Which public WAN access technology utilizes copper telephone lines to provide access to subscribers that are multiplexed into a single T3 link connection?
- ISDN
- DSL
- cable
- dialup
Explanation: Digital Subscriber Line (DSL) is a high-speed WAN technology that utilizes existing twisted-pair copper telephone lines. In a typical deployment, the provider uses a DSL Access Multiplexer (DSLAM) at the Central Office to concentrate and multiplex signals from multiple DSL subscribers into a single high-capacity backhaul connection, such as a T3 link or an optical fiber, to connect them to the internet.
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