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Topic: Digital Subscriber Line


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  Digital Subscriber Line (DSL)
DSL (Digital Subscriber Line) is a relatively new method of achieving high speed internet access using the existing twisted copper pair telephone lines which currently provide conventional POTS (Plain Old Telephone Service) from the subscribers premises to the central office.
High-speed data service over existing lines is possible because of the electrical characteristics of the copper line, which, if the line is not too long, permit useful signals to be transmitted over a band of frequencies as high as one megahertz.
When a new line is required in any one building at a future date the subscriber is simply connected to the "bridged tap" which was fortuitously installed when line installation crews were available in the past.
pcgroup.nwark.com /dsl2--70.htm   (1978 words)

  
 Digital subscriber line - Wikipedia, the free encyclopedia
DSL or xDSL, is a family of technologies that provide digital data transmission over the wires of a local telephone network.
Digital Subscriber Line technology was originally implemented as part of the ISDN specification.
DSL is the principal competition of cable modems for providing high speed Internet access to home consumers in Europe and North America.
en.wikipedia.org /wiki/Digital_Subscriber_Line   (1749 words)

  
 Digital Subscriber Line
Digital Subscriber Line (DSL) technology is a modem technology that uses existing twisted-pair telephone lines to transport high-bandwidth data, such as multimedia and video, to service subscribers.
Line attenuation increases with line length and frequency, and decreases as wire diameter increases.
ISDN digital subscriber line (IDSL) is a cross between ISDN and xDSL.
www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/dsl.htm   (3693 words)

  
 Digital Subscriber Line (xDSL) FAQ v20010108   (Site not responding. Last check: 2007-10-21)
DSL refers to the technology used between a customer's premises and the telephone company, enabling more bandwidth over the already installed copper cabling than users have traditionally had.
Digital methods are used as long as frequency response (bandwidth) is not a limitation.
Depending on the DSL provider, you may either be assigned one or more static IP addresses for your end hosts or you may be required to use the dynamic host configuration protocol (DHCP) to obtain a valid IP address while you are connected to the Internet.
www.faqs.org /faqs/datacomm/xdsl-faq   (8729 words)

  
 Digital Subscriber Line   (Site not responding. Last check: 2007-10-21)
A DSL line can carry both data and voice signals and the data part of the line is continuously connected.
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.
www.kean.edu /~mlinda/dsl.html   (2255 words)

  
 Digital Subscriber Line
Digital Subscriber Line is a technology based on the idea that data transmitted over twisted pair (P.O.T.S.) lines does not need to be converted from digital to analog and then back to digital, which is how modems work.
Instead the data is transmitted across the lines as digital data, which allows the phone company to use much wider bandwith in transmitting the data.
Line quality is a measure of the signal-to-noise ratio on a given line.
networking.ringofsaturn.com /Telecommunications/DSL.php   (6347 words)

  
 Howstuffworks "How DSL Works"
DSL is a very high-speed connection that uses the same wires as a regular telephone line.
DSL exploits this "extra capacity" to carry information on the wire without disturbing the line's ability to carry conversations.
Symmetric DSL (SDSL) - This connection, used mainly by small businesses, doesn't allow you to use the phone at the same time, but the speed of receiving and sending data is the same.
www.howstuffworks.com /dsl.htm   (1110 words)

  
 DSL (Digital Subscriber Line) (Linktionary term)
DSL is a technology that provides high-speed data transmissions over the so-called "last-mile" of "local-loop" of the telephone network, i.e., the twisted copper wire that connects home and small office users to the telephone company central offices (COs).
DSL technologies can enhance copper wire infrastructure to be the most effective way of delivering broadband services to the greatest number of people.
DSL Lite (or G.Lite) DSL Lite is considered a "jump-start" technology that is meant to deliver DSL to the greatest number of users, as fast as possible.
www.linktionary.com /d/dsl.html   (1007 words)

