High bit-rate Digital Subscriber Line

High bit-rate Digital Subscriber Line

(communications, protocol)(HDSL) A form of Digital Subscriber Line, providing T1 or E1 connections over twoor three twisted-pair copper lines, respectively. Unlikemost other forms of DSL HDSL is not a typical consumerservice, it's used mostly to replace traditional T1/E1connections, such as connecting PBXes to telco offices.The advantage of HDSL over the Alternate Mark Inversion linecoding scheme traditionally used on T1/E1 lines is that itrequires about an order of magnitude lower bandwidth to carrythe same traffic.