Configuring Systems for Terminals, Printers, and Other Serial Devices (32022-90051)

Glossary 245
Glossary
signal events per second. When
one bit represents each signal
change, baud is the same as “bits
per second.”
binary mode A data-transfer
scheme in which no special
character processing is
performed. All characters are
considered to be data and are
passed through with no control
actions being taken.
bit Binary digit. A unit of
information that designates one
of two possible states, which are
represented by either 1 or 0.
block mode A terminal
processing mode in which groups,
or “blocks,” of data are
transmitted all at once.
BNC T-Connector A connector
used to connect a computer or a
component such as a DTC to the
LAN in a ThinLAN configuration.
boundary See network
boundary.
bps Bits per second. The number
of bits passing a point per second.
bridge A device that is used to
connect LAN segments.
broadcast Communication
method of sending a message to
all devices on a link
simultaneously.
buffer A logical grouping of a
system's memory resources used
by NS 3000/iX.
byte A sequence of eight
consecutive bits operated on as a
unit.
C
call In X.25, a call is an attempt
to set up communication between
two DTEs using a virtual circuit.
Also known as a virtual call.
call collision A conflict that
occurs at a DTE/DCE interface
when there is a simultaneous
attempt by the DTE and DCE to
set up a call using the same
logical channel identifier.
called address When a node
sends out a call request packet,
the packet contains the address of
the destination node. The address
of the destination node is the
called address.
calling address When a node
receives an incoming call packet,
the packet contains the address of
the sending node. The address of
the sending node is the calling
address.
carrier A continuous wave that
is modulated by an
information-bearing signal.
catenet See internetwork.
CCITT Consultative Committee
for International Telephony and
Telegraphy. An international
organization of communication
carriers, especially government
telephonemonopolies,responsible
for developing telecommunication