IBM ThinkPad 130, Introduction Manual, Page: 87 / 104

Glossary
This glossary defines all new terms used in this manual.
It also includes terms and definitions from the
IBM
Dictionary of Computing, SC20-1699. If you do not find
the term you are looking for, refer to the index or to the
IBM Dictionary of Computing.
alarm. A message sent to the MOSS operator
console. In case of an error, a reference code identifies
the nature of the error.
alert. A message sent to the host console. In case of
an error, a reference code identifies the nature of the
error.
asynchronous transmission. Transmission in which
each character is individually synchronized, usually by
the use of start and stop elements. The start-stop link
protocol, for example, uses asynchronous transmission.
Contrast with
synchronous transmission.
auto-answer. A machine feature that allows a DCE to
respond automatically to a call that it receives over a
switched line.
autoBER. A program that automatically analyzes a
BER file.
auto-call. A machine feature that allows a DCE to
initiate a call automatically over a switched line.
availability. The degree to which a system or resource
is ready when needed to process data.
Bell 212A. Bell recommendations on transmission
interface
binary synchronous communication (BSC). A
uniform procedure, using a standardized set of control
characters and character sequences, for synchronous
transmission of binary-coded data between stations.
box event record (BER). Information about an event
detected by the controller. It is recorded on the
disk/diskette and can be displayed on the operator
console for event analysis.
Note: The word box is used instead of controller to
contrast with the network in which the controller is only
a component.
block multiplexer channel. A multiplexer channel that
interleaves blocks of data. See also byte multiplexer
channel. Contrast with
selector channel.
byte multiplexer channel. A multiplexer channel that
interleaves bytes of data. See also block multiplexer
channel. Contrast with
selector channel.
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cache. A high-speed buffer storage that contains
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frequently accessed instructions and data and currently
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processed; it is used to reduce access and processing
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times.
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callout. A serial auto-call command that allows a DCE
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to initiate a call automatically over a switched line.
central control unit (CCU). In the 3745, the controller
hardware unit that contains the circuits and data flow
paths needed to execute instructions and to control its
storage and the attached adapters.
channel adapter (CA). A communication controller
hardware unit used to attach the controller to a host
processor.
channel interface. The interface between the
controller and the host processors.
clear channel. Mode of data transmission where the
data passes through the DCE and network, and arrives
at the receiving communication controller (for example,
the IBM 3745) unchanged from the data transmitted.
The DCE or network can modify the data during
transmission because of certain network restrictions, but
must ensure the received data stream is the same as
the transmitted data stream.
command list. In the NetView program, a sequential
list of commands and control statements that is
assigned a name. When the name is invoked (as a
command), the commands in the list are executed.
communication common carrier. In the U.S.A. and
Canada, a public data transmission service that
provides the public with transmission service facilities.
For example, a telephone or telegraph company (see
also
Post, Telephone and Telegraph for countries
outside the U.S.A. and Canada).
communication controller. A communication control
unit that is controlled by a program stored and executed
in the unit. Examples are the IBM 3705, IBM
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3725/3726, IBM 3720, and IBM 3745 models
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210/310/410/610.
communication scanner. See scanner.
communication scanner processor (CSP). The
processor of a scanner.
communication subsystem. The part of the controller
that controls the data transfers over the transmission
interface.
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Copyright IBM Corp. 1989, 1991
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