Glossary; Central Site Change Management - IBM 3174 Introduction Manual

Glossary
This glossary includes terms and definitions from the
IBM Dictionary of Computing: Information Processing,
Personal Computing, Telecommunications, Office
Systems, IBM-specific Terms, SC20-1699.
The terms in this glossary are defined here as they
apply to the 3174 Establishment Controller.
A
access method. A technique for moving data between
main storage and input/output devices.
adapter. A general term for a device that provides
some transitional function between two or more
devices.
American National Standard Code for Information
Interchange (ASCII). A standard code, using a coded
character set consisting of 7-bit coded characters (8
bits including parity check), used for information
interchange among data processing systems, data
communication systems, and associated equipment.
The ASCII set consists of control characters and
graphic characters.
application. The use to which an information
processing system is put, for example, a payroll
application, an airline reservation application, or a
network application.
application program. (1) A program written for or by a
user that applies to the user's work, such as a program
that does inventory control or payroll. (2) A program
uSed to connect and communicate with stations in a
network, enabling users to perform application-oriented
activities.
ASCII emulation. The ability of a 3270 display station
or printer to communicate with an ASCII host using the
DEC VT100 or IBM 3101 data stream.
asynchronous. (1) Without regular time relationship;
unexpected or unpredictable with respect to the
execution of program instructions. (2) In asynchronous
data transmissions, data characters may be sent or
received at any time; no modem clocking is used to
establish bit timing.
Asynchronous Emulation Adapter (AEA). In the 3174
Establishment Controller, an adapter that enables an
ASCII terminal to communicate with a 3270 host using
the 3270 data stream, an ASCII terminal to
communicate with an ASCII host through the 3174, and
a 3270 terminal to communicate with an ASCII host
using the DEC VT100 data stream or the IBM 3101 data
stream.
attach. To connect a device logically to a 3174
adapter, so that it can communicate over the network.
attachment feature. The circuitry by which a cable
from a local terminal or a modem for a remote terminal
is attached to a 3792 Auxiliary Control Unit or a 3791
Controller.
B
backbone. In a multiple-ring local area network, a
high-speed link to which the rings are connected by
means of bridges. A backbone may be configured as a
bus or as a ring.
balun. A transformer for connected balanced (for
instance, twisted pair) cables to unbalanced (for
instance, coaxial) cable by matching the electrical
characteristics of the cables.
binary synchronous communication (BSC). Data
transmission in which character synchronism is
controlled by timing signals generated at the sending
and receiving stations.
c
card. In the 3174 Establishment Controller, a unit of
electronic circuitry contained in a plastic casing (or
cassette) and providing the control unit with a
specialized function, for example, a Terminal Adapter
or an Encrypt/Decrypt Adapter.
Central site change management (CSCM). A function
of the 3174 microcode that tracks the microcode for
each controller in a network and, in conjunction with
NetView DM, electronically distributes and retrieves
microcode changes for each controller.
central site customizing. The process of tailoring
controller microcode for each controller in a network,
at the central site.
central site library. One or more Library disks that
contain customizing data and label information for the
controllers in a network.
channel-attached. Pertaining to attachment of devices
directly by data channels (I/O channels) to a computer.
Synonym for local. Contrast with
telecommunication-attached.
channel-to-channel adapter. A hardware device that
can be used to connect two channels on the same
computing system or on different systems.
Glossary
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