SDSL


Symmetric Digital Subscriber Line is commonly known in the industry as "Naked DSL", or "SDSL" service. Unlike ADSL, SDSL does not require you to have an existing phone line with your local telephone company or subscribe to analog telephone service. SDSL uses the same copper wires that are normally used for making voice telephone calls. However, SDSL lines are completely dedicated to carrying broadband data for Internet connectivity.

ADSL


Asymmetric Digital Subscriber Line, or ADSL, is a broadband service that requires you to have an existing (residential) analog phone line at your location. ADSL uses the existing copper wiring from your local telephone company to carry its broadband signal directly to your home. You must be within approximately 15,000 feet of your local telephone company's nearest Central Office in order for ADSL service to work at top speeds. In some cases, this can be extended to 20,000 feet or more, albeit at slower speeds. ADSL will not affect your regular telephone service in any way.

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Broadband Speed Tests


DSL (Digital Subscriber Line) broadband connections are common, with the asymmetric version of the technology implemented readily by home broadband customers because of the high download speeds offered which are considerably faster than the upload speeds possible.

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Meanwhile businesses and large organizations are more likely to use symmetric DSL (SDSL) connections as they offer upload speeds which are equal to download speeds. DSL typically operates over existing copper landline telephone connections and because it uses a higher frequency band than home phone services the two can operate in unison without interference.

DSL download and upload speeds are often advertised by providers as being capable of achieving `up to` a certain amount in megabits per second (Mbps). However, this is often reliant on the theoretical maximum speed attainable using the technology and in real life your download and upload speed could be very different due to a number of factors. Some are within your control, while others are not and determining whether your broadband connection is fast enough for your needs, or if there is an issue with the service is only possible thanks to broadband speed tests.

Broadband speed tests are simple procedures that you can run from any web browser on your PC at home. You just need to visit a website offering one and then click a button or link to begin the test. At first the speed test site will transfer a small, benign file from its servers over to your computer and you should be able to check on screen to see how fast the transfer is taking place. This will give you an exact figure for your real-life download speed. Then the process will be repeated, but in reverse, so that a file is sent from your PC to the speed test site`s servers and the upload speed can be recorded.

With the results of a broadband speed test at hand, you can easily compare your current broadband package with the alternatives offered by other providers, or even look to other technologies. You can also send the results to your current provider if you are experiencing any issues that you believe can be resolved in this way and having evidence of an abnormally slow connection is often the quickest way to get a response and fix the problem.

DSL broadband connections can have their speed impacted by a variety of things. For example, the distance between your property and the local telephone exchange is often the biggest factor in determining how fast your connection will be. The further away you are, the more the digital signal deteriorates and the slower the maximum attainable download speed will be. One alternative might be to look at mobile broadband deals, but again the issues of your location in relation to the nearest 3G base station will hamper your connection speed. For a more consistent speed broadband connection you might consider a cable broadband service. These use fibre optic technology, which unlike copper cabling does not suffer the same signal deterioration over long distances and can provide download speeds of up to 50Mbps. The one problem with Cable broadband is that it covers a much smaller area of the country than DSL.

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