View Source: DSL - Waikato Linux Users Group

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[Acronym] for __D__igital __S__ubscriber __L__ine

There are several types of DSL around, although only [ADSL] and [SDSL] are readily available in New Zealand.

Not many people are aware but Telecom is extensively selling [SDSL] to businesses when they order Ethernet connectivity and fibre to the premises are unavailable, they only need up to 2 Mbps or there will be a delay with getting higher speed product available. It is not sold as [SDSL] but called other names as Telecom starts to demphasie FrameRelay.

| |[ADSL]|[HDSL]|[SDSL]|[VDSL]
|Bits/second| 1.5 to 9Mbps downstream, 16 to 640 kbps upstream | 1.544 or 2.048 MBps | 1.544 or 2.048 Mbps | 13 to 52 Mbps downstream, 1.5 to 2.3 Mbps upstream
|Mode|Asymmetric|Symmetric|Symmetric|Asymmetric
|Copper Pairs|1|2|1|1
|Range (24-guage UTP)|3.7 to 5.5 km|3.7km|3.0km|1.4km
|Signaling|Analog|Digital|Digital|Analog
|Line code|CAP/DMT|[2B1Q]|[2B1Q]|DMT
|Frequency|1 to 5 MHz|196kHz|196kHz|10MHz
|Bits/cycle|Varies|4|4|Varies

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

See also: [ADSL2]

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CategoryNetworking

11 pages link to DSL:

Last edited on Friday, March 18, 2005 4:47:57 pm by IanMcDonald

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