It represents individual varieties of DSL technology. The x in xDSL is a variable that changes depending upon the speed and application of the xDSL technology (e.g., ADSL, VDSL, etc.). The x in xDSL is a variable that changes depending upon the speed and application of the xDSL technology (e.g., ADSL, VDSL, etc.).
xDSL Technology Overview. DSL is a digital broadband transmission technology that involves sending digital information over a subscriber's telephone line, also referred to as the local loop. DSL in general describes the technology, while xDSL represents individual varieties of DSL technology. The x in xDSL is a variable that changes depending upon the speed and application of the xDSL technology (e.g., ADSL, VDSL, etc.). Legend: ATU-C: Asymmetric digital subscriber line (ADSL) transceiver unit central A gateway is commonly used to make an ADSL connection. Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide.  In symmetric digital subscriber line (SDSL) services, the downstream and upstream data rates are equal. Researchers at Bell Labs have reached speeds of 10 Gbit/s, while delivering 1 Gbit/s symmetrical broadband access services using traditional copper telephone lines. These higher speeds are lab results, however. This is possible because DSL uses higher frequency bands for data. On the customer premises, a DSL filter on each non-DSL outlet blocks any high-frequency interference to enable simultaneous use of the voice and DSL services. DSL redirects here. For other uses, see DSL (disambiguation) . Digital subscriber line (DSL; originally digital subscriber loop) is a family of technologies that are used to transmit digital data over telephone lines. This is possible because DSL uses higher frequency bands for data. On the customer premises, a DSL filter on each non-DSL outlet blocks any high-frequency interference to enable simultaneous use of the voice and DSL services. Digital Subscriber Line is a technology that assumes digital data does not require change into analog form and back. Digital data is transmitted to your computer directly as digital data and this allows the phone company to use a much wider bandwidth for transmitting it to you. G.Lite (also known as DSL Lite, splitterless ADSL, and Universal ADSL) is essentially a slower ADSL that doesn't require splitting of the line at the user end but manages to split it for the user remotely at the telephone company. This saves the cost of what the phone companies call the truck roll.. xDSL. xDSL ranges from 6.1Mbps to 155Mbps incoming, and from 600Kbps to 15Mbps outgoing. The x is a wildcard that can be ADSL (asynchronous) or SDSL (synchronous). xDSL uses digital encoding to provide more bandwidth over existing twisted-pair telephone lines (POTS). Many iterations of xDSL allow the phone to be used for data communication at the same time it's being used to transmit data. In this article, Kyle Cassidy explores the different digital subscriber lines and Frame Relay. This article is excerpted from The Concise Guide to Enterprise Internetworking and Security Refers collectively to all types of digital subscriber lines, the two main categories being ADSL and SDSL. Two other types of xDSL technologies are High-data-rate DSL (HDSL) and Very high DSL (VDSL) . xDSL is similar to ISDN inasmuch as both operate over existing copper telephone lines (POTS) and both require the short runs to a central telephone office (usually less than 20,000 feet). DSL (Digital Subscriber Line) is a technology for bringing high-bandwidth information to homes and small businesses over ordinary copper telephone lines. G.Lite (also known as DSL Lite, splitterless ADSL, and Universal ADSL) is essentially a slower ADSL that doesn't require splitting of the line at the user end but manages to split it for the user remotely at the telephone company. This saves the cost of what the phone companies call the truck roll..
http://www.exfo.com/solutions/fttx-access-networks/multiplay-services/xdsl-technology-overview https://en.wikipedia.org/wiki/Asymmetric_Digital_Subscriber_Line https://en.wikipedia.org/wiki/XDSL https://en.wikipedia.org/wiki/XDSL http://whatis.techtarget.com/reference/Fast-Guide-to-DSL-Digital-Subscriber-Line http://www.informit.com/articles/article.aspx?p=21317 http://www.webopedia.com/TERM/X/xDSL.html http://whatis.techtarget.com/reference/Fast-Guide-to-DSL-Digital-Subscriber-Line
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