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Glossary
Avaya P460 Reference Guide 199
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.)
Edge Device
A device used to take frames from LANs and send them over an ATM network as
cells. An edge device normally provides LAN emulation.
ELAN
Emulated LAN. A technique that specifies the interfaces and protocols needed for
providing LAN-supported functionality and connectivity in an ATM environment.
This enables legacy protocols to be interoperable with ATM protocols, interfaces,
and devices.
Emulated LAN
A technique that specifies the interfaces and protocols needed for providing LAN-
supported functionality and connectivity in an ATM environment. This enables
legacy protocols to be interoperable with ATM protocols, interfaces, and devices.
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.