| ADSL stands for asymmetric digital subscriber line. | | | | One of the significant parts of ADSL technology is |
| It is a type of DSL broadband internet connection | | | | represented by ADSL modem. This modem |
| technology. One of its great achievements is | | | | provides a popular and cost effective solution for |
| more quantity of data which can be sent to | | | | end users. It enables the data transfer directly to |
| already accessible copper telephone lines. They | | | | the personal computer of the user. The cost of |
| depict an advanced form of traditional modem | | | | this modem varies according to the user's |
| lines. The hunger of the end-users for fast surfing | | | | demand for the speed variations in the server. |
| speed of internet has led to many inventions in | | | | There are many options with the variations of |
| this modern time. ADSL modem is a perfect | | | | upstream and downstream frequencies according |
| example to represent one of those inventions. | | | | to the capabilities and location of the users. The |
| There is a specific attachment of a special filter | | | | minimum available configuration is 1.5 Mbps and |
| connected to the user's telephone line which | | | | maximum is 8 Mbps. There is another in-between |
| enables both ADSL and genuine telephone | | | | configuration of 6.1 Mbps along with 64 Kbps |
| services to be run in synchronization. This special | | | | duplex. |
| filter is called micro filter. | | | | ADSL modem is basically of three types. These |
| The construction features of an ADSL calls for | | | | three types are Ethernet, PCI and USB. The main |
| the services of subscribers and ADSL modem | | | | advantage of ADSL modems that it can easily |
| which should be kept in close geological vicinity to | | | | create multiple channels in order to transfer the |
| the internet service provider's central office. This | | | | data. For this, the ADSL modems divide the |
| is mandatory to avail the best services that | | | | bandwidth available in two different ways - Echo |
| people can attain from the asymmetry of the | | | | cancellation and Frequency Division Multiplexing |
| digital subscriber line. The distance between the | | | | (FDM). The FDM, Frequency Division Multiplexing |
| ISP office and subscriber should be in a radius of | | | | assigns 1 band for the upstream data while |
| maximum 2.5 miles. The upstream rate of ADSL | | | | another for downstream data. So, it can be said |
| is 16 to 640 Kbps and its downstream rate is 1.5 | | | | that in spite of such balanced capabilities of ADSL |
| to 9 Mbps which makes it preferable over all the | | | | modem, the internet users who use modems |
| other connections available in end user's close | | | | should not be frightened with technological |
| proximity. | | | | capabilities of modem. |