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Appendix C Glossary of Terms 53
TERMINATION
A physical requirement of the SCSI bus. The first and last devices
on the SCSI bus must have terminating resistors installed, and the
devices in the middle of the bus must have terminating resistors
removed. The Single Ended electrical class depends on very tight
termination tolerances, but the passive 132 ohm termination
defined in 1986 is mismatched with the cable impedance (typically
below 100 ohms). Although not a problem at low speeds when
only a few devices are connected, reflections can cause errors
when transfer rates increase and/or more devices are added. In
SCSI-2, an active terminator has been defined which lowers
termination to 110 ohms and is a major boost to system integrity.
U
UltraSCSI
A method that enables very fast data transfer rate on the SCSI
bus. The maximum UltraSCSI data transfer rates are 20 MBytes/
second (40 MBytes/second for Wide SCSI host adapters).
V
W
Wide SCSI
Provides for performance and compatibility enhancements to
SCSI-1 by adding a 16- or 32- bit data path. Combined with Fast