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ADSL(Asymmetric Digital Subscriber Line)即不对称数字用户线,它通过不同的调制方法,在钢缆上实现高速数据传输,其上行速率为640kbit/s,下行速率为8Mbit/s。 ADSL技术在实际应用中采用电话线传送高速数据,由于ADSL频带与POTS(传统电话业务系统,4kHz频带)业务已经分开,因此不会影响正常的电话业务,从而可经济、方便地为用户提供高速Internet、VOD、可视电话等宽带业务,并保持现有用户分配网络不需做变动。
Asymmetric Digital Subscriber Line (ADSL), an asymmetric digital subscriber line, achieves high-speed data transmission over a steel cable by different modulation methods, with an uplink rate of 640 kbit / s and a downlink rate of 8 Mbit / s. ADSL technology in the practical application of high-speed data transmission using the telephone line, as ADSL band and POTS (traditional telephone service system, 4kHz band) business has been separated, it will not affect the normal telephone service, which can be economical and convenient to provide users with high-speed Internet, VOD, videophone and other broadband services, and to maintain existing users do not need to make changes to the distribution network.