Single-line digital subscriber line (SDSL) SDSL is a symmetric DSL technology, with HDSL only difference is that the use of a pair of copper wires.是什么意思_Single-line digital subscriber line (SDSL) SDSL is a symmetric DSL technology, with HDSL only difference is that the use of a pair of copper wires.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句