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Return To Broadband FAQ Archive   Search the Archives What are ADSL, IDSL, HDSL, and SDSL? Answered By Brayden Eckles, Editor ADSL or Asymmetric Digital Subscriber Line has data rate that range from 544 kbps up to 6.1 Mbps in downstream basis while in upstream basis it goes to about 16 up to 640 Kbps. The distance limit of ADSL for 1.544 Mbps is about 18,000 feet, for 2.048 Mbps is 16,000 feet, for 6.312 is 12,000 feet, and for 8.448 is 9,000 feet. Normally, ADSL is used for internet access, downloading music and video, and local area networking. IDSL or ISDN Digital Subscriber Line is somewhat an application of a wrong name of DSL modem since DSL is familiar to ISDN information rate and service that to about 144 Kbps. IDSL with its symmetric function is best when traveling up to 6 miles, however, IDSL is not given by ADSL providers. With similarity to ISDN, the data increases to 144 kbps by sing control channels. HDSL or High bit-rate Digital Subscriber Line is the first version of DSL that will be used for wideband transmission within the business place and between communication provider and subscriber. The main feature of HDSL its symmetrical function in which a same quantity of bandwidth is accessible in both directions. SDSL or Symmetric Digital Subscriber Line is the same as HDSL, however, it only have a single line that carries 1.544 Mbps in U.S. and Canada or carries 2.048 Mbps in Europe that flow in each direction on the duplex line. keywords: Broadband | High Speed Internet | Internet Access | ADSL | IDSL | HDSL | SDSL Aol Broadband Wireless

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