There are several different types of DSL, the digital subscriber line technology that takes advantage of copper telephone lines to transmit high speed Internet service. The various types of DSL generally vary with regard to the speed in which information is downloaded or uploaded, with some types of DSL a better fit for individual users and others a better fit for businesses. There are two different types of DSL, although there are variations of each.
- Asymmetric DSL. This is the type of service that most individuals have at their homes when they subscribe to DSL from the phone company. That’s because the main distinction with ADSL, as it is referred to, is the greater bandwidth when it comes to downloading information. In most ADSL systems, the download rate is 5 Mbps as opposed to 1 Mbps or even less to upload information. Since the normal high speed Internet user is concerned with the speed and amount of information that can be downloaded, ADSL is marketed and most popular with home users. ADSL makes it possible for individual users to transfer movie, audio and 3-D images, while still retaining enough capacity downstream so the customer can talk on the phone while also surfing the Internet.
- Symmetric DSL. Instead of providing greater bandwidth for downloads, symmetric DSL, or SDSL, offers similar speeds for both uploads and downloads. This is the most popular type of DSL for companies, which have a greater need for upload, as well as download transfer of data. Generally speaking, SDSL is more expensive than ADSL. There are a couple of offshoots of SDSL: HDSL, which is high data rate DSL and VDSL, which is very high data rate DSL.
Why Use ADSL or SDSL
The main benefit of digital subscriber line technology is that it’s a major step forward over dial-up service. DSL offers customers the ability to separate voice and data transmissions so it’s possible to talk on the phone while spending time online on the computer. The main benefit of different types of DSL is for providers to offer the type of service most desired by users. If the demand is for download speed, then the best product is ADSL. For users who download and upload information, SDSL is a more sensible product. However, no matter which is chosen, the further a customer is located from a central DSL officer, the more potential problems with the Internet connection. This is not an issue faced by broadband service, though DSL has the advantage of generally being less expensive than broadband high speed Internet.