(ADSL is a transmission technology that uses copper telephone lines as the transmission medium, and adopts frequency division multiplexing (FDM) technology. Its uplink (user to exchange) and downlink (exchange to user) rates are asymmetric, and the downlink rate is usually designed in Between 1.5Mbit/s and 8Mbit/s, while the uplink rate is between 640kbit/s and 1Mbit/s, the corresponding maximum transmission interval is 5.5km, which is suitable for Internet services with a large amount of downlink data.)
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