Tunneling
Technology for connecting two networks via a third network, whereby the through traffic is completely
isolated from the traffic of the third network.
UDP
See User Datagram Protocol.
Unbuffered Report Control Block
Unbuffered Report Control Block (URCB) is a form of report controlling. Internal events trigger the immediate
sending of reports based on best effort. If no association exists or if the transport data flow is not fast
enough, events can be lost.
URCB
See Unbuffered Report Control Block
USART
Universal Synchronous/Asynchronous Receiver/Transmitter
User Datagram Protocol (UDP)
UDP is a protocol. The same as TCP, the protocol is based on IP. In contrast to this, however, UDP works
without a connection and does not have any safety mechanisms. The advantage of UDP in comparison to IP is
the higher transmission rate.
UTC
Universal Time Coordinated
Value Indication
Value indications are single-point indications in which a further value is transferred in addition to the actual
indication (example: Fault locator : Here the distance to the fault point is also indicated in addition to the
fault statement Yes/No.)
Virtual Bay Device
A virtual bay device comprises all communication objects, as well as their properties and states, which a
communication user can utilize in the form of services.
Virtual Device
A VD (Virtual Device) includes all communication objects as well as their properties and stages available to
communication users in form of services. A VD can be a physical device, a module of a device or a software
module.
WYE
DEL (phase-to-ground related measurements of a 3-phase system)
Glossary
SIPROTEC 5, High-Voltage Bay Controller, Manual 1251
C53000-G5040-C015-9, Edition 11.2017
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