December 1999
Beginner to intermediate
416 pages
11h 31m
English
Content preview from Residential Broadband, Second Edition
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High Data Rate DSL
Although ADSL enjoys considerable hype, High Data Rate DSL (HDSL) is the most widely deployed form of DSL, with more than 1 million lines deployed in North America today. The leading vendor of HDSL equipment, in terms of units shipped to date, is Pairgain Technologies (Nasdaq: PAIR) . Other vendors are Adtran (Nasdaq: ADTN) ADC Telecommunications (Nasdaq: ADCT) ), and Orckit (Nasdaq: ORCT) .
Originally defined by Bellcore, HDSL was created to provide leased-line T1 service to supplant the then-current Alternate Mark Inversion (AMI) modulation scheme. The problem with AMI was that it required frequent repeaters. HDSL was marketed as a repeaterless T1 and saved the telephone companies costs in provisioning ...
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