Let's start with the basics....
DSL = Digital Subscriber Line
DSL is a technology, not a product. It is a method
of carrying data over standard copper phone lines.
It's not necessary to know how this is done, just
know that it's at a much higher frequency than
standard voice & fax transmissions - which
is why it's able to share the phone line with
other services.
DSL Lite = Digital Subscriber Line Lite
This is the server, slower than ADSL, offered
by incumbent and competitive exchange providers.
It is lower in cost to provision because a splitter
to separate the data transmission from the voice
call is not needed in the central office and at
the customer site.
ADSL = Asymmetric Digital Subscriber Line
The speeds on the line are different on data sent
to the customer and on upstream data sent away
from the customer. ADSL is also known as full-rate
ADSL.
ADSL2 = ADSL2 has been specifically designed to improve the rate and reach of ADSL largely by achieving
better performance on long lines in the presence of narrowband interference. It provides better modulation efficiency by mandating four dimensional, 16-state trellis-coded
and 1-bit quadrature amplitude modulation (QAM) constellations, which provide higher data rates on long lines where the signal-tonoise
ratio (SNR) is low. ADSL2 systems reduce framing overhead by providing a frame with a programmable number of
overhead bits.
SHDSL = Symmetric high-bit-rate Digital Subscriber
Line
Provides the same upstream and downstream to the
customer. Often offered at slower speeds than
ADSL, because the performance is overall better
even at reduced speeds.
VDSL = Very high-bit-rate Digital Subscriber Line
Because of its high speed, it requires a combination
of fiber and copper cabling.
Exa prefers to sell ADSL or SHDSL services
from NEXTEP or Connect, as they use their own
network of Internet connections and DSLAMs (Digital
Subscriber Line Access Multiplexers). These two
providers are able to offer Service Level Agreements
(SLAs) and achieve at least 99.95% uptime and
much faster speeds.
If you require more information,
please
click
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