TE Terminal Equipment.
Terminal Any device capable of sending and receiving information over a
communication channel. It is used to enter data into a computer
system and to communicate the outputs of the system to the
affected environment. Terminal devices include computers,
teleprinters, special keyboards, light displays, cathode-ray
tubes, thermocouples, pressure gauges and other
instrumentation, radar units, telephones, etc.
Time Slot An identifiable increment in the output of a multiplexing
scheme.
TMS Time Multiplexed Switch.
Transaction A computer-based message that represents a complete
unidirectional transfer of information between two points on a
data network.
TRFC30 30 Minute Traffic Report.
Trunk The communications circuit between two network nodes or
switches.
TSIU Time Slot Interchange Unit.
TTYC Teletypewriter Controller.
VCDX Very Compact Digital Exchange.
Virtual Call (VC) A user facility in which a call setup procedure and a call
clearing procedure determine a period of communication
between two data terminal equipments in which user data is
transferred in the network in the packet mode of operation. All
user data is delivered from the network in the same order in
which it is received by the network.
Virtual Circuit A logical, rather than physical, path for a call. For example, one
call’s packetized data may be sent over different physical paths
through a network to one destination.
Wide Area Network (WAN)
A high-volume data transmission facility interconnecting a
number of data devices, generally linking a building or a
campus.
Window The major element of the flow control mechanism used to
prevent the overload of a packet network. The window size
indicates the number of packets a given user can have
outstanding in the network at any given time.
X.25 A ITU-TS recommendation that specifies the interface between
data terminal equipment and data circuit terminating
equipment for terminals operating in the packet mode on public
data networks. This user to network interface includes physical,
frame, and packet levels of protocol. Network services provided
to the user across the X.25 interface currently include virtual
calls and permanent virtual circuits. Proposed revisions would
provide the transaction-oriented datagram and fast select
features.
235-200-150
May 2003
GLOSSARY
Issue 3.00 Page G-11
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