Dell OptiPlex GX1p User Manual
Page 18
SCSI Cable and SCSI Termination
The type of cabling you receive with your SCSI device depends on the type of device you are installing.
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adapter. The connectors on the other end of the cable attach to the internal SCSI devices.
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If you are installing an external SCSI device, you have a shielded external cable that connects to the external SCSI connector on the SCSI
host adapter card. You have a separate power cable to connect the SCSI device to an AC power source.
Before installing SCSI devices in your computer, you may need to configure the termination on your SCSI device(s). Both types of internal SCSI
cables contain terminators on the device end of the cables, so the devices connected to these cables must have termination disabled (see Figure
14). External SCSI cables do not have terminators, so termination must be enabled on the SCSI device itself.
Figure 14. Internal SCSI Cables
If you are installing only internal SCSI devices, verify that termination is enabled on the SCSI host adapter and disabled for all other internal SCSI
devices. If you are installing both internal and external SCSI devices, verify that termination is enabled on the external SCSI device and disabled for
the SCSI host adapter and all internal SCSI devices.
General Procedure for Installing SCSI Devices
Configure and install one or more SCSI devices in your computer as follows:
1. Determine which connector on the internal SCSI cable you will attach to each SCSI device.
See "
NOTICE: When you unpack the drive, do not set it on a hard surface, which may damage the drive. Instead, set the drive on a
surface, such as a foam pad, that will sufficiently cushion it.
2. Unpack each SCSI device and prepare it for installation.
Configure the device for a SCSI ID number and, if necessary, enable or disable termination. For instructions, see the documentation that
came with the SCSI device and "
3. Remove the computer cover as instructed in "
Removing the Computer Cover
."
4. If you are installing a SCSI host adapter card, configure the adapter card.
For instructions on configuring the card, see the documentation that came with the adapter card and "
5. Install the SCSI devices as appropriate.
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To install an internal SCSI hard-disk drive, complete steps 3 through 7 of "
Installing an EIDE Hard-Disk Drive in the Hard-Disk
." Then continue with step 5 of this procedure.
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To install a SCSI tape drive, CD-ROM drive, or DAT drive, complete steps 2 through 6 of "
Installing a Drive in a 5.25-Inch Drive
." Then continue with step 5 of this procedure.
NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that devices be attached to the cable in order by ID
number.
NOTICE: Do not connect devices to all three connectors (internal narrow connector, internal wide connector, and external
connector) on a single SCSI host adapter card. Such a configuration is a violation of the SCSI specification. You can safely connect
devices to any two of these three connectors on a single SCSI host adapter card.
CAUTION: To avoid the possibility of electric shock, turn off the computer and any peripherals, disconnect them from their
electrical outlets, and then wait at least 5 seconds before you remove the computer cover. Also, before you install an
expansion card, see "
Safety First
— For You and Your Computer
."