Panasonic 1200N - Manual (Page 244)

U Glossary
B-82 Centillion 1200N ATM Switch User Manual
NTP 297-8103-903
UME
UNI Management Entity: The software residing in the ATM devices at each end of
the UNI circuit that implements the management interface to the ATM network.
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-Network Interface: An interface point between ATM end users and a private
ATM switch, or between a private ATM switch and the public carrier ATM
network; defined by physical and protocol specifications per ATM Forum UNI
documents. The standard adopted by the ATM Forum to define connections
between users or end stations and a local switch.
Unicasting
The transmit operation of a single PDU by a source interface where the PDU
reaches a single destination.
UPC
Usage Parameter Control: Usage Parameter Control is defined as the set of actions
taken by the network to monitor and control traffic, in terms of traffic offered and
validity of the ATM connection, at the end-system access. Its main purpose is to
protect network resources from malicious as well as unintentional misbehavior,
which can affect the QoS of other already established connections, by detecting
violations of negotiated parameters and taking appropriate actions.
Uplink
Represents the connectivity from a border node to an up node.
Upnode
The node that represents a border node's outside neighbor in the common peer
group. The upnode must be a neighboring peer of one of the border node's
ancestors.
UT
Upper Tester: The representation in ISO/IEC 9646 of the means of providing,
during test execution, control and observation of the upper service boundary of the
IUT, as defined by the chosen Abstract Test Method.