Glossary - ZyXEL Communications Prestige 681 User Manual

The 10-Mbps baseband Ethernet specification that uses two pairs of twisted-pair cabling
10BaseT
(Category 3 or 5): one pair for transmitting data and the other for receiving data.
Address Resolution Protocol is a protocol for mapping an Internet Protocol address (IP
ARP
address) to a physical machine address that is recognized in the local network.
A high-speed line or series of connections that forms a major pathway within a network.
Backbone
This is the capacity on a link usually measured in bits-per-second (bps).
Bandwidth
(Binary Digit) -- A single digit number in base-2, in other words, either a 1 or a zero. The
Bit
smallest unit of computerized data.
A set of bits that represent a single character. There are 8 bits in a Byte.
Byte
Call Detail Record. This is a name used by telephone companies for call related information.
CDR
Challenge Handshake Authentication Protocol is an alternative protocol that avoids sending
CHAP
passwords over the wire by using a challenge/response technique.
A software program that is used to contact and obtain data from a Server software program
Client
on another computer. Each Client program is designed to work with one or more specific
kinds of Server programs, and each Server requires a specific kind of Client. A Web Browser
is a specific kind of Client.
A cable that wires a pin to its opposite pin, for example, RX+ is wired to TX+. This cable
crossover
connects two similar devices, for example, two data terminal equipment (DTE) or data
Ethernet
communications equipment (DCE) devices.
cable
Channel Service Unit/Data Service Unit. CSUs (channel service units) and DSUs (data
CSU/DSU
service units) are actually two separate devices, but they are used in conjunction and often
combined into the same box. The devices are part of the hardware you need to connect
computer equipment to digital transmission lines. The Channel Service Unit device connects
with the digital communication line and provides a termination for the digital signal. The Data
Service Unit device, sometimes called a digital service unit, is the hardware component you
need to transmit digital data over the hardware channel. The device converts signals from
bridges, routers, and multiplexors into the bipolar digital signals used by the digital lines.
Multiplexors mix voice signals and data on the same line.
Data Communications Equipment is typically a modem or other type of communication
DCE
device. The DCE sits between the DTE (data terminal equipment) and a transmission circuit
such as a phone line.
Dynamic Host Configuration Protocol automatically assigns IP addresses to clients when they
DHCP
log on. DHCP centralizes IP address management on central computers that run the DHCP
server program. DHCP leases addresses for a period of time which means that addresses are
made available to assign to other systems.
For Frame Relay connections, DLCI (Data Link Connection Identifier) is a path number of a
DLCI
portion of the PVC (the DLCI changes for each hop through the network). It is a logical

Glossary

Prestige 681 SDSL Router
Glossary
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