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GLOSSARY
Switched Connection - a connection established via signalling.
Symmetric Connection - a connection with the same bandwidth value speci-
fied for both directions.
Synchronous - signals that are sourced from the same timing reference and
hence are identical in frequency.
Systems Network Architecture (SNA) - a proprietary networking architec-
ture used by IBM and IBM-compatible mainframe computers.
Tachometer - in ForeView, the tachometer shows the level of activity on a
given port. The number in the tachometer shows the value of a chosen param-
eter in percentage, with a colored bar providing a semi-logarithmic represen-
tation of that percentage.
TAXI - Transparent Asynchronous Transmitter/Receiver Interface
TC (Transmission Convergence) - generates and receives transmission
frames and is responsible for all overhead associated with the transmission
frame. The TC sublayer packages cells into the transmission frame.
TCP (Transmission Control Protocol) - a specification for software that bun-
dles and unbundles sent and received data into packets, manages the trans-
mission of packets on a network, and checks for errors.
TCP/IP (Transmission Control Protocol/Internet Protocol) - a set of commu-
nications protocols that has evolved since the late 1970s, when it was first
developed by the Department of Defense. Because programs supporting
these protocols are available on so many different computer systems, they
have become an excellent way to connect different types of computers over
networks.
TDM (Time Division Multiplexing) - a traditional digital multiplexing in
which a signal occupies a fixed, repetitive time slot within a higher-rate signal.
Token Ring - a network access method in which the stations circulate a token.
Stations with data to send must have the token to transmit their data.
topology - a program that displays the topology of a FORE Systems ATM net-
work. An updated topology can be periodically re-displayed by use of the
interval command option.
Traffic - the calls being sent and received over a communications network.
Also, the packets that are sent on a data network.
Trailer - the protocol control information located at the end of a PDU.
Transit Delay - the time difference between the instant at which the first bit of
a PDU crosses one designated boundary, and the instant at which the last bit
of the same PDU crosses a second designated boundary.