Adaptec ULTRA160 Installation Guide - Page 4

Installation Guide Bus Segments on the Adaptec SCSI Card 29160 The Adaptec SCSI Card 29160 features Adaptec SpeedFlex™ technology. SpeedFlex technology ensures that you get the best performance from your LVD SCSI devices by electronically isolating the primary LVD/SE segment from the secondary SE segment on the SCSI bus. This allows the Adaptec SCSI Card 29160 to support LVD SCSI devices at speeds up to 160 MBytes/sec on the primary LVD/SE segment while at the same time supporting Ultra (legacy) devices at speeds up to 40 MBytes/sec on the secondary SE segment. The following figure shows the two SCSI segments. Primary LVD/SE Segment Secondary SE Segment AIC-3860 AIC-7892 NOTE If you attach Wide Ultra or Ultra SCSI devices to the two connectors on the Primary LVD/SE segment, the data transfer rate for all attached LVD SCSI devices will drop to Ultra SCSI performance levels. However, if you attach only LVD SCSI devices to the two connectors on the Primary LVD/SE segment, data will be transferred at the maximum possible rate (80 MBytes/sec for Ultra2 devices and 160 MBytes/sec for Ultra160 devices). 4