Asymmetric Digital Subscriber
Asymmetric Digital Subscriber Line (ADSL) offers
a broadband connection technology.
ADSL uses existing copper wires installed for telephone systems
to deliver high-rate digital data. This makes ADSL economically
interesting for the local telephone companies. They can offer
customers high speed data services even before switching to fiber-optics.
Many telephone exchanges are now ADSL ready, and many businesses
have already changed their systems to ADSL services. ADSL can
provide high speeds around thirty to forty times faster than the
up modem connection. It uses a wide range of frequencies.
The big advantage of ADSL connections is that it offers the bandwidth
needed for high quality Voice services, so single line with an
ADSL connection can be used for web surfing, internet telephony
and as a fax line at the same time.
The reason behind the first word Asymmetric of ADSL connection
is due to its different capacity to download and upload. ADSL
connection offers more capacity for downloads i.e. from the internet
to your computer than for uploads. The amount of information you
can send out in particular time is much less than the amount of
information you can download. ADSL is very useful because most
users download more documents, web pages and emails than they
The ADSL system makes use of your existing telephone line and
splits the signal into voice communications and high speed data
connection. ADSL makes use of a frequency range not used by voice
communications. This means that ADSL lines can be used for internet
access at the same time as voice calls, or that a line can be
used simultaneously for email and to receive faxes. In ADSL there
are no charges according to time or any call charges so it can
be termed as an 'always on' technology, as your computer or network
may permanently connected to the internet through your ADSL router
or broadband modem.
The advantages of ADSL:
ADSL offers you better internet functionality higher
ADSL bandwidth compared with ISDN or modem connection. Using ADSL
you can download documents, web pages and send email faster. You
can even view or send real time audio and video files very quickly.
Internet telephony over ADSL may also be very useful to businesses
to cut call costs to customers internationally.
In ADSL you are charged for set up once and then monthly bandwidth
charges. There are no call charges like in modem or ISDN
connection. This ADSL service is typically configured to internet
usage as downloading is higher than uploading.
The disadvantages of ADSL:
The term contention ratio represents number of users against one
line. Every ADSL line is shared among 50 users so the ratio comes
out to be 50:1in case of home users, whereas for business users
the ratio is 20:1. The number of users using one line at any particular
point of time can make your bandwidth fluctuate. ADSL does not
provide any guarantee of the level of service.
ADSL can only travel reliably over copper line so if your telecommunications
provider has added fiber between your organization and the local
exchange, you will be unable to receive ADSL.
More Useful Information on
Free Dialup Connections,
Internet, Broadband, Modems..
(Asymmetric Digital Subscriber Line) FAQ's
is ADSL (Asymmetric Digital Subscriber Line)?
Transfer in Dialup Modem.
Connection Modem Issues.
Connection Speed and Throughput.
Connection and your Telephone Line..
Connection with V.92 Modem.
Effect of Additional Phone
Equipment on Dialup.
Effect of Electromagnetic
Interference on Dialup Connection.
of Dialup Connection Speed.
Evolution of Dialup Modems.
of Dialup Internet Access.
is ISDN (Integrated Services Digital Network)?
to Dialup Connection.
Issues Causing Dialup Connection Failure.
Features of a Good ISP?
Types of Hardware Modems.
and Dialup Connection Speed.
Rate Dialup Connection Fraud.
Access Numbers Dialup Scam.
up the Initial Connection Process.
To Check if your Modem does not Dial.
Steps to Troubleshoot Slow
Dialup Connection Speed.
Understanding the High Speed
Understanding Internet Connection
the Working of a Modem.
Modem Technology FAQ.