Technical data

www.westermo.com Theoretical and general applications 157
Star network A network built from a central unit, with direct lines to the
connected units.
Start bit Denotes the beginning of data transfer. With asynchronous
transfer each character is preceded by a start bit.
Status signal Reports the status of the connected equipment, for example,
switched on, ready to receive, ready to send.
Stop bit One or more stop bits denote that the character is finished.
Switch Switch, manually or software controlled that redirects the
data traffic.
Synchronous Transfer, characters are sent and received in a single sequence
at a constant rate. The rate is controlled by clock signals.
TCP Transmission Control Protocol is responsible for delivering and
verifying data from device to device.The protocol detects errors
or lost data and can also trigger a re-transmission until the data is
correctly and completely received.
TCP/IP Transmission and Control Protocol/Internet Protocol, developed
for the Internet, to interconnect several LANs in a WAN to per-
mit the exchange of data irrespective of the source, with the help
of, among others, a routing protocol.TCP/IP, which initially was
UNIX-based, is making ground as a network protocol even in
other environments.
TDM Time Division Multiplexing, where the channel is divided into time
slots which are allocated different sub-channels. See multiplexer.
Telephone Modem for communications via the telephone network.
modem
Terminal Subordinate unit without its own computing capacity to a main
computer or mainframe. Also a personal computer with its own
capacity can act as a terminal in some applications.
TFTP Trivial File Transfer Protocol. A further simple way to transfer files.
This protocol uses UDP/IP protocol to enable file transfer.
Topology Network configuration.
TP A Copper Twisted Pair Port.
Transients High current peaks, changes and distrurbances on the network.
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