Dsl Modem
Dsl (Digital Subscriber Line)
DSL (Digital Subscriber Line)
DSL(Digital Subscriber Line) is a technology that enables to use the unused bandwidth that already exists on a regular phone line to deliver fast digital data transmission without affecting the analog telephone service used. DSL, which also commonly known as xDSL or ADSL, uses ordinary copper telephone wiring to deliver a high-speed, downstream (from the Internet to your computer) channel to subscribers and a lower-speed, upstream (from your computer to the Internet) channel to the network while at the same time providing POTS ( Plain Old Telephone Services).
DSL technology has added a new twist to the utility of telephone lines. Telephone lines, which were constructed to carry a single voice signal with a 3.4 kHz bandwidth channel, can now convey nearly 100 digitally compressed voice signals, or a video signal with quality similar to broadcast television.
DSL technologies increase the information-carrying ability of traditional copper wires. DSL enables high-speed multimedia services such as video-on-demand, Internet access, distance learning, remote corporate LAN access, and videoconferencing for anyone with access to a clean copper line.
ADSL is able to convert the existing information system network from one limited to voice, text, and low resolution graphics to a powerful network that can deliver multimedia to everyone’s home or small business. Implementation of ADSL is quick at up to 1.5 Mbits/s and 512 kbits/s upstream. That’s about 30 times faster than today’s analog modems.
How does DSL work?
DSL allows for greater bandwidth by utilizing more of the bandwidth available on a common analog line and connecting digitally on both the uplink and downlink connection.
DSL modems can provide downlink connection speeds greater than 6 Mbps and uplink speeds of 640 Kbps, or as much as 1.1 Mbps in both directions.This makes DSL not only much faster than 56K analog modems, but also faster than ISDN and rivaling cable modems in bandwidth. This allows phone companies to compete with Cable Internet Service Providers. Because many of the expected applications for DSL involves digital, compressed video, forward error correction is employed to reduce impulse noise error with symbol-by-symbol error correction to counteract continuous noise.
DSL is not a bus-related technology like analog or cable modems. With DSL, bandwidth rates available are more consistent to the end user. There is a geographic requirement that the end user must be within 18,000 feet of the central office or signal degradation will become too great and DSL unfeasible.
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