Adaptec 19160, Installation Manual

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Installation Guide
Bus Segments on the Adaptec SCSI Card 19160
The Adaptec SCSI Card 19160 features Adaptec SpeedFlex™
technology. SpeedFlex technology ensures that you get the best
performance from your LVD SCSI devices by electronically
isolating the LVD/SE segment from the SE segment on the SCSI
bus. This allows the Adaptec SCSI Card 19160 to support LVD
SCSI devices at speeds up to 160 MBytes/sec on the LVD/SE seg-
ment while at the same time supporting SE Fast/Ultra SCSI
devices at speeds up to 20 MBytes/sec on the SE segment. The
following figure shows the two SCSI segments.
If you attach Wide Ultra or Ultra SCSI devices to the
connector on the LVD/SE segment, the data transfer rate for
all attached LVD SCSI devices will drop to Ultra SCSI perfor-
mance levels. However, if you attach only LVD SCSI devices to
the connector on the LVD/SE segment, data will be trans-
ferred at the maximum possible rate (80 MBytes/sec for
Ultra2 devices and 160 MBytes/sec for Ultra160 devices).
AIC-3860
AIC-7892
SE Segment LVD/SE Segment
N
OTE
ASC-19160_IG.book Page 2 Wednesday, December 1, 1999 12:47 PM