Dsl Technology and Networking

Digital Subscriber Line

DSL is a broadband technology that delivers higher speed data links of up to 24Mbit/s across existing copper wire telephone lines on the "last few kilometers " between the local telephone exchange and the customer premises. It works by using a frequency splitter device to split a traditional voice telephone line into two frequency bands; one narrow one for voice, the other much wider for data, thus creating an DSL enabled line which can be used concurrently for phone conversations and high speed Internet access. The equipment required at the Exchange end of your DSL line is known as a DSLAM (Digital Subscriber Line Access Multiplexer).

There are two categories of DSL he first one is ADSL (Asynchronous Digital Subscriber Line) which has faster download speed than upload, because this is designed for web browsing where most of the data transmission is download and the second one is SDSL (Synchronous Digital Subscriber Line) has the same speed in both directions. This is best for networking computers over VPNs and providing services such as web-site hosting

Explain the types of DSL

1. Asymmetric DSL (ADSL)

This type of DSL connection gives the consumer more bandwidth when it comes to downloading as compared to uploading. Because of the reduced upload rate, Internet service providers are able to offer greater bandwidth in terms of downloading. This technology is best used by residential customers since they normally use more bandwidth for downloading. The normal rate for downloading is at 5 Mbps and 1 Mbps when uploading. Examples of Asymmetric DSL are: RADSL, VDSL and ADSL/G. Lite.

• RADSL (Rate-Adaptive DSL) - is an ADSL technology from Westell in which software is able to determine the rate at which signals can be transmitted on a given customer phone line and adjust the delivery rate accordingly. Westell's FlexCap2 system uses RADSL to deliver from 640 Kbps to 2.2 Mbps downstream and from 272 Kbps to 1.088 Mbps upstream over an...