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Chapter 2. Preparing for Installation
This chapter helps you prepare to install the PCI-X Dual Channel Ultra320 SCSI Adapter. Preparing to
install the adapter involves the following tasks:
v Verifying your hardware requirements
v Gathering tools and documentation
Verifying Your Hardware Requirements
To connect the PCI-X Dual Channel Ultra320 SCSI Adapter to SCSI devices, you may need the following
hardware:
v External cables
v Internal cables
v A single-ended SCSