M. 1
048
576,
when making reference to a quantity
of
data or data storage.
See
also megabyte.
MAP. Maintenance analysis procedure.
Mb.
,1
048
576
bytes. (Mb may also
be
displayed
as MB.)
See
also megabyte.
megabyte. 1
000 000
bytes, when making reference
specifically to the storage
size
of
a disk storage
device.
See
also M and Mb.
MIM. Maintenance information manual.
MLCA. Multiline communications
attachment/adapter.
modifier. Something that modifies
or
changes.
modify. To change something.
Same as alter.
MPTF. Microprogram temporary
fix.
MS. Main storage.
MSP.
Main storage processor.
multidevice. More than one device.
multiline. More than one communications line.
multinational. More than one country.
multiple. More than one.
multipoint. In data communications, a network that
has more than one station.
~C.
Overcurrent.
occupied. Busy.
See
also DLO.
OV. Overvoltage.
overcurrent. A condition that occurs when power
supply current
is
too high.
overview. A summary.
overvoltage. A condition that occurs when power
supply voltage is too high.
panel.
See
I/O panel and control panel.
PEB. Processor error byte.
D-4
5363
Maintenance Information
PND. Present next digit.
POR.
Power-on reset.
problem determination. The process
of
identifying
why the system is not working. Often this process
identifies programs, hardware, data
communications equipment,
or
user errors as the
source
of
the problem.
program temporary fix. A temporary solution,or
bypass
of
a problem diagnosed by IBM service
representatives as a result
of
a defect in an existing
program.
See
also authorized program analysis
report
(AP
AR).
protocol. In SNA, the rules for transmitting and
receiving data.
PTF. Program temporary
fix.
PUMP.
Pack utility maintenance program.
R/W. Read/write.
RDS. Receive data space.
reflection. Part
of
a signal that returns to its source
because
of
a change in the impedance
of
the cable
in which the signal travels.
reload. To load programs again (as from
diskettes).
RETAIN. Remote technical assistance information
network.
retainer. a device used to prevent logic cards and
cables from becoming loose.
retry. An attempt to perform
an
operation a
specified number
of
times, or until the operation
is
completed.
See
also
AeR.
RFI. Radio frequency interference.
RNR. Receive not ready.
ROS. Read-only storage.
RPQ.
Request for price quotation.
RS-232-C. An EIA
intl;:rface specification.
RTR. Ready to receive.
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