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What Digital Subscriber Line Is
And How It Works
Digital Subscriber Line is a service that offers a faster Internet
connection than a standard dial-up connection. DSL technology uses
existing 2-wire copper telephone wiring to deliver high-speed data
services to homes and businesses. DSL uses the existing phone line and
in most cases does not require an additional phone line. This gives
always on Internet access and does not tie up the phone line. No more
busy signals, no more dropped connections, no more waiting for someone
in the household to get off the phone. DSL offers users a choice of
speeds ranging from 144 Kbps to 1.5Mbps.
This is 2.5x to 25x times
faster than a standard 56Kbps dial-up modem. This gives the user advantages when downloading softwares like registry cleaner, they have bought on the internet.
Digital Subscriber Line is
a telecommunications service that makes it possible to transform an
ordinary phone line into a high-speed conduit for data, voice and video.
DSL
Benefits
Always-On Service
Phone/Internet Simultaneously
Up to 25x Times Faster Than Dial-up Modem
Cost Effective
No More Busy Signals
No More Dropped Connections
Faster Downloads
Faster Games
Multiple Computers on Single DSL Line
Dedicated Connection & Speed
Many DSL technologies implement an ATM layer over the low-level bit
stream layer to enable the adaptation of a number of different
technologies over the same link.
DSL implementations may create bridged or routed networks. In a bridged
configuration, the group of subscriber computers effectively connect
into a single subnet. The earliest implementations used DHCP to provide
network details such as the IP address to the subscriber equipment,
with authentication via MAC address or an assigned host name. Later
implementations often use PPP over Ethernet or ATM while authenticating
with a userid and password and using PPP mechanisms to provide network
details.
Advantages
There are some disadvantages to the use of DSL service. The greatest
disadvantage at the present time is availability –because DSL
is distance sensitive, availability is determined by the distance from
the providers central office. Although DSL service is widely available
in most metropolitan areas, is often not available in non-metropolitan
or rural areas because the distance sensitivity limitation. Service may
be limited to within 18,000 feet of the DSL providers local office, or
point of presence, though there are usually several such locations in a
given urban area.
Additionally, DSL operates on traditional copper telephone lines, and
is incompatible with fiber optic lines.
Types
of DSL Technologies
ISDN Digital Subscriber Line (IDSL), uses ISDN based technology to
provide data flow that is slightly higher than dual channel ISDN.
High Data Rate Digital Subscriber Line (HDSL / HDSL2), was the first
DSL technology that uses a higher frequency spectrum of copper, twisted
pair cables.
Symmetric Digital Subscriber Line (SDSL / SHDSL), the volume of data
flow is equal in both directions.
Symmetric High-speed Digital Subscriber Line (G.SHDSL), a standardized
replacement for early proprietary SDSL.
Asymmetric Digital Subscriber Line (ADSL), the volume of data flow is
greater in one direction than the other.
Rate-Adaptive Digital Subscriber Line (RADSL)
Very High Speed Digital Subscriber Line (VDSL)
Very High Speed Digital Subscriber Line 2 (VDSL2), an improved version
of VDSL
Etherloop Ethernet Local Loop
Uni Digital Subscriber Line (UDSL), technology developed by Texas
Instruments, backwards compatible with all DMT standards
Gigabit Digital Subscriber Line (GDSL), based on binder MIMO
technologies
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"I
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Luiza
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