Essay, Research Paper: Digital Subscriber Line


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Digital Subscriber Line new technology that takes advantage of standard copper
telephone line to provide secure, reliable, high-speed Internet access. DSL
refers to the family of digital subscriber line technologies, such as ADSL, HDSL,
and RADSL. Connection speed for DSL ranges from 1.44 Mbps to 512 Kbps downstream
and around 128 Kbps upstream. Unlike traditional connections DSL such as analog
modems and IDSN, DSL deliver continuous ďalways onĒ access. That means
multimedia-rich websites, e-mail, and other online applications are available
anytime. DSL makes it possible for you to remain online even while youíre
talking on the telephone-without jeopardizing the quality of either connection.
DSL is available in a spectrum of speeds. Some are best home use, while others
are designed to accommodate rigorous business demands. Whether for business or
the home, DSL, offers unsurpassed price/performance value compared to other
online options. There are the five facts that one should know about DSL. It is
remarkably fast. With DSL service, you can benefit from Internet speeds that are
up to 12 minutes faster than a typical ISDN connection and 50 times faster than
traditional 28.8 Kbps modems. This means that in the 12 seconds it takes to read
this information, you could have downloaded a 2 megabyte presentation file or
web photograph. It would take 10 more minutes (600 more seconds!) to download
the same with a traditional 28.8 Kbps. Itís highly reliable. One can depend on
DSL because its proven technology takes full advantage of the existing
telecommunications infrastructure. Itís inherently secure. DSL network
provides a dedicated Internet connection via private telephone wires, you can
bypass dial-up intruders or shared network hackers. Unlike traditional dial-upp
modems or cable modems. DSL protects your valuable data with the most secure
connection available. Itís surprising affordable. DSL is widely recognized as
the most cost-effective connectivity solution for small buisness. DSL delivers
industrial- strength like speed to multiple users at only 25% of typical TI
costs. There is no better price option available. DSL is also an exceptional
value for home users. At about $2 a day for services that meets the needs of
most people. The connection is always on. Itís ready to run every minute of
the day. Thereís no more logging on and off. No more busy signals or
disconnects. This gives you the freedom to focus on what you want to accomplish
on line rather than focusing on trying to get connected. In fact, you can be
more productive because the power and immediacy of the internet is continuously
available at your fingerprints. DSL is a network access technology that
telephone companies have been testing and refining since the beginning of the
decade. It has unique advantages that it can provide high speed digital
transmission over 750 million ordinary phone lines that make up our
communication infrastructure. Speed 384 Kbps 128 Kbps 28.8 Kbps 2 Mb image files
72 seconds 3.6 minutes 15.9 minutes 72 MB video 43 minutes 2.2 hours 9.6 ours
DSL enables todayís users to gain continuous access to the Internet or
corporate Local Area Neworks (LANs) at an amazing rate of 25 times to 100 times
faster than the 56.6 kilobits per seconds modems. DSL modems use sophisticated
digital coding techniques that squeezes up to 99% or more capacity out of an
ordinary phone line, making a super-fast network access possible. DSl was
originally developed to support video on demand services that telephone
companies planned to offer to compete with cable companies. However most
companies have backed away from these services. Instead, DSLís high speed
capacity have made it the technology of choice for the majority of the lines
leased by large corporation for private voice and data networks. DSL comes in
many different varieties: ADSL Asymmetric or Asynchronous Digital Subscriber
Line service transmits faster on direction (1.544 Mbps downstream to the house)
than the other (384 Kbps to the the telephonw companyís CO). ADSL bases
services offer high power Internet users who want to download large files and
other resources from the Web in less time than it normally would. SDSL Symmetric
Digital Subscriber Line (also know as the single line) provides 144 Kbps of
bandwidth in both directions. SDSLís is cheaper than other services provided
by DSL. It has the ability to transfers information in both directions. Itís
ideal for most buisness applications, including internet access, or connecting
remote offices of large corporations. IDSL ISDN Digital Subscriber line service
is designed to accommodate users that already invested in ISDN. This is buisness
oriented service, it provides ISDN signalling at 144 Kbps over a DSL circuit. It
plugs into existing ISDN equipment a local carrierís CO. HDSL High speed
Digital Subscriber Line, it runs approximately 6 Mbps. This service is used to
provide T-1 digital servies (1.544 Mbps) over standard telephone lines.
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