?

The public WAN access technology that utilizes copper telephone lines to provide access to subscribers and can be multiplexed into a single T3 link connection is DSL (Digital Subscriber Line). DSL technology uses existing copper telephone lines to provide high-bandwidth data communication for subscribers. It allows for data and voice to be transmitted simultaneously, which is why it can be used alongside regular telephone service.