View Source: HDSL - Waikato Linux Users Group

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[Acronym] for __H__igh Data Rate __D__igital __S__ubscriber __L__ine

[HDSL] was developed in the late 1980s by BellCore to provide a more cost-effective means of delivering a T1 data rate (1.544 Mbps). The standard T1 line uses alternate mark inversion ([AMI]) coding, which occupies a bandwidth of about 1.5 MHz. Because such high frequencies are involved, the attenuation characteristics limit the use of T1 to a distance of about 1km between repeaters. This, for many subscriber lines one or more repeaters are required, which adds to the installation and maintenance expense.

[HDSL] uses the 2B1Q coding scheme to provide a data rate of up to 2Mbps over two twisted pair lines with a bandwidth that extends only up to about 196 kHz. This enables a range of about 3.7km to be acheived.

-- Taken from "Data and Computer Communications" - William Stallings - 6th Ed, ISBN:0130863882

See [SDSL], [DSL]

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CategoryNetworking

4 pages link to HDSL:

Last edited on Friday, March 12, 2004 6:45:10 pm by DanielLawson

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