Technical data

GL–12 Glossary
parity A method of checking if binary numbers or characters are correct by
counting the ONE bits. In odd parity, the total number of ONE bits must be
odd; in even parity, the total number of ONE bits must be even.
parity bit A binary digit added to a group of bits that checks to see if errors exist in
the transmission.
parity check A method of detecting errors when data is sent over a communications line.
With even parity, the number of ones in a set of binary data should be even.
With odd parity, the number of ones should be odd.
participating mode A mode within an L_Port that allows the port to participate in loop
activities. A port must have a valid AL_PA to be in participating mode.
PCM Polycenter Console Manager.
PCMCIA Personal Computer Memory Card Industry Association. An international
association formed to promote a common standard for PC card-based
peripherals to be plugged into notebook computers. The card commonly
known as a PCMCIA card is about the size of a credit card.
parity A method of checking if binary numbers or characters are correct by
counting the ONE bits. In odd parity, the total number of ONE bits must be
odd; in even parity, the total number of ONE bits must be even. Parity
information can be used to correct corrupted data. RAIDsets use parity to
improve the availability of data.
parity bit A binary digit added to a group of bits that checks to see if there are errors
in the transmission.
parity RAID See RAIDset.
partition A logical division of a container, represented to the host as a logical unit.
peripheral device Any unit, distinct from the CPU and physical memory, that can provide the
system with input or accept any output from it. Terminals, printers, tape
drives, and disks are peripheral devices.