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114 Sun Fire V490 Server Administration Guide • August 2004
Reference for Terms in Diagnostic
Output
The status and error messages displayed by POST diagnostics and OpenBoot
Diagnostics tests occasionally include acronyms or abbreviations for hardware sub-
components.
TABLE 6-13 is included to assist you in decoding this terminology and
associating the terms with specific FRUs, where appropriate.
TABLE 6-13 Abbreviations or Acronyms in Diagnostic Output
Term Description Associated FRU(s)
ADC Analog-to-Digital Converter PCI riser board
APC Advanced Power Control – A function provided
by the SuperIO integrated circuit
PCI riser board
BBC Boot Bus Controller – Interface between the
processors and components on many other buses
Centerplane
CDX Data Crossbar – Part of the system bus Centerplane
CRC Cyclic Redundancy Check N/A
DAR Address Repeater – Part of the system bus Centerplane
DCDS Dual Data Switch – Part of the system bus CPU/Memory board
DMA Direct Memory Access – In diagnostic output,
usually refers to a controller on a PCI card
PCI card
EBus A byte-wide bus for low-speed devices Centerplane, PCI riser
board
HBA Host Bus Adapter Centerplane, various
others
I
2
C Inter-Integrated Circuit (also written as I2C) – A
bidirectional, two-wire serial data bus. Used
mainly for environmental monitoring and control
Various. See
TABLE 6-12.
I/O Board PCI Riser PCI riser
JTAG Joint Test Access Group – An IEEE subcommittee
standard (1149.1) for scanning system components
N/A
MAC Media Access Controller – Hardware address of a
device connected to a network
Centerplane
MII Media Independent Interface – Part of Ethernet
controller
Centerplane
Motherboard Centerplane Centerplane