IBM 3745 Problem Determination Manual page 378

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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.
addressing. A te<;hnique where the control station
selects, among the DTEs that share a transmission
line,. the· DTE to which it is going to send a message.
alarm. A message sent to the MOSS 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.
auto-call. A machine feature that allows a DCE to
initiate a call automatically over a switched line.
autoBER. A program
to
automatically analyse a BER
file.
binary synchronous communication (BSC). A uniform
procedure, using 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.
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.
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.
© Copyright
I BM
Corp.
1988, 1992
channel interface. The interface between the
controller and the host processors.
communication common carrier. In the USA and
Canada, a public data transmission service that
provides the general public with transmission service
facilities. For example, a telephone or telegraph
company (see also post telephone and telegraph for
countries outside the USA and Canada).
communication controller. A communication control
unit that is controlled by one or more programs
stored and executed in the unit. Examples are the
IBM 3705, IBM 3725/3726, IBM 3720, and IBM 3745.
communication network management (CNM)
application program. An ACFIVTAM application
program authorized to issue formatted management
services request units containing physical-unit-related
requests and to receive formatted management
services request units containing information from
physical units.
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.
configuration data file (CDF). A MOSS file that
contains a description of all the hardware features
(presence, type, address, ·and characteristics).
control panel. A panel that contains switches and
indicators for the use of the customer's operator and
service personnel.
control program. A computer program designed to
schedule and to supervise the execution of programs
of the controller.
control subsystem (CSS). The part of the controller
that stores and executes the control program, and
monitors the data transfers over the channel and
transmission interfaces.
data circutt-terminating equipment (DC E). The
equipment installed at the user's premises that
provides all the functions required to establish,
maintain, and terminate a 90nnection, and the signal
conversion and coding between the data terminal
equipment (DTE) and the line. For example, a modem
is a DeE (see modem.)
Note: The DCE may be separate equipment or an
integral part of .other equipment.
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