IBM System/36 Maintenance Information Manual page 145

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