Annotated edit history of
HDSL version 5, including all changes.
View license author blame.
| Rev |
Author |
# |
Line |
| 1 |
DanielLawson |
1 |
[Acronym] for __H__igh Data Rate __D__igital __S__ubscriber __L__ine |
| |
|
2 |
|
| |
|
3 |
[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. |
| |
|
4 |
|
| |
|
5 |
[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. |
| 4 |
DanielLawson |
6 |
|
| 5 |
DanielLawson |
7 |
-- Taken from "Data and Computer Communications" - William Stallings - 6th Ed, ISBN:0130863882 |
| 1 |
DanielLawson |
8 |
|
| |
|
9 |
See [SDSL], [DSL] |
| 2 |
DanielLawson |
10 |
|
| 4 |
DanielLawson |
11 |
---- |
| |
|
12 |
|
| |
|
13 |
CategoryNetworking |
