Installing Scsi Devices - Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps User Manual

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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-2940Ultra, and
up to 15 devices (seven 8-bit internal and eight Wide
(16-bit) internal or external SCSI devices, or 15 Wide
internal and external SCSI devices) to the
AHA-2940Ultra Wide.
Note:
You may only use two of the
three connectors at any one time on the
AHA-2940Ultra Wide host adapter.
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.
AHA-2940 Ultra
SCSI Device Type
8-bit Internal SCSI 50-pin internal
SCSI cable
8-bit External SCSI 50-pin high-density
external SCSI cable
16-bit Internal
Wide SCSI
16-bit External
Wide SCSI
If you purchased your AHA-2940Ultra/2940Ultra
Wide in an Adaptec kit, the kit includes an internal
SCSI cable that allows you to connect up to two
internal SCSI devices (the AHA-2940Ultra kit
includes a 50-pin internal SCSI cable, and the
AHA-2940Ultra Wide kit includes both a 50-pin and
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,
you can order them directly from Adaptec.
When Fast SCSI devices are connected to the host
adapter, the total length of all cables (internal and
AHA-2940 Ultra Wide
50-pin internal
SCSI cable
—
— 68-pin internal
SCSI cable
— 68-pin external
SCSI cable
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