Technical data

158 Theoretical and general applications www.westermo.com
UDP User Datagram Protocol is responsible for delivering data from
one device to another. UDP usually uses IP to pass data but
unlike TCP does not enable the message to be broken down into
packets that can be correctly re-assembled at the destination.
Therefore, the application using UDP must have the ability to
detect that the message or data has been correctly received.
However, UDP has an advantage of passing data faster and with
less overhead when compared with TCP. UDP is ideal for applica-
tions where small amounts of data are to be passed quickly.
Unintelligent Cannot save data about itself, for example, its own address
equipment on a network. Examples of unintelligent equipment are basic I/O-
devices, transducers, sensors, measurement instruments, etc.
Unix Multi-user system for mainframes and minicomputers that can
manage many processes simultaneously.
V.24 American standard, serial communication.
WAN A Wide Area Network is a geographically dispersed communica-
tions network.
Watchdog A monitoring circuit for supervision and automatic resetting of
modem functions.
VN4 French standard for ISDN connections.
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