Introduction

Using your Modem

Connecting to your Internet Provider

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Troubleshooting

Glossary

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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.