Glossary
D-5
interposer
. The part used to convert a 68-pin connector
to a 50-pin D-shell connector.
intervention required
. Manual action is needed.
INTRO
. Introduction.
I/O
. Input/output.
IOP
. Input/output processor.
IP
. Internet protocol
IPL
. Initial program load.
IPsec (IP security)
. A set of protocols for securing
network communications by authentication and
encryption.
IPv4
. Fourth iteration of the Internet Protocol (IP), and
dominant network layer protocol on the internet.
IPv6
. Network layer protocol and designated successor
to the IPv4 protocol, due mainly to the increased number
of addresses available for networked devices.
ITDT
. IBM TotalStorage Diagnostic Tool.
ITST
. Idle-time self-test.
K
kilogram (kg)
. One thousand grams (approximately
2.2 pounds).
km
. kilometer. 1000 Meters, Approximately 5/8 mile.
L
LAN
. Local area network. A computer network within
a limited area.
LCD
. See
liquid crystal display
.
LDAP
. Lightweight Directory Access Protocol. This
allows the library to use login and password information
stored on a server to grant access to the library
functionality.
LDI
. Library Drive Interface.
LED
. Light-emitting diode.
library certification
. In cryptography, a certificate
provided by the library.
library-managed encryption
. Tape encryption
controlled by the tape library.
liquid crystal display (LCD)
. A low-power display
technology used in computers and other I/O devices.
loadable
. Having the ability to be loaded.
LVD
. SCSI Bus Low Voltage Differential
M
magnetic tape
. A tape with a magnetic surface layer on
which data can be stored by magnetic recording.
MAP
. Maintenance analysis procedure.
mask
. A pattern of characters that controls the
retention or elimination of portions of another pattern of
characters. To use a pattern of characters to control the
retention or elimination of portions of another pattern of
characters.
master file
. A file used as an authority in a given job
and that is relatively permanent, even though its
contents may change. Synonymous with main file.
MB
. Mega Byte (usually expressed as data rate in
MB/s or MB/second).
media capacity
. The amount of data that can be
contained on a storage medium, expressed in bytes of
data.
mega
. One million of.
meter
. In the Metric System, the basic unit of length;
equal to approximately 39.37 inches.
MIB
. Management Information Base. Information
repository used by SNMP.
micro
. One millionth of.
microcode
. (1) One or more micro instructions. (2) A
code, representing the instructions of an instruction set,
implemented in a part of storage that is not
program-addressable. (3) To design, write, and test one
or more micro instructions. (4) See also
microprogram
.
microdiagnostic routine
. A program that runs under
the control of a supervisor, usually to identify field
replaceable units.
microdiagnostic utility
. A program that is run by the
customer engineer to test the machine.
microinstruction
. A basic or elementary machine
instruction.
microprogram
. A group of microinstructions that
when executed performs a preplanned function. The
term microprogram represents a dynamic arrangement
or selection of one or more groups of microinstructions
for execution to perform a particular function. The term
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