HP A6829A PCI Dual Channel Ultra160 SCSI Host Bus Adapter Service and User Guide (May 2003)

Glossary
Wide Ultra2 SCSI
Glossary 121
small computer system interface
(SCSI) A specification for a
high-performance peripheral bus and
command set. The original standard is now
referred to as SCSI-1.
synchronous data transfer One of the
ways data is transferred over the SCSI bus.
Transfers are clocked with fixed-frequency
pulses.
system firmware Controls the low level
POST (Power On Self Test) and basic
operation of the CPU and computer system.
T
termination The electrical connection
required at each end of the SCSI bus,
composed of a set of resistors.
U
Ultra SCSI A standard for SCSI data
transfers. It allows a transfer rate of up to 20
MBytes/sec over an 8-bit SCSI bus, and up to
40 MBytes/sec over a 16-bit SCSI bus. The
STA (SCSI Trade Association) supports
using the term “Ultra SCSI” over the older
term “Fast-20.”
Ultra160 SCSI (Also called Ultra3 SCSI) A
standard for SCSI data transfers. It allows a
data transfer rate of up to 160
MBytes/second over a 16-bit SCSI bus. The
bus width is always 16 bits.
Ultra2 SCSI A standard for SCSI data
transfers. It allows a transfer rate of up to 40
MBytes/sec over an 8-bit SCSI bus, and up to
80 MBytes/sec over a 16-bit SCSI bus. The
STA (SCSI Trade Association) supports
using the term “Ultra2 SCSI” over the older
term “Fast-40.”
V
VCCI Voluntary Control Council for
Interference.
VHDCI Very High Density Cable
Interconnect.
W
Wide SCSI A SCSI-2 feature allowing 16-bit
transfers on the SCSI bus. This doubles the
transfer rate over the standard 8-bit SCSI
bus.
Wide Ultra SCSI The STA (SCSI Trade
Association) term for SCSI bus width 16 bits,
SCSI bus speed maximum data rate 40
MBytes/sec.
Wide Ultra2 SCSI The STA (SCSI Trade
Association) term for SCSI bus width 16 bits,
SCSI bus speed maximum data rate 80
MBytes/sec.