Types of DSL Services
Asymmetrical DSL is used in homes and
smaller business where people use information from the Internet
(incoming) more than they send (outgoing). Asymetrical DSL
lines have a 2-way bandwidth which has a larger percentage
of down line use and a smaller percentage is for the up
line messaging. Web pages and graphics demand a large bandwidth.
If you are a small business doing lots of Web pages and
lots of graphics you will need the fastest uploading lines
available. Asymmetrical DSL can share a line with telephones.
Symmetrical DSL is used in some businesses but phone lines
are not operable at the same time. The speed at which information
is went and received is the same. Rate Adaptive DSL is an
ADSL technology in which software is able to determine the
rate at which signals can be transmitted on a given customer
phone line and adjust the delivery rate accordingly. Up
and coming is G-Lite ( or DSL Lite) a somewhat slower ADSL
that does not have to split a line at the user’s end
but it does split at the telephone company. It is for the
company very cost effective. The download speed is about
normal and about half that of regular ADSL.
ISDL (integrated services digital network DSL).
This is a form of DSL that supports symmetric data rates
of up to 144 Kbps using existing phone lines. It is unique
in that it has the ability to deliver services through a
DLC (Digital Loop Carrier: a remote device often placed
in newer neighborhoods to simplify the distribution of cable
and wiring from the phone company). ISDL provides a simplified
delivery of voice service to the new neighborhoods as well
as having the capability of using the same modem as used
for ISDN, which is Integrated Services Digital Network.
VDSL or Very High Data Rate DSL is a technology that is
being developed where a much higher data rate over fairly
short distances can be used. VDSL is used as the final drop
from a fiber optic junction point to nearby customers. VDSL
lets an apartment or office complex obtain high-bandwidth
services using existing copper wires without having to replace
the infrastructure with optical fiber.
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