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Glossary
GL-2
8000-A2-GB26-10
January 1999
Central Processing Unit. The main or only computing device in a data processing system.
Cyclic Redundancy Check. A mathematical method of confirming the integrity of received
digital data.
The address used for routing packets whose destination is not in the routing table. In
Routing Information Protocol (RIP), this is IP address 0.0.0.0.
Dynamic Host Configuration Protocol. A Microsoft protocol for dynamically allocating IP
addresses.
A system that detects and forwards DHCP discover or request messages to the
appropriate DHCP server.
A server which uses DHCP to allocate network addresses and deliver configuration
parameters to dynamically configured hosts.
A named group of machines on a network. In IP, a domain consists of a block of IP
addresses with similar prefixes.
In the direction of the customer premises.
Digital Subscriber Line. DSL is a copper loop transmission technology enabling high-speed
access in the local loop.
Digital Subscriber Line Card. The primary card in the Hotwire DSLAM system. It has one
Ethernet port and four DSL ports.
Digital Subscriber Line Access Multiplexer. DSLAM provides simultaneous high-speed
digital data access and analog POTS over the same twisted-pair telephone line.
Data Service Unit/Channel Service Unit. A device that combines the functions of a DSU
and a CSU. It connects Data Terminal Equipment to the digital network, protects the line
from damage, and regenerates the signal.
Name of the DSL card’s and MCC card’s 10BaseT (Ethernet) interface.
MIB objects unique to a specific company’s devices.
A type of network that supports high-speed communication among systems. It is a
widely-implemented standard for LANs. All hosts are connected to a coaxial cable where
they contend for network access using a Carrier Sense, Multiple Access with Collision
Detection (CSMA/CD) paradigm.
A six-part hexadecimal number in which a colon separates each part (for example,
8:0:20:1:2f:0). This number identifies the Ethernet communications board installed in a PC
and is used to identify the PC as a member of the network.
A rule or set of rules applied to a specific interface to indicate whether a packet can be
forwarded or discarded.
Software that has been temporarily or permanently loaded into read-only memory.
File Transfer Protocol. A TCP/IP standard protocol that allows a user on one host to
access and transfer files to and from another host over a network, provided that the client
supplies a login identifier and password to the server.
The capability to transmit in two directions simultaneously.
The subnet that the end-user system is on.
The capability to transmit in two directions, but not simultaneously.
High-Level Data Link Control. A communications protocol defined by the International
Standards Organization (ISO).
CPU
CRC
default route
DHCP
DHCP Relay Agent
DHCP Server
domain
downstream
DSL
DSL card
DSLAM
DSU/CSU
e1a
Enterprise MIB
Ethernet
Ethernet address
filter
firmware
FTP
full-duplex
gateway address
half-duplex
HDLC