What are some of the differences between HDSL technology and the other xDSL technology termed ADSL?

HDSL is a technology using 2B1Q line coding and offering bi-directional data transmission with both upstream and downstream traffic traveling at the same rate. ADSL also offers bi-directional data transmission but the downstream traffic travels faster than the upstream traffic. For example, the user's upstream connection may be at 128 Kbps while the downstream connection would be at 1.5 Mbps.

In certain applications, such as surfing the Internet, the user needs more bandwidth while downloading information from the Internet and therefore the ADSL technology works well. More.

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