User Guide

4 ASUS PCI-SC875 User’s Manual
III. INSTALLATION
5. Position the host adapter directly over the PCI slot and insert the end of the
board in the card guide. Carefully press the bus connector on the bottom of the
host adapter down into the slot. Be sure the metal contacts on the bottom of the
host adapter are securely seated in the slot.
6. Attach the host adapter bracket to the computer chassis with the screw from the
slot cover that you removed in step 4.
NOTE: Do not replace the computer cover or reconnect the power yet!
Connecting SCSI Cables and Devices
Choosing SCSI Cables
Always use high-quality SCSI cables to connect the host adapter to devices on the
SCSI bus. Poor-quality cables can cause data corruption, parity errors, and other
problems. High-quality cabling is especially critical if you use UltraSCSI or Fast
SCSI data transfer rates.
The round cables used for external SCSI devices vary widely in quality and electri-
cal characteristics. Be sure external SCSI cables meet SCSI-2 standards (ask your
cable vendor). For UltraSCSI applications, SCSI cables must meet Fast-20 SCSI
standards. Here are some guidelines for external SCSI cables:
• SCSI-2: Use cables with a single-ended impedance range of 90 to 132ohms.
• UltraSCSI: Use cables with a single-ended impedance range of 90±10ohms. For
the req and ack signals the impedance should be 90±6ohms.
III. INSTALLATION
(SCSI Cables)