Glossary-6 Sun Ultra 45 and Ultra 25 Workstations Service and Diagnostics Manual • May 2006
P
PCI Peripheral component interconnect. A high-performance 32- or 64-bit-wide bus
with multiplexed address and data lines.
PCI-Express Peripheral Component Interconnect Express. A scalable I/O serial bus
technology with greater bandwidth than PCI and PCI-X.
PCI-X An improvement to the PCI bus.
peripheral Removable media assembly. A device such as a smart card reader, CD-ROM
drive, DVD-ROM drive, 4-mm tape drive, or a diskette drive.
PHY Physical access layer. Part of the digital-to-analog connection between the
MAC and the physical Ethernet wire.
PID Process ID.
POR Power-on reset.
POST Power-on self-test. A series of tests that verify motherboard components are
operating properly. Now initiated with the post command.
PROM Programmable read-only memory. After the PROM has been programmed, it
cannot be reprogrammed. See flash PROM.
R
registered DIMM A DIMM that includes a register buffer.
RISC Reduced instruction set computer. A computer using the RISC architecture.
S
SAS Serial attached SCSI.
SATA Serial ATA.
SCSI Small computer system interface.
SDR Single data rate.
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