  
 DSL - Glossary - CNET.com   (Site not responding. Last check: 2007-10-21)
Digital subscriber lines carry data at high speeds over standard copper telephone wires.
With DSL, data can be delivered at a rate of 1.5 mbps (around 30 times faster than through a 56-kbps modem).
Currently, DSL is expensive because specialized equipment--a splitter--needs to be installed at the subscriber's location.
www.cnet.com /Resources/Info/Glossary/Terms/dsl.html   (107 words)

  
 Verio High-Speed Internet Service
DSL is technology backed by telephone companies to provide next generation high bandwidth services to the home and business using the existing telephone cabling infrastructure.
DSL to the home over existing phone lines currently provides bandwidths up to 1.5Mbps in the San Francisco Bay area.
DSL technologies use a greater range of frequencies over the cable than traditional telephone services which in turn allow for greater bandwidth with which to send and receive information.
cognigen.net /verio/faq.cgi?information   (1797 words)

  
 IT Services: Remote SUNet Access over DSL
Students living off campus are also eligible to subscribe to the service and are themselves responsible for all associated one-time and monthly charges (an overview of DSL service for students is at http://www.stanford.edu/services/dsl/students/).
Since the SUNet DSL line provides a SUNet connection similar to the network jack that your campus office computer plugs into, setting up the software in your computer for a DSL connection is just as easy as configuring a computer for an on-campus Ethernet connection.
Therefore, it is the responsibility of all DSL subscribers to observe the University's Computer Security Guidelines for their DSL-connected equipment, as well as their on-campus desktop equipment.
www.stanford.edu /services/dsl   (1019 words)

  
 DSL Digital Subscriber Line Glossary AD
A circuit switch that terminates all the local access lines in a particular geographic serving area; a physical building where the local switching equipment is found.
The oldest of the DSL technologies, HDSL continues to be used by telephone companies deploying T1 lines at 1.5 Mbps and requires two twisted pairs.
A generic term for the suite of digital subscriber line (DSL) services, where the "x" can be replaced with any of a number of letters.
www.aquila.net /html/dsl_glossary_ad.html   (1295 words)

  
 Howstuffworks "How VDSL Works"
DSL exploits this remaining capacity to carry information on the wire without disturbing the line's ability to carry conversations.
DSLAMs are generally flexible and able to support multiple types of DSL, as well as provide additional functions such as routing and dynamic IP address assignment for customers.
DSL is a distance-sensitive technology: As the connection's length increases, the signal quality and connection speed decrease.
www.howstuffworks.com /vdsl.htm   (973 words)

  
 Digital Subscriber Line (DSL)
VDSL is still in the definition stage; some preliminary products exist, but not enough is known yet about telephone line characteristics, radio frequency interface emissions and susceptibility, upstream multiplexing protocols, and information requirements to frame a set of definitive, standardizable properties.
This is unknown because real line characteristics at the frequencies required for VDSL are speculative, and items such as short bridged taps or unterminated extension lines in homes, which have no effect on telephony, ISDN, or ADSL, may have very detrimental affects on VDSL in certain configurations.
As line length shrinks, either from natural proximity to a central office or deployment of fiber-based access nodes, ADSL and VDSL simply offer more channels and capacity for services that require rates above T1/E1 (such as digital live television and virtual CD-ROM access).
www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/adsl.htm   (3937 words)

  
 Digital Subscriber Line FAQ
In addition to having DSL technology available in their central office, customers must be less than 14,000 feet or less than three miles from their central office to qualify for DSL Internet service.
It is a digital circuit from your home to the telephone company's central office, using normal, copper telephone line.
POTS lines, which generally consist of 2 to 4 wires, are what we use everyday to place phone calls and make analog connections to the Internet.
public.pacbell.net /faq/dsl_faq.html   (3376 words)

  
 Digital Subscriber Line FAQ
In addition to having DSL technology available in their central office, customers must be less than approximately 3 miles from their central office to qualify for SBC DSL Internet Access.
However, customers who do not have SBC DSL Package available from their central office, or who live beyond the local loop requirements, or need the mobility and flexibility of a switched service will remain as ISDN or analog modem customers.
It is a dedicated digital circuit from your home to the telephone company's central office, using normal, copper telephone line.
public.swbell.net /faq/dsl_faq.html   (3811 words)

