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GLOSSARY
trap - a program interrupt mechanism that automatically updates the state of
the network to remote network management hosts. The SNMP agent on the
switch supports these SNMP traps.
UBR (Unspecified Bit Rate) - a type of traffic that is not considered time-criti-
cal (e.g., ARP messages, pure data), allocated whatever bandwidth is avail-
able at any given time. UBR traffic is given a “best effort” priority in an ATM
network with no guarantee of successful transmission.
UDP (User Datagram Protocol) - the TCP/IP transaction protocol used for
applications such as remote network management and name-service access;
this lets users assign a name, such as “RVAX*2,S,” to a physical or numbered
address.
Unassigned Cells - a cell identified by a standardized virtual path identifier
(VPI) and virtual channel identifier (VCI) value, which has been generated
and does not carry information from an application using the ATM Layer service.
UNI (User-to-Network Interface) - the physical and electrical demarcation
point between the user and the public network service provider.
UNI 3.0 - the User-to-Network Interface standard set forth by the ATM Forum
that defines how private customer premise equipment interacts with private
ATM switches.
UTP (Unshielded Twisted Pair) - a cable that consists of two or more insu-
lated conductors in which each pair of conductors are twisted around each
other. There is no external protection and noise resistance comes solely from
the twists.
VBR (Variable Bit Rate) - a type of traffic that, when sent over a network, is
tolerant of delays and changes in the amount of bandwidth it is allocated
(e.g., data applications).
VC (Virtual Channel (or Circuit)) - a communications path between two
nodes identified by label rather than fixed physical path.
VCC (Virtual Channel Connection) - a unidirectional concatenation of VCLs
that extends between the points where the ATM service users access the ATM
Layer. The points at which the ATM cell payload is passed to, or received
from, the users of the ATM Layer (i.e., a higher layer or ATMM-entity) for
processing signify the endpoints of a VCC.
VCI (Virtual Channel Identifier) - the address or label of a VC.
VCL (Virtual Channel Link) - a means of unidirectional transport of ATM
cells between the point where a VCI value is assigned and the point where
that value is translated or removed.