
434 Glossary
Enterprise Edge Programming Operations Guide P0911588 Issue 01
U
UDP
See User Datagram Protocol.
Unsupervised line
A line for which disconnect supervision is disabled. If an external caller hangs up,
the system does not detect the disconnection and does not hang up its line. See
Disconnect Supervision.
User Data
User Data is an option in the Set Copy feature. User Data refers to the personal
settings that are unique to an individual telephone, and are not programmed for the
system. User Data is programmed at each telephone.
These settings, for example, include Personal Speed Dial and the assignment of
programmable memory buttons.
User Datagram Protocol (UDP)
The UDP is a protocol that offers a limited amount of service when messages are
exchanged between computers in a network that uses IP. UDP is an alternative to
the Transmission Control Protocol (TCP) and, together with IP, is sometimes
referred to as UDP/IP.
Like the Transmission Control Protocol, UDP uses IP to actually transfer a data unit
(calleda datagram) fromonecomputertoanother. Unlike TCP, however, UDP does
not provide the service of dividing a message into packets (datagrams) and
reassembling it at the other end. Specifically, UDP doesn't provide sequencing of
the packets that the data arrives in. This means that the application program that
uses UDP must be able to make sure that the entire message has arrived and is in
the right order.
Network applications that want to save processing time because they have very
small data units to exchange (and therefore very little message reassembling to do)
may prefer UDP to TCP. The Trivial File Transfer Protocol (TFTP) uses UDP
instead of TCP.
User Filter
See Restriction filter.
User Preferences
A programming section that lets you assign autodialers, user speed dial codes,
display contrast, and other settings to a specific telephone or person. You do not
have to program these settings at the person’s telephone. User preferences are
assigned in Terminals and Sets programming.
Commentaires sur ces manuels