Xpeed 320R, User Manual

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Glossary
X320R User’s Guide 99
Demarcation point - The point at the customer premises where the line from the
telephone company meets the premises wiring. From the demarcation point, the
end-user is responsible for the wiring.
DHCP (Dynamic Host Configuration Protocol) - A TCP/IP protocol that enables
a network connected to the Internet to assign a temporary IP address to a host
automatically when the host connects to the network. With dynamic addressing, a
device can have a different IP address every time it connects to the network.
DHCP server - The server that assigns temporary IP addresses to a computer
when it connects to the Internet.
DLCI (Data Link Connection Identifier) - The frame relay virtual circuit number
used in internetworking to denote the port to which the destination LAN is
attached.
DNS (Domain Name System) - An Internet service that translates domain names
into IP addresses. For example, Xpeed.com will translate to 209.141.176.155.
Domain name - A name that identifies an IP address. For example, the domain
name xpeed.com represents the IP address 209.141.176.155. Domain names are
used in URLs to identify particular web pages.
Downstream - The direction of data flow on a data communications link, which
occurs from the network down to the user. Typically used in conjunction with
Upstream.
DSLAM (Digital Subscriber Line Access Multiplexer) - A CO platform for DSL
modems that provides high-speed data transmission and optional POTS service
simultaneously over traditional twisted-pair wiring.
Dynamic IP address - The address that the DHCP server assigns to the computer
when the computer connects to the Internet.
Dynamic routing - The process of real-time routing changes in response to net-
work changes. Dynamic routing software adjusts routes based on the routing
update messages it receives, then distributes update messages about its new
routes.
Encapsulation method - A method for transmitting multiple protocols within a
particular network.
Ethernet - A type of network used to connect devices at speeds up to 10/100
Mbps. Based on Carrier Sense Multiple Access/Collision Detection (CSMA/CD),