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POR. Power on reset.
port. System hardware where the input/output
devices are attached.
POSIX. Portable operating system interface for
computer environments.
problem analysis. The process of finding the cause of
a problem.
problem isolation procedure. Written information
used by service representatives to repair IBM
equipment. A PIP contains questions and procedures
that direct the user to the failing part of the equipment.
protocol. A set of rules that controls the
communication and transfer of data between two or
more devices (or systems) in a communications
network.
PSP. Preventive service planning.
PTF. Program temporary fix. A temporary solution to,
or bypass of, a defect in a licensed program.
PWI. In data communications, power indicate.
RAM. Random access memory.
RAS. Reliability, availability, serviceability.
RC-GND. In data communications, receive circuit
ground.
RCLK. In data communications, receive clock.
RD. (1) In data communications, received data. (2)
Remove Directory (RD).
replace. To exchange; for example, to exchange one
part with another.
restore. To return to an original value or image; for
example, to restore data to main storage from auxiliary
storage.
RGND. In data communications, return ground.
RI. In data communications, ring indicate.
RISC. Reduced instruction set computer.
RLB. In data communications, remote loop back.
RLSD. In data communications, received line signal
(carrier) detector. See also CD.
ROS. Read only storage.
RPQ. Request for price quotation
RSET A, B. In data communications, receiver signal
element timing (A and B refer to each individual signal
of a differential pair of signals).
RTS. (1) In data communications, ready to send. (2)
Reliable transfer server.
SAG. Shared access group.
save media. Recorded and saved system data that is
generated by the save command.
SC-GND. In data communications, send circuit
ground.
SCPF. Start-control-program-function job.
SCS. See SNA character string.
SCSI. Small computer system interface.
SDLC. Synchronous Data Link Control
SGND. In data communications, signal ground.
shadow log. A portion of the product activity log that
is maintained by Licensed Internal Code.
SID. (1) Segment ID. (2) Subject identifier.
sign on. The procedure by which the user starts a
terminal session.
SLID. Error log ID (for error log entries).
SNA. See Systems Network Architecture.
SOM. System object model.
SP. Service processor.
SPCN. System power control network. An
asynchronous serial communications network. SPCN
connects the power system in participating components
to the operating system and can report critical changes
and power failures in those components to the
operating system. SPCN gives the operating system
control of electrical power.
SRC. See system reference code.
SSB. In data communications, select standby.
SST. System service tool.
STBY. In data communications, stand by.
storage management recovery. A function that
prepares the system to access data from all disk units
configured to the system.
subfunction. A set of functions that are contained in a
specific control panel function.
subset. A set of elements that are part of a specified
set.
Glossary of Terms and Abbreviations 329