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Digital Subscriber Line Technologies Essay

3431 words - 14 pages

IntroductionIn today's fast paced society, people are constantly searching for new ways to improve their speed of data transmission. DSL (Digital Subscriber Line) is an answer to the needs of our society. DSL is a means of providing users with high data transmission speeds with high levels of bandwidths all over the medium of the simple copper telephone wire. DSL and the development of various types of DSL has become an essential part of our information based economy. DSL comes with numerous advantages and disadvantages, therefore, before a business can make an informed decision on whether or not to implement a DSL solution, they must first evaluate all the various aspects of DSL ...view middle of the document...

xDSL technology is enabling a consumer to utilise their existing telephone connection to have high speed internet access. It splits the connection into two, whereby any frequency less than 4kHz is reserved for voice and faxing, and anything greater than that is used for data transmission purposes.How DSL Works DSL works by utilising an existing POTS telephone line's unused capacity. This is because the twisted pair copper wire used for the local loop has a bandwidth of up to 1 megahertz, but the analog voice channel uses only the 0 to 4,000 hertz range (Peden, 2001, p.266). What DSL does is utilize the unused bandwidth that is not needed by normal voice conversations as digital channels, unlike traditional internet access via modems which have to convert digital data into analog for transmission through the phone line. (Yen, 2001, p.29) This allows DSL to be concurrently used with normal voice transmissions since DSL transmissions are occupying the upper frequencies. To prevent the DSL signals from interfering with regular voice transmissions, devices which block out the higher than 4Khz frequencies called low pass filters are installed on the phone lines that are not connected to the DSL modem (Franklin, 2003). DSL divides the bandwidth unused by analog voice transmissions into 2 channels, one for sending and the other for receiving (Yen, 2001, 30). How much bandwidth is allocated for sending/receiving is dependant on the version of DSL which the provider has chosen to implement.However, these speeds for DSL vary based on distance from the end user to the CO. As the distance increases, the speeds fall. "The limit for ADSL service is 18,000 feet (5,460 meters), though for speed and quality of service reasons many ADSL providers place a lower limit on the distances for the service. At the extremes of the distance limits, ADSL customers may see speeds far below the promised maximums, while customers nearer the central office have faster connections and may see extremely high speeds in the future" (Franklin, 2003). At the central office of the DSL service provider, there is a piece of equipment called a DSLAM (DSL Access Multiplexer) which communicates with each of the end users' DSL modem. The DSLAM is what connects all of the end users in a particular geographic area around the CO to the internet through a single high speed connection (Franklin, 2003). The follow diagram illustrates this as well as how the rest of the connections are made at the end user side.Applications of DSL TechnologyThere are a number of applications of DSL for home and business users which include, but are not limited to the following: E-commerce/On-line shopping, LAN Access from home, multimedia applications, hosting of web servers and distance learning.E-commerce/On-line Shopping: DSL will speed up the process in which electronic transactions are done by limiting the time needed for pages to download.Remote LAN: "With DSL, employees can access their...

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