Does DSL Work Over The Existing Public Switched Telephone Network (PSTN)?
No. DSL is a local loop transmission technology that can be provisioned over the existing local loops, either central office to service user or point-to-point in campus environments. DSL can be optionally configured to operate concurrent with the existing Plain Old Telephone Service (POTS). However, DSL does not traverse the PSTN. DSL-based services are redirected to a high speed backbone network prior to interfacing with the switched network. • What Is A DSLAM? To interconnect multiple DSL users to a high-speed backbone network, the telephone company uses a Digital Subscriber Line Access Multiplexer (DSLAM) located at a central office. A DSLAM, receives signals from multiple customer Digital Subscriber Line (DSL) connections and puts the signals on a high-speed backbone line using multiplexing techniques. Typically, the DSLAM connects to an Asynchronous Transfer Mode line (ATM) that can aggregate data transmission at gigabit data rates. At the other end of each transmission, a DSLAM d
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