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56K
The term 56K refers to a new generation of modems
that improve 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 They have been replaced
by a new, international standard for 56K data communications known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.
CDSL
Consumer Digital Subscriber Line (CDSL) is a
proprietary technology trademarked by Rockwell International.
CSI
Customer Self-Install; an option the end-user
has to install their 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, which 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 256Kbps upstream, or
256+Kbps downstream and 128Kbps upstream.
EtherLoop
EtherLoop is currently a proprietary technology
from Nortel, short for Ethernet Local Loop.
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.
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 their Internet
Service Provider (ISP) or Enterprise Network.
RADSL
Rate Adaptive Digital Subscriber Line (RADSL)
is any rate adaptive DSL modem, but may specifically refer to a
proprietary modulation standard designed by Globespan Semiconductor.
SDSL
Symmetric Digital Subscriber Line (SDSL) is
a 2-wire implementation of (HDSL).
V.90 & V.92
International standards 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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