Issue 2 - 07/00 A4-11
Appendix 4—Glossary & Abbreviations
Stop Bits The last bits sent in asynchronous transmission, to indicate
that the message is complete. In asynchronous serial data
transmission each character is sent between a start bit and
one or more stop bits. At the end of each character the
line goes into an idle state, known as marking. At the start
of the next character it activates again—the active state is
known as spacing. There is a minimum of 1, 1.5 or 2 stop
bits between characters, but the line may remain idle until
the next character is sent.
Synchronous A communication channel that can transmit timing
data channel information as well as data.
TA Terminal Adaptor. Used within ISDN to convert between
non-ISDN and ISDN references.
TE Terminal Equipment. Equipment providing the functions
which allow the user to operate the access protocols.
TE1 Terminal Equipment Type 1. A terminal with an ISDN
reference at reference points.
TE2 Terminal Equipment Type 2. A non-ISDN terminal, with
an interface at the R reference point. Any computer or
terminal equipment with an interface that conforms to a
CCITT X-series or V-series specification is a TE2.
TEI Terminal Endpoint Identifier. A unique identity given to
the terminal by the network.
Teleservice A type of telecommunication service that provides the
complete capability, including terminal equipment
functions, for communication between users according to
protocols established by agreement between
administrations and/or telecoms providers.
Teletex A data transmission standard, typically operating at 1200
bits, which is an upgrade on the slower telex standard.
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