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Definition of "Symmetrical Digital Subscriber Line" |
In the wider sense it is a collection of Internet access technologies based on DSL that offer symmetric bandwidth upstream and downstream, including IDSL, HDSL, HDSL2, G.SHDSL, and the SDSL variant below. It is considered the opposite of asymmetric digital subscriber line technologies where the upstream bandwidth is lower than the downstream bandwidth. / Local Central Office Local Exchange is the term for a public telephone company in the U.S. that provides local service.LEC companies are also sometimes referred to as telcos.A local exchange is the local central office of an LEC. |
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