ProSoft Technology PLX81-EIP-61850 - Manual (Page 163)

PLX8x-EIP-61850 ♦ Communication Gateway Glossary of Terms
Server to
IEC 61850 Client User Manual
ProSoft Technology, Inc. Page 163 of 167
July 2, 2015
U
Unicast/Point to Point
Communication between a server and a single Client.
Unified Modeling Language
Standardized constructs and semantics for diagrams, including state machines,
which are used to describe/specify the functionality of an IED, object model or a
process.
Unsolicited Data or Unsolicited Message
Data or message which is supplied to a Client from a server without the Client
subscribing to that data or message, for example: reset, abort, time. Does not
require a connection to be established.
Utility Communications Architecture
Describes the concepts of standardized models for power system objects.
W
Witness Point
Point, defined in the appropriate document, at which an inspection takes place on
an activity. The activity may proceed without the approval of the initiator of the
conformance test. The test facility must provide a written notice to the initiator at
an agreed time prior to the witness point. The initiator or his representative has
the right, but is not obligated, to verify the witness point.