IBM B-Series, Maintenance Information

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N
N/A. Not applicable.
node. In a network, a point at which one or more
functional units connect channels or data circuits.
NVS. Nonvolatile storage. A storage device whose
contents are not lost when power is cut off.
O
OEM. Original equipment manufacturer.
offline. Pertaining to the operation of a functional unit
without the continual control of a computer. Contrast
with
online.
online. Pertaining to the operation of a functional unit
that is under the continual control of a computer.
Contrast with
offline.
OPER. Operation.
ov. Over voltage.
overrun. Loss of data because a receiving device is
unable to accept data at the rate it is transmitted.
overtightening. To tighten too much.
P
parameter. A variable that is given a constant value
for a specified application and that may denote the
application.
PCC. Power control compartment.
PE. Product engineer.
PGID. Path group identification.
PM. Preventive maintenance.
POR. Power-on reset.
port. A physical connection for communication
between the 3570 and the host processor. The 3570
has one SCSI port.
POST. Power-on self-test.
Power-on self-test (POST). A series of diagnostic
tests that are run automatically by a device when the
power is turned on.
PROM. Programmable read only memory.
PS. Power supply.
PTF. Program temporary fix.
PWR. Power.
R
RACL. Random access cartridge loader.
RAM. Random access memory.
Random access memory. A storage device into
which data is entered and from which data is retrieved
in a nonsequential manner.
RAS. Reliability, availability, and serviceability.
record. A collection of related data or words, treated
as a unit.
recording density. The number of bits in a single
linear track measured per unit of length of the recording
medium.
recoverable error. An error condition that allows
continued execution of a program.
ref. Reference.
reg. Register.
reinventory. To inventory again.
retension. The process or function of tightening the
tape onto the cartridge or cassette if it is sensed that
the tape has a loose wrap on the cartridge or cassette.
RPQ. Request for price quotation.
R/W. Read/write.
S
s. Seconds of time.
SCSI. Small computer system interface.
segment. A part.
sel. Select.
serialize. To change from parallel-by-byte to
serial-by-bit.
serializer. A device that converts a space distribution
of simultaneous states representing data into a
corresponding time sequence of states.
SIM. Service information message.
GLOSSARY
Glossary
Gloss-5