Today, there are two types of DSL services that are being offered by the ISPs (Internet Service Providers).
To start off, one is called the ADSL or the Asymmetric Digital Subscriber Line. This is the most popular choice when it comes to home and business internet services. Why? Due to it is commonly known that most of us use the internet to watch music videos, browse and download photos of the latest designer bags, etc.
The reason why it being regarded as "asymmetric" is because the bandwidth is not equally divided for the two directions of data. There is a greater capacity to download rather than upload. This is because most of its bandwidth is allotted for the "downstream" direction. This the place wherein data is sent from the internet to the computer.
The subcribers are given a higher capacity to download almost anything from videos to 3d graphics. They are capable to download big files at a faster speed. As a matter of fact, this type of broadband service is highly recommended for those who have a significant need for graphics and other multi-media intensive web data.
Normally, the internet users are given up to a standard 8mbps for their downloads. On the other side of the coin, a smaller portion of the bandwidth is allocated for the "upstream" or uploading of data. This time, the computer sends the data from the computer to the web. Subscribers are given only up to 640 kbps for uploading. As a result, a slower speed when uploading files, most especially large ones, as compared to downloading the same file. For the majority of the subscribers, this may not pose as a problem since most of them download more than they upload.
In similar way, it can carry or deliver voice. ADSL is the one supporting the POTS or Plain Old Telephone Service. There is a small portion of that is devoted and accommodates voice since it doesn't encompasses the entire bandwidth. You are allowed to make calls without using a separate telephone line.
The other type is the SDSL or the Synchronous Digital Subscriber Line. The difference between this and the ADSL broadband is that it supports symmetric service. Provision of a more versatility for the subscriber is rendered by this type. The capacity of both the upstream and downstream directions is same and equal. You can download and upload various sizes of files or data at the same speed since this type of service can carry from 160 kbps to 1.5 mbps. Consequently, it does not support POTS since all of its bandwidth has already been used.
Putting all together as one, the major advantage of the ADSL is its high speed downloading features and the ability to simultaneously use the DSL and a telephone line. On the other side of the coin, if you have requirements for uploading as much as downloading; you may take into consideration the SDSL.
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