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| Newer page: | version 5 | Last edited on Friday, March 12, 2004 6:45:10 pm | by DanielLawson | |
| Older page: | version 4 | Last edited on Friday, March 12, 2004 6:38:38 pm | by DanielLawson | Revert |
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[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.
+-- Taken from "Data and Computer Communications" - William Stallings - 6th Ed, ISBN:0130863882
See [SDSL], [DSL]
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CategoryNetworking
