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User Manual of VC-230/230N
UDP
User Datagram Protocol - A connectionless transport protocol that runs on top of TCP/IP's IP. UDP, like TCP,
uses IP for delivery; however, unlike TCP, UDP provides for exchange of datagram without acknowledgments
or guaranteed delivery. Best suited for small, independent requests, such as requesting a MIB value from an
SNMP agent, in which first setting up a connection would take more time than sending the data.
UNI signaling
User Network Interface signaling for ATM communications.
Virtual Connection (VC)
A link that seems and behaves like a dedicated point-to-point line or a system that delivers packets in
sequence, as happens on an actual point-to-point network. In reality, the data is delivered across a network
via the most appropriate route. The sending and receiving devices do not have to be aware of the options and
the route is chosen only when a message is sent. There is no pre-arrangement, so each virtual connection
exists only for the duration of that one transmission.
WAN
Wide area network - A data communications network that spans any distance and is usually provided by a
public carrier (such as a telephone company or service provider).
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