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Digital Subscriber Line is a service that offers a faster Internet connection than a standard dial-up connection. DSL technology uses existing 2-wire copper telephone wiring to deliver high-speed data services to homes and businesses. DSL uses the existing phone line and in most cases does not require an additional phone line. This gives always on Internet access and does not tie up the phone line. No more busy signals, no more dropped connections, no more waiting for someone in the household to get off the phone. DSL offers users a choice of speeds ranging from 144 Kbps to 1.5Mbps. This is 2.5x to 25x times faster than a standard 56Kbps dial-up modem. Digital Subscriber Line is a telecommunications service that makes it possible to transform an ordinary phone line into a high-speed conduit for data, voice and video. DSL Benefits Always-On Service Phone/Internet Simultaneously Up to 25x Times Faster Than Dial-up Modem Cost Effective No More Busy Signals No More Dropped Connections Faster Downloads Faster Games Multiple Computers on Single DSL Line Dedicated Connection & Speed Many DSL technologies implement an ATM layer over the low-level bit stream layer to enable the adaptation of a number of different technologies over the same link. DSL implementations may create bridged or routed networks. In a bridged configuration, the group of subscriber computers effectively connect into a single subnet. The earliest implementations used DHCP to provide network details such as the IP address to the subscriber equipment, with authentication via MAC address or an assigned host name. Later implementations often use PPP over Ethernet or ATM while authenticating with a userid and password and using PPP mechanisms to provide network details. Advantages There are some disadvantages to the use of DSL service. The greatest disadvantage at the present time is availability –because DSL is distance sensitive, availability is determined by the distance from the providers central office. Although DSL service is widely available in most metropolitan areas, is often not available in non-metropolitan or rural areas because the distance sensitivity limitation. Service may be limited to within 18,000 feet of the DSL providers local office, or point of presence, though there are usually several such locations in a given urban area. Additionally, DSL operates on traditional copper telephone lines, and is incompatible with fiber optic lines. Types of DSL Technologies ISDN Digital Subscriber Line (IDSL), uses ISDN based technology to provide data flow that is slightly higher than dual channel ISDN. High Data Rate Digital Subscriber Line (HDSL / HDSL2), was the first DSL technology that uses a higher frequency spectrum of copper, twisted pair cables. Symmetric Digital Subscriber Line (SDSL / SHDSL), the volume of data flow is equal in both directions. Symmetric High-speed Digital Subscriber Line (G.SHDSL), a standardized replacement for early proprietary SDSL. Asymmetric Digital Subscriber Line (ADSL), the volume of data flow is greater in one direction than the other. Rate-Adaptive Digital Subscriber Line (RADSL) Very High Speed Digital Subscriber Line (VDSL) Very High Speed Digital Subscriber Line 2 (VDSL2), an improved version of VDSL Etherloop Ethernet Local Loop Uni Digital Subscriber Line (UDSL), technology developed by Texas Instruments, backwards compatible with all DMT standards Gigabit Digital Subscriber Line (GDSL), based on binder MIMO technologies So if you are looking for an internet service provider, or if you plan to switch to another ISP, consider digital subscriber list. You can visit popuplar forums to get feedback about the best DSL provider in your city.
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