What is DSL and how can it benefit my home or small business?

ign="center">downstream speed.
DSL or xDSL is a group of technologies that provideVery-high-bit-rate Digital Subscriber Line (VDSL), An
digital data transfer over the telephone network. DSLimprovement on HDSL that Provides a faster rate of
originally stood for digital subscriber loop, but is nowtransmission speed. It uses up to 4 different frequency
commonly referred to as digital subscriber line. Thebands, two for upstream (from the client to the telco)
typical transfer speeds of DSL services range fromand two for downstream.
128 kilobits per second to 24,000 kbit/s. DSLVery-high-bit-rate Digital Subscriber Line 2 (VDSL2), an
technology was originally begun as a part of theimproved version of VDSL Symmetric High-speed
Integrated Services Digital Network (ISDN). ISDN is aDigital Subscriber Line (G.SHDSL), a standardised
series of protocals designed implemented to allow forreplacement for early proprietary SDSL by the
digital transmission of voice and data over theInternational Telecommunication Union
telephone networks standard copper wires. ThisTelecommunication Standardization Sector Powerline
resulted in better speeds and quality than the oldDigital Subscriber Line (PDSL), a high speed powerline
analog system.communications solution which modulates high speed
Most Common Forms of DSLdata onto existing electricity distribution infrastructure
Asymmetric Digital Subscriber Line (ADSL) is a formDSL Service offers small business customers high
of DSL that enables faster transmission of data overspeed internet access for a very reasonable rate.
these same copper wires than a standard dial upMany people don't realize that DSL speeds of 1.5Mbps
modem can. It accomplishes this by using theare the same as T1 speeds which top out at 1.5Mbps.
frequencies that are normally not used by a voiceDSL costs $35 per month on average where a full T1
telephone call, in particular, frequencies higher thanusually costs $400 or $500 if you're in a metro location
normal human hearing.and up to $1,000 per month if you're in a rural location.
The drawback to ADSL is that it is ony effective overWhy the high cost for T1 service without the extra
relatively short distances. The user must be within 5speed? A T1 gives reliable service and is not shared
km of the telephone companies Central Office. Oncewith other subscribers or oversubscribed the way DSL
there, the ADSL signal is stripped off and immediatelyis. Because it is not a shared service it carries a high
routed onto a conventional internet network, while anycost.
voice-frequency signal is switched into the conventionalDSL service offers a slightly less reliable service for a
phone network. This is allows a single phone line to befraction of the cost. If you already have DSL Service
used for both voice and data transfer.you may have noticed that it's fast at some times and
The most distinguishing characteristic of ADSL is thatslower at other times. This is because it's
data transmission speeds are greater in one directionoversubscribed. Oversubscription means that many
than the other. This is often marketed to smallpeople are pulling from the same resource. What does
businesses or residential users who are mostthis mean to you? Slow speeds occasionally in peak
interested in accessing the internet at an affordabletraffic hours.
price. It allows for higher download speeds, thusMost small business users' biggest concern is price and
decreasing the users time to view websites andthat's why DSL Service is so popular among them. A
download files. This is not recommended if one has afew slow periods are a small price to pay for a 90%
need to upload large quantities of information or rundiscount.
servers that would require large amounts of bandwidthScott Pimental is an independent telecommunications
in the other direction.consultant specializing in working with small business
Symmetric Digital Subscriber Line (SDSL) is a DSLowners to find the best telecommunication solutions
variant that enables the user to have the same datafor their small business. His site, has created a
transfer rate in both directions. This technology has aone-stop-shop interface that will allow you to see
transfer speed range of 72 to 2320 kbit/s. Thereal-time price and availability of high speed internet
primary drawback is that you must be even closer toservices in your local area.
the telephone companies central office. A maximumYou can visit his website at
distance of 3 km is all that is supported. It is also muchReport this article
more expensive.This article is free for republishing
Typical DSL technologies include:Source:
High Data Rate Digital Subscriber Line (HDSL), the firstRepublish this article
DSL technology that uses the higher frequesncy
spectrum to transmit dataAsk a Question About this Article
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