diskette directory.
An
area
of
a diskette
that
contains the addresses
of
all records
on
the diskette.
DLO.
Data
line occupied.
DMR.
Data
modem ready.
DPR.
Digit present.
DSA.
Data
storage attachment/adapter.
DSKTEST. Diskette test (procedure).
DSR.
Data
set ready.
DTE.
Data
terminal equipment.
DTR.
Data
terminal ready.
dump. (1)
To
copy the contents
of
all
or
part
of
storage, usually from storage
to
an
output
device.
(2)
Data
that
has been dumped.
duplex. A
data
communications network
that
permits
data
communications
in
opposite directions
at
the same time. See also
half
duplex.
EIA. Electronic Industries Association.
enclosure. See disk enclosure ( D
E)
.
ERAP.
Error
recording analysis procedure.
fix. See
MPTF
and
PTF.
free-lance.
To
diagnose machine problems with
minimum instructions.
FRU. Field-replaceable unit.
full duplex. Same as duplex.
half duplex. Permitting
data
communications
in
opposite directions,
but
not
at
the same time. See
also duplex.
Help. (1) A key
on
work
station keyboards. (2) A
display
that
gives additional information
about
the
task
you
are performing. (3) A system procedure
that
displays a sequence
of
menus associated with
system tasks.
hex. Hexadecimal.
1/0
panel.
An
area
of
a machine where
I/O
cables
are connected to the system. This area is accessible
to the customer.
ICF. Interactive communications feature.
ID. Identifier.
identifier. A label
or
name
that
identifies
something.
IL.
Interrupt
level.
ILBB.
Interrupt
level backup byte.
1M. Integrated modem.
initial program load. A sequence
of
events
that
loads the system programs
and
prepares the system
to
run
jobs.
IPL.
Initial
program
load.
K. 1024, when making reference to a quantity
of
data
or
data
storage.
Kb. 1024 bytes.
(Kb
may also be displayed as
KB.)
LAN. Local area network.
line filter. A device used
to
prevent ripple
or
electrical noise
on
the
AC
power source from
reaching machine power supplies
and
to
prevent
ripple
or
electrical noise generated by a machine
from reaching the
AC
power source.
local storage register. A register used for
general-purpose storage.
log. (1) A document containing written entries. (2)
A system record containing recorded entries. (3)
To
write
or
record
an
entry in a log.
logged. Having written
or
recorded
an
entry
in
a
log.
loopback test. A test
in
which signals are looped
from a test unit,
through
a
data
set
or
loopback
switch,
and
back to the test unit for measurement.
LPDA.
Link Problem Determination Aid.
LSR.
Local storage register.
Appendix D. Glossary D-3
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