Glossary
ABR
Available Bit Rate
ADSL
Asymmetric Digital Subscriber Line
AFE
Analog Front End
API
Application Programming Interface.
ATM
Asynchronous Transfer Mode
ATU-C
ADSL Transceiver Unit - CO End.
ATU-R
ADSL Transceiver Unit - Remote End.
Burst
Tolerance
(also referred to as Maximum Burst Size), in cells/second (only applicable
for VBR service). This is the maximum number of cells that can be sent
at the peak rate. This information should be obtained from the service
provider.
CAP
Carrier Amplitude and Phase Modulation.
CBR
Constant Bit Rate.
CHAP
Challenge Handshake Authentication Protocol. Part of the PPP protocol
to ensure authentication of the connection between two devices.
CO
Central Office
Constellations
The constellation size is directly proportional to the total rate of bit
transmission. The larger the constellation size, the faster transmission
will be.
CPE
Customer Premises Equipment.
CRC
(Cyclic Redundancy Check)
CRC fields detect bit errors.
DataLink Protocol
A datalink, or logical data stream, is implemented by PPP protocol. PPP
may run multiple protocols over the same connection.
DMA
Direct Memory Access
DMT
Discrete Multitone Modulation.
DNS
(Domain Name Service)
Domain Servers are computers which contain the programs and files which
make up a domain's name database. The server uses the name database to
translate the name you provide to an IP address, which is used to establish
a connection with the host computer.
DSLAM
Digital Subscriber Line Access Multiplexer
DSP
Digital Signal Processor.
DUN
Dial Up Networking.
Encapsulation
This is one of the protocols for transmission.
HDLC
High-Level Data Link Control
ILMI
Version
(Interim Local Management Interface version)
This is an SNMP based management protocol for an ATM UNI.
IP
Internet Protocol.
IPX
Internetwork Packet Exchange, the default data packet protocol for Novell's
NetWare operating system.
ISA
Industry Standard Architecture.
ISP
Internet Service Provider.
MAC
Medium access control, a protocol for determining which device has access
to the network at any one time.
NDIS
Network Driver Interface Specification as developed by Microsoft.
NID
Network Interface Device
PAP
Password Authentication Protocol. Part of the PPP protocol to ensure authentication
of the connection between two devices.
PCI
Peripheral Component Interconnect. This is bus technology, referring to
the slot where the board connects to the computer.
PCR
(Peak Cell Rate)
This is the maximum amount of cells/second transmitted over this connection.
This is determined by the minimum intercell spacing in seconds, which
is the time interval from the first bit of one cell to the first bit of
the next cell.
PMD
Physical Media Dependent.
POTS
Plain Old Telephone Service.
PPP
(Point to Point Protocol)
This is one of the various protocols for data transmission.
Protocol
A set of rules and procedures that govern the exchange of data between
two communicating systems.
PVC
( Permanent Virtual Circuit)
A PVC is a logical dedicated circuit between two user ports in point-to-point
configuration. This is referring to the connection from the computer to
the Internet Service Provider (ISP).
RAS
Remote Access Server
RFC
1483
This is a protocol for the connection. It is technically referred to as
Multiprotocol Encapsulation over ATM Adaption Layer 5.
RIP (Routing Information Protocol)
The protocol governing the exchange of routing information between IP
routers.
SRAM
Static RAM
SCR
(Sustainable Cell Rate)
The sustainable cell rate, in cells/second, at which cells are transmitted
over this connection (only applicable for VBR service). This is the maximum
average rate for cells that are sent in bursts at a peak rate.
SPX
Sequenced Packet Exchange.
SVC
(Switched Virtual Circuit)
SVCs are virtual circuits established on a call by call basis. SVCs are
not supported in this release of the ADSL Modem.
TCP/IP
Transmission control protocol/Internet protocol, a set of communication
protocols that support peer-to-peer connectivity functions for both local
and wide area networks. TCP/IP is used to connect to the Internet.
UBR
(Unspecified Bit Rate)
This is one of the categories of service available from the service provider.
This specifies no limit on the rate of information flow to the switch.
UNI
Version (User-to-Network Interface Version)
The UNI is the point where the user accesses the network.
VBR
(Variable Bit Rate) This is one of the categories of service. This is
if a certain rate has been specified with the switch for the flow of information.
VCI
(Virtual Channel Identifier)
The VCI is part of the cell header for the cells that are transferred
over this connection.
VPI
(Virtual Path Identifier)
The VPI is part of the cell header for the cells that are transferred
over this connection.
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