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Zhighway.net offers Asymmetric Digital Subscriber Line (ADSL) Symmetrical. Digital Subscriber Line (SDSL) and RADSL. ADSL is asymmetric, meaning that the downstream data transmission rate is higher than the upstream rate. SDSL is symmetric, meaning the downstream and upstream data transmission rates are the same. RADSL is adaptive DSL which supports speeds up to 7.1Mpbs. One distinctive advantage of DSL is that it delivers broadband communications.