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Glossary
different IP address every time it connects to the network. In some systems, the
device's IP address can even change while it is still connected. DHCP also supports
a mix of static and dynamic IP addresses.
Domain
A group of computers and devices on a network that are administered as a unit with
common rules and procedures.
Dot1Q
Standard for VLAN tagging under the IEEE 802.1Q VLAN standard.
DRU
Domain Resource Unit. The unit of measure of resources available in a Avaya M770
Device DomainX.
Duplex Mode
The state of the device with regard to simultaneous transmission and reception of
information. In Full Duplex Mode, the device or circuit permits simultaneous
transmission and reception. (This is also known as bisynchronous communication.)
In Half Duplex Mode, the device or circuit does not permit simultaneous
transmission and reception. (This is also known as asynchronous communication.)
End System
An end-user device on a network. Also used to denote a non-routing host or node in
an OSI network.
ESI
End System Identifier. A portion of a network address that identifies the end
system.
Ethernet
One of the most widely implemented LAN standards, Ethernet is standardized as
IEEE 802.3. Ethernet uses the CSMA/CD access method to handle simultaneous
demands and supports data transfer rates of 10 Mbps. A newer version of Ethernet,
called 100Base-T (or Fast Ethernet), supports data transfer rates of 100 Mbps. The
newest version, Gigabit Ethernet, supports data rates of 1 Gigabit per second.
FCS
Frame Check Sequence. A field added to a frame for error-control purposes.
FDDI
Fiber Distributed Data Interface. A set of ANSI protocols for sending digital data
over fiber optic cable. FDDI networks are token-passing networks, and support data
rates of up to 100 Mbps. FDDI networks are typically used as backbones for wide-
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Avaya C460 Reference Guide
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