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34 Glossary
Glossary
SCSI ID - A way to uniquely identify each SCSI device on the SCSI bus. Each SCSI bus has
eight available SCSI IDs numbered 0 through 7 (or 0 through 15 for Wide SCSI). The host
adapter usually gets ID 7 giving it priority to control the bus.
SDMS - SCSI Device Management System. An ASUS software product that manages SCSI
system I/O.
STA - SCSI Trade Association. A group of companies that cooperate to promote SCSI parallel
interface technology as a viable mainstream I/O interconnect for commercial computing.
Single-Ended SCSI - A hardware specification for connecting SCSI devices. It references
each SCSI signal to a common ground. This is the most common method (as opposed to
differential SCSI which uses a separate ground for each signal).
Synchronous Data Transfer - One of the ways data is transferred over the SCSI bus. Trans-
fers are clocked with fixed-frequency pulses. This is faster than asynchronous data transfer.
Synchronous data transfers are negotiated between the SCSI host adapter and each SCSI
device.
System BIOS - Controls the low level POST (Power On Self Test), and basic operation of the
CPU and computer system.
Termination - The electrical connection required at each end of the SCSI bus, composed of a
set of resisters. It improves the integrity of bus signals..
Ultra SCSI - A standard for SCSI data transfers. It allows a transfer rate of up to 20 Mbytes/
s over an 8-bit SCSI bus and up to 40 Mbytes/s over a 16-bit SCSI bus. STA (SCSI Trade
Association) supports using the term “Ultra SCSI” over the term “Fast-20”.
Ultra2 SCSI - A standard for SCSI data transfers. It allows a transfer rate of up to 40 Mbytes/
s over an 8-bit SCSI bus, and up to 80 Mbytes/s over a 16-bit SCSI bus. STA (SCSI Trade
Association) supports using the term “Ultra2 SCSI” over the older term “Fast-40”.
VCCI - Voluntary Control Council for Interference.
VHDCI - Very High Density Cable Interconnect. A trapezoidal shielded connector that has a
0.8 mm pitch.
Wide SCSI - A SCSI-2 feature allowing 16 or 32-bit transfers on the SCSI bus. This
dramatically increases the transfer rate over the standard 8-bit SCSI bus.
Wide Ultra SCSI - The STA term for SCSI bus width 16 bits, SCSI bus speed maximum data
rate 40 Mbytes/s.
Wide Ultra2 SCSI - The STA term for SCSI bus width 16 bits, SCSI bus speed maximum
data rate 80 Mbytes/s.
Word A two byte (or 16-bit) unit of information.