  
 DSL (digital subscriber line)
Early DSL standards entailed installing a signal splitter at the customer premises to separate the voice and data as well as a "DSL modem" to connect the user's PC to the data-stream.
At the telco office, a digital subscriber line access multiplexer, or DSLAM, served as the connection between the individual DSL streams and the backbone network.
In fact, DSL is often known as "xDSL" to account for the many flavors of DSL that have arrived on the scene.
www.networkworld.com /details/576.html   (925 words)

  
 Digital Subscriber Line FAQ
ISDN and analog modem customers who qualify for DSL Internet service and only need to connect to the Internet from one location will want to switch to DSL Internet service in order to take advantage of the benefits of higher speeds and an "always on" connection.
VDSL (Very high-data-rate Digital Subscriber Line) technology supports an upstream information transfer rate of 1.5 Mbps to 2.3 Mbps and a downstream information transfer rate of 13 Mbps to 52 Mbps.
DSL Internet access includes a point-to-point "instantly available" connection to Nevada Bell Internet Services and thus, the Internet, much like a PVC in a Frame Relay network.
public.nvbell.net /faq/dsl_faq.html   (3265 words)

  
 Digital Subscriber Line (DSL)   (Site not responding. Last check: 2007-10-21)
Digital Subscriber Line (DSL) Access technology provides "always-on", broadband connections to the Internet over twisted-pair, copper phone lines.
The main components in a DSL Access System are the DSL Modem, the copper wire, and the DSL Access Multiplexer (DSLAM).
Typical DSL line rates are between 384 kbps and 1.544 Mbps but sometimes go in the 10s of Mbps rates.
www.xilinx.com /esp/wired/optical/net_tech/dsl.htm   (208 words)

  
 Asymmetric Digital Subscriber Line   (Site not responding. Last check: 2007-10-21)
(ADSL, or Asymmetric Digital Subscriber Loop) A form of Digital Subscriber Line in which the bandwidth available for downstream connection is significantly larger then for upstream.
Although designed to minimise the effect of crosstalk between the upstream and downstream channels this setup is well suited for web browsing and client-server applications as well as for some emerging applications such as video on demand.
Typically the upstream data flow is between 16 and 640 kilobits per second while the downstream data flow is between 1.5 and 9 megabits per second.
burks.bton.ac.uk /burks/foldoc/27/8.htm   (182 words)

  
 ADSL, Asymmetric Digital Subscriber Line
Asymmetric Digital Subscriber Line offers the benefits of the Information Superhighway without the expense or wait.
ADSL enables the delivery of switched digital video services now over the existing telephone infrastructure, composed primarily of copper wire pair, instead of waiting for the implementation of costly new cabling systems.
The POTS channel is split off from the digital modems by filters, thus guaranteeing uninterrupted POTS.
www.4i2i.com /adsl.htm   (211 words)

  
 Digital Subscriber Line   (Site not responding. Last check: 2007-10-21)
Contact Us DSL is now available to everyone in our calling area.
Most NEHP DSL customers are averaging around 500k up / 1.3 meg down.
a DSL modem, you can purchase a one port (for one computer) from NHTC for $99.00.
www.nehp.net /dsl.htm   (267 words)

  
 IEC: Digital Subscriber Line Access Multiplexer (DSLAM)
A digital subscriber line access multiplexer (DSLAM) delivers exceptionally high-speed data transmission over existing copper telephone lines.
A DSLAM separates the voice-frequency signals from the high-speed data traffic and controls and routes digital subscriber line (xDSL) traffic between the subscriber's end-user equipment (router, modem, or network interface card [NIC]) and the network service provider's network.
This tutorial will examine strategies for improving upon and maximizing the benefits of DSL technology deployment and identifying those products and services that best increase carrier revenue yield.
www.iec.org /online/tutorials/dslam   (136 words)

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