Complete Protocol dictionary, glossary and reference

HDSL4: 4th generation HDSL

HDSL4, the 4th generation HDSL (High Data Bit Rate Digital Subscriber Line), is an enhanced version of HDSL2 which achieves about 30% greater distance than HDSL or HDSL2 by using two pairs of wire (thus, 4 conductors), whereas HDSL2 uses one pair of wires.

Standard Organization

ATIS

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