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据最近的调查结果表明，ＩＳＤＮ（综合业务数字网）调制解调器（ｍｏｄｅｍ）是使用最广泛的数字调制解调器技术。虽然许多网络管理者宁愿用ＤＳＬ（数字用户线）或线缆而不愿用ＩＳＤＮ，但是由于可用性的缘故，人们终于归向ＩＳＤＮ。预计今后两年对ＩＳＤＮ的热度一般，而?
According to recent surveys, ISDN (Integrated Services Digital Network) modems are the most widely used digital modem technology. Although many network managers prefer to use DSL (Digital Subscriber Line) or cable rather than ISDN, people are finally relegated to ISDN due to availability. ISDN heat is expected to be normal in the next two years, while?