Dell Precision 620 - Manual (Page 43)

See the documentation provided with any optional SCSI device you purchase for information on disabling termination on the device.
SCSI Cables
The 68-pin (internal) SCSI cable in your system connects SCSI devices to the 7899 Ultra160/M LVD controller.
l The connector at the end of the cable attaches to the Ultra2/Wide LVD primary SCSI controller connector labeled "SCSI_ULTRA2" on the
system board.
l The other connectors on the cable are used for attaching up to two SCSI hard-disk drives in the internal drive bays (see Figure 14).
The 50-pin (internal) Narrow SCSI cable connects SCSI devices to the 7899 Ultra160/M controller.
l The narrow connector at the end of the cable attaches to the secondary SCSI controller connector labeled "SCSI_NARROW" on the system
board.
l
The other connectors on the cable are used for attaching SCSI devices installed in the externally accessible drive bays (see Figure 14).
An optional shielded external cable with a 68-pin connector is used for attaching an external SCSI device to the 7899 Ultra160/M external SCSI
connector on the system's back panel.
Refer to the documentation that came with the external SCSI device for information on how to connect the device, set its SCSI ID, and disable
termination.
Figure 14. Internal SCSI Cable
SCSI Device Installation
To install a SCSI device, perform the following steps:
1. Determine which connector on the internal SCSI cable you will attach to each SCSI device (see " Installing SCSI Devices ").
2. Unpack the SCSI device and prepare it for installation.
3. Configure the device for a SCSI ID number and disable termination, if necessary. For instructions, see the documentation that came with the
SCSI device as well as " Installing SCSI Devices ."
4. Install the SCSI device as appropriate.
l To install a SCSI hard-disk drive, complete steps 3 through 10 of " Installing an EIDE Hard-Disk Drive ." Then continue with step
5 of this procedure.
l 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
Bay ." Then continue with step 5 of this procedure.
l
To install an external SCSI device, continue with step 5 of this procedure.
l
To install a SCSI host adapter card, configure the card and install it in an empty expansion slot (see " Installing an Expansion
Card ".) If you attach any SCSI hard-disk drives to the host adapter card, connect the hard-disk drive access cable to the SCSI
host adapter card and to the AUX LED connector on the system board (see Figure 1 in "Installing System Board Options"). Then
continue with step 5 of this procedure.
5. Attach the SCSI cable to each SCSI device.
1 50-pin SCSI cable (to device[s] in externally accessible drive bay)
2 68-pin SCSI cable (to hard-disk drive)
NOTICE: Ground yourself by touching an unpainted metal surface on the back of the computer.
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.