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Copyright © 2001 HyperUSA, Inc.
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GLOSSARY
56K
The term 56K refers to a new generation of modems that improves the speed of
communication between personal computers and the Internet. The previous
speed standard of v.34 provided communication at speeds as high as 33,600
bits per second (bps). The new 56K modems increase that speed to a
theoretical maximum of 57,600 or 56 Kbps. In the past, two different
technologies emerged enabling 56K communication: K56flex and x2. They have
been replaced by a new, international standard for 56K data communications
known as v.90.
ADSL
Asymmetric Digital Subscriber Line (ADSL) is the most popular form of DSL
technology.
ADSL Lite
A lower data rate version of Asymmetric Digital Subscriber Line
(ADSL).
Broadband
A term for high-speed, high-capacity Internet and data connections.
CAP
Carrier-less Amplitude/Phase (CAP) modulation: incoming data modulates a
single carrier that is then transmitted down a telephone line. The carrier
itself is suppressed before transmission (it contains no information, and
can be reconstructed at the receiver), hence the adjective "carrier-less."
CAP and DMT are two modulation systems currently on the market for
ADSL.
CSI
Customer Self-Install: an option the end-user has to install the DSL
service themselves (and not incur any technician installation charges). With
the documentation provided, the customer will install their DSL modem and
Network Interface Card (NIC) to the computer. This will enable the DSL
connection.
DMT
Discrete Multi-Tone (DMT) multi-carrier modulation uses 256 QAM modulation
tones simultaneously to create the ADSL signal. DMT is the basis of ANSI
Standard T1.413 and has the support of other world standards bodies. CAP
and DMT are two modulation systems currently on the market for ADSL.
DSL
Digital Subscriber Line (DSL) provides a dedicated digital circuit between a
residence and a telephone company's central office, allowing high-speed data
transport over existing twisted copper telephone lines. We currently offer
two ADSL (Asymmetric Digital Subscriber Line) product options to support
information transfer rates of 1.5+Mbps downstream and 384Kbps upstream, or
384+Kbps downstream and 128Kbps upstream.
HDSL
High Bit-rate Digital Subscriber Line (HDSL) is generally used as a
substitute for T1/E1.
IDSL
ISDN based DSL developed originally by Ascend Communications.
ISDN
Integrated Services Digital Network is a digital
telecommunications line that can transmit both
voice and digital network services up to 128K and
are much faster and more reliable than high-speed
analog modems.
LAN
Local Area Networks.
MSO
Multiple service operator, synonymous with cable provider.
NAP
Network Access Point (NAP) is a high-speed interconnection service that
gives Internet Service Providers access to the new Internet
infrastructure.
NIC
Network Interface Card: an Ethernet adapter "PC card" that needs to be
installed in the computer when certain DSL modems are used. Along with the
modem, the NIC enables the DSL connection at the customer's home or
business.
POTS splitter
A Plain Old Telephone Service (POTS) splitter, also known as a
low-pass/high-pass filter, separates the voice and data portions of the DSL
line. Current DSL technology requires two POTS splitters: one in our central
office and one in the customer's premises.
PVC
Private Virtual Circuit (PVC) is a point-to-point circuit from the customer
premise equipment to either the Internet Service Provider (ISP) or
Enterprise Network.
SDSL
Symmetric Digital Subscriber Line (SDSL) is a two-wire implementation of
(HDSL).
v.90
A new, international standard for 56K data communications.
VDSL
Very High Bit-rate Digital Subscriber Line (VDSL) is proposed for shorter
local loops, perhaps up to 3000 ft.
WAN
Wide area networks.
XDSL
Refers to the family of digital subscriber line technologies, such as ADSL,
HDSL, and RADSL.
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