AOpen AOR-401 User Manual page 31

enter the public ports associated with the trigger port to open them for
inbound traffic.
TCP (Transmission Control Protocol) - A method (protocol)
used along with the Internet Protocol (Internet Protocol) to send
data in the form of message units between computers over the
Internet. While IP takes care of handling the actual delivery of
the data, TCP takes care of keeping track of the individual units
of data (called packets) that a message is divided into for
efficient routing through the Internet.
UDP (User Datagram Protocol) - A communications method
(protocol) that offers a limited amount of service when
messages are exchanged between computers in a network that
uses the Internet Protocol (IP). UDP is an alternative to the TCP
and, together with IP, is sometimes referred to as UDP/IP. Like
the Transmission Control Protocol, UDP uses the Internet
Protocol to actually get a data unit (called a datagram) from one
computer to another. 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.
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