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AHA-2940/2940W Installation Guide
Part Number: 510881-00, Rev. A
Print Spec Number: 493890-00
Current Date: 7/5/95
ECN Date: 7/11/95
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Installing SCSI Devices
You can connect up to a total of seven internal and
external 8-bit SCSI devices to the AHA-2940, and up
to 15 devices (seven 8-bit internal and eight Wide (16-
bit) internal or external SCSI devices, or 15 Wide inter-
nal and external SCSI devices) to the AHA-2940W.
Choosing SCSI Cables
The cables required to connect SCSI devices are
determined by the type of devices you are installing,
as described in the following table.
If you purchased your AHA-2940/2940W in an
Adaptec kit, the kit includes an internal SCSI cable
that allows you to connect up to two internal SCSI
devices (the AHA-2940 kit includes a 50-pin internal
SCSI cable, and the AHA-2940W kit includes a
68-pin internal SCSI cable). If you are connecting
more than two internal SCSI devices, you must
obtain an internal SCSI cable with enough connec-
tors to accommodate all of your devices.
Adaptec sells high-quality internal and external SCSI
cables. If your reseller does not stock these cables,
call Adaptec directly at the number for ordering
Adaptec software and cables listed on page 12.
When Fast SCSI devices are connected to the host
adapter, the total length of all cables (internal and
external) must not exceed 3 meters (9.8 ft.) to ensure
reliable operation. If no Fast SCSI devices are con-
nected, the total length of all cables must not exceed
6 meters (19.7 ft). See your device’s documentation
to determine if it is a Fast SCSI device.
SCSI Device Type
AHA-2940
AHA-2940W
8-bit Internal SCSI
50-pin internal
SCSI cable
50-pin internal
SCSI cable
8-bit External SCSI
50-pin high-density
external SCSI cable
—
16-bit Internal Wide SCSI
—
68-pin internal
SCSI cable
16-bit External Wide SCSI
—
68-pin external
SCSI cable
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