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Bit Service.
The process of character assembly or disassem-
bly.
Buffer.
A temporary storage area for data.
Channel Adapter.
An IBM 3704 and 3705 hardware unit that
provides attachment of the IBM 3704 and 3705 to a System/360
or System/370 channel.
Character Service.
The process by which a character is
moved to a buffer from the storage area where it was assem-
bled.
Data Set.
A device which performs the
modulation/ demodulation and control functions necessary to
provide compatibility between business machines and commu-
nications facilities.
Duplex.
Simultaneous two-way independent (equal data rate)
transmission in both directions.
Full Duplex.
Same as Duplex.
Half Duplex.
Alternate, one way at a time, independent
transmission. Contrast with duplex.
Interrupt.
A halt in processing that allows processing to be
resumed at the place it left off.
Line Interface Base.
An IBM 3704 and 3705 hardware unit
that provides for the attachment of up to 16 communication
lines to the IBM 3704 and 3705.
Glossary
Line Set.
An IBM 3704 and 3705 hardware unit through
which one or two lines are attached to a line interface base.
MC)dem.
(1)
(MOdulator-DEModulator) A device that modu-
lates and demodulates signals transmitted over communication
facilities. (2) See also data set.
Telecommunication Lines.
Telephone and other communi-
cation lines that are used to transmit messages from one loca-
tion to another.
Telecommunications.
(1)
Pertaining to the transmission of
signals over long distances, such as by telegraph, radio, or
television. (2) Data transmission between a computing system
and remotely located devices via a unit that performs the neces-
sary format conversion and controls the rate of transmission.
Teleprocessing.
The processing of data that is received from
or sent to remote locations by way of telecommunication lines.
Terminal.
A teleprocessing device capable of transmitting or
receiving data (or both) over a communication line.
Transmission Code.
A code for sending information over
communication lines.
Transmission Control Unit.
A unit that provides the inter-
face between communication lines and a computer. The trans-
mission control unit interleaves the transfer of data from many
lines across a single channel to the computer.
Glossary 65
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