ADSL stand for asymmetric digital subscriber line, here asymmetric means data speed does not same in both directions (upload and download) and provides high speed on already exiting telephone lines and same time you can use internet and as well as your line for phone.
It is faster than DSL and but ADSL downstream speed (downstream rate ) is different with upstream speed (sending rate ). ADSL is much easier to install and provides much faster data transfer rate. ADSL support data upstream rate is 16 Kbps to 640 Kbps and data downstream rate is 1.5 to 9 Mbps. Normally ADSL and download and upload speed is averagely 10 time more than a normal dial up connection.
Your DSL connection to the Internet will always on, there is not need to dial your ISP each time to use internet and the main requirement for ADSL connection is modem. There are many option in modem hardware for example: USB ADSL Modem, PCI ADSL Modem, and ADSL Router, but mostly used USB Modem because easy to install.
For 1 or 2 computer the USB modem is best but for more than 3 computer you should use Ethernet ADSL modem. ADSL connections are more useful in applications like videoconferencing, to run online movies and upload and download heavy files. This connection is ideal for today business requirements.
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