ADSL refers to asymmetric digital subscriber line and a kind of DSL broadband internet connection technology. One of its major benefits is excessive quantity of data which can be sent to already accessible copper telephone lines. They display an improved form of conventional modem lines. In order to meet the needs of high-speed internet communication devices, there have been numerous improvements in today�s environment. There is a specific attachment of a special filter connected to the user�s telephone line which enables both ADSL and genuine telephone services need to be run in synchronization. This filter is popularly known as micro filter.

The construction features of ADSL computer modems call for the services of subscribers and ADSL modem which should be kept in close geological area to the internet service provider�s central office. it is imperative to get the best services that subscribers can attain from the lack of balance of the digital subscriber line. The distance between the ISP office and subscriber should be in a radius of maximum 2.5 miles. The upstream rate of ADSL is 16 to 640 Kbps and its downstream rate is 1.5 to 9 Mbps which makes it beneficial as compared to all other internet connections available in the defined vicinity.

The latest ADSL technology is majorly represented by ADSL computer modems. This modem provides a popular and cost effective solution for end users. It enables the faster data transfer directly to the personal computer of the user. The cost of this modem differs depending on the user�s demand for the speed variations in the server. There are numerous options with the variations of upstream and downstream frequencies according to the capabilities and location of the users. The minimum available configuration is 1.5 Mbps and maximum is 8 Mbps.

ADSL computer modems are generally of three types including Ethernet, PCI and USB. The major advantage of ADSL modems is that it can create multiple channels for the transfer of data.

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