技术在快速发展进步。因此，我们建立了易于使用的术语汇编，帮助您更好地了解影响您业务的术语、技术和趋势。
Direction of data traveling from the central office or local-exchange company to the customer premises. In ADSL, the downstream link provides much greater data rates than the upstream link (from customer premises to central office).
