Choosing Scsi Cables; Connecting Internal Scsi Devices - Adaptec AHA-3980 User Manual

Choosing SCSI Cables

Always use high-quality SCSI cables to connect the AHA-398x to
devices on the SCSI bus. Poor-quality cables can cause data corrup-
tion, parity errors, and other problems. High-quality cabling is espe-
cially critical if you use Fast SCSI data transfer rates.
The cables used for external SCSI devices vary widely in quality and
electrical characteristics. Use external SCSI cables that
Meet SCSI-2 standards (your cable vendor can tell you this)
Have a single-ended impedance range of 80-110 ohms
Adaptec sells high-quality internal and external SCSI-2 cables, which
you can purchase by calling Adaptec at the number listed on page ii.

Connecting Internal SCSI Devices

Use the SCSI ribbon cables included with the AHA-398x kit to con-
nect internal devices to the adapter. Each AHA-398x ribbon cable
has several connectors, including connectors at each end of the
cable. The connector at one end is attached to a passthrough termi-
nator (for information on termination, see Terminating the SCSI Bus
on page 5-12). You can attach this connector to a SCSI device, even
with the terminator in place.
Note:
If you need more cables, you can purchase them from
Adaptec by calling the number listed on page ii.
Follow these steps to connect internal SCSI devices to the internal
connectors on the AHA-398x:
1
If you need to physically install the SCSI device inside your
computer before attaching the cables, follow the installation
instructions in the device documentation.
AHA-3980/3980W/3985/3985W User's Guide
Stock Number: 510810-00, Rev. D
Print Spec Number: 493479-00
Current Date: 3/1/99
Installing the AHA-398x and the SCSI Drives
Page: 5-7
ECN Date: 3/19/96
5-7