| By :
Dirik Hameed
High speed internet access is an important requirement for many businesses, though the type of access best suited to one business's needs is not always the best for another business. It is useful to compare business broadband ADSL with business broadband SDSL so that businesses can decide which one is best for their requirements. Symmetric Digital Subscriber Line (SDSL line) offers high speed internet access where the rates of data uploading and downloading are the same. This means that a client machine can send data to and receive data from the internet whilst having the same amount of bandwidth availability in either direction. Asymmetrical Digital Subscriber Line (ADSL) has more bandwidth available for receiving data than it does for sending data. Hosting mail servers and websites, doing lots of videoconferencing and running a virtual private network are all things that may cause businesses to regularly have to upload data. In this case SDSL is very useful as upload speeds can be 7 MB per second, whereas ADSL wouldn't be sufficient as there would not be enough bandwidth for fast uploading since upload speeds are 1 MB per second. SDSL also does not have a monthly usage cap but many business ADSL plans do. Business broadband SDSL uses an entire telephone line to send and receive data through a digital frequency and therefore services like phones and fax machines connected to the same line can't be used as the SDSL takes up the whole line. Therefore a dedicated SDSL line is required if you want to maintain these other services whilst being online. ADSL however allows you to be online and still have the phones and fax machines work without needing a separate line. SDSL works on an "always-on" basis so whenever a computer connected to SDSL is switched on it automatically will be connected to the internet. You need an SDSL modem for SDSL services. The modem is likely to need LAN equipment or DSL chipsets from the same vendor. Business broadband SDSL is not available everywhere and the speeds will differ depending on how far away the SDSL is from the local hub, whereas ADSL generally has wider geographical availability though speeds will also differ in different areas. ADSL is cheaper than SDSL and additionally SDSL usually involves having to take out a contract of at least a year. With ADSL business broadband plans you often do not have to have a year-long contract and instead can change your plan or provider within a short time period if required. If a business does not need to quickly upload large amounts of data and it does not want to take out a year-long contract, then ADSL business broadband is a cheaper, more suitable option. If a business does require the ability to upload lots of data quickly then business broadband SDSL is the better choice as SDSL will be more convenient and cost-effective than ADSL.
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