HP I Dual Channel Ultra160 SCSI Host Adapter A6829A manual 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.”

Glossary

Wide Ultra2 SCSI

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.

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