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IBM 3270 User Guide

IBM 3270
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I
Glossary
active.
Able
to
communicate
on
the
network.
An
adapter
is
active
If
It
Is
able
to
pass
tokens
on
the
network.
adapter.
A
general
term
for
a
device
that
provides
some
transitional
function
between
two
or
more
devices.
address.
(1)
A
value
that
identifies
a
register,
a
particular
part
of
storage,
a
data
source,
or
a
data
sink.
The
value
Is
represented
by
one
or
more
characters.
(2)
To
refer
to
a
device
or
an
Item
of
data
by
Its
address.
(3)
In
word
processing,
the
location.
Identified
by
an
address
code,
of
a
specific
section
of
the
recording
medium
or
storage.
(4)
The
location
In
the
storage
of
a
computer
where
data
is
stored.
(5)
In
data
communication,
the
unique
code
assigned
to
each
device
or
work
station
connected
to
a
network.
alternate
cursor.
(1)
An
Image
reversal
of
each
dot
In
the
character
cell
at
the
cursor
position.
(2)
A
cursor
other
than
the
one
displayed
on
the
display
surface
at
power
on
time.
application.
The
use
to
which
an
information
processing
system
Is
put,
for
example,
a
payroll
application,
an
airline
reservation
application,
or
a
network
application.
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
data
streams,
such
as
the
DEC
VT100
data
stream
or
the
IBM
3101
data
stream.
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.
attribute.
(1)
A
characteristic.
(2)
A
terminal
display
language
or
transformation
definition
language
(TDL)
keyword
that
specifies
a
particular
quality
for
the
TDL
object
with
which
It
Is
associated.
audible
alarm.
(1)
An
alarm
that
Is
sounded
when
designated
events
occur
that
require
operator
attention
or
Intervention
before
system
operation
can
continue.
(2)
A
special
feature
that
sounds
a
short,
audible
tone
automatically
when
a
character
Is
entered
from
the
keyboard
Into
the
next-to-last
character
position
on
the
screen.
The
tone
can
also
be
sounded
under
program
control.
central
site
customizing.
The
process
of
tailoring
control
unit
microcode
for
each
controller
In
a
network,
at
the
central
site.
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.
character
set.
(1)
A
defined
collection
of
characters.
(2)
A
group
of
characters
used
for
a
specific
reason,
for
example,
the
set
of
characters
a
printer
can
print.
(3)
The
collection
of
graphic
characters
required
to
support
a
specific
language.
command.
An
Instruction
that
directs
a
control
unit
or
device
to
perform
an
operation
or
a
set
of
operations.
communication
adapter.
(1)
A
circuit
card
with
associated
software
that
enables
a
processor,
controller,
or
other
device
to
be
connected
to
a
network.
(2)
See
EIA
communication
adapter,
V.35
communication
adapter,
and
X.21
communication
adapter.
Concurrent
Communication
Adapter
(CCA).
In
the
3174
Establishment
Controller,
a
communication
adapter
that,
along
with
the
necessary
microcode,
provides
terminals
attached
to
the
3174
the
ability
to
concurrently
access
an
additional
3270
host.
configuration.
The
arrangement
of
a
computer
system
or
network
as
defined
by
the
nature,
number,
and
chief
characteristics
of
Its
functional
units.
More
specifically,
the
term
configuration
may
refer
to
a
hardware
configuration
or
a
software
configuration.
See
also
system
configuration.
control
character.
(1)
A
character
whose
occurrence
In
a
particular
context
specifies
a
control
function.
(2)
A
character
used
to
specify
that
a
control
unit
Is
to
perform
a
particular
operation.
'
Copyright
IBM
Corp.
1983,1990
X-3

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IBM 3270 Specifications

General IconGeneral
BrandIBM
Model3270
CategoryDesktop
LanguageEnglish

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