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HDSL (High bit-rate Digital Subscriber Line)

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HDSL (High bit-rate Digital Subscriber Line)

Also see our Fast guide to DSL.

HDSL (High bit-rate Digital Subscriber Line), one of the earliest forms of DSL, is used for wideband digital transmission within a corporate site and between the telephone company and a customer. The main characteristic of HDSL is that it is symmetrical: an equal amount of bandwidth is available in both directions. HDSL can carry as much on a single wire of twisted-pair cable as can be carried on a T1 line (up to 1.544 Mbps) in North America or an E1 line (up to 2.048 Mbps) in Europe over a somewhat longer range and is considered an alternative to a T1 or E1 connection.

Related glossary terms: gigapop (gigabit point-of-presence), NBMA (non-broadcast multiple access), ATU-R (ADSL Terminal Unit - Remote), ring, passive FTP, dark fiber, Router, satellite news gathering (SNG), plane (in networking), bus network

This was last updated in September 2005

Posted by: Margaret Rouse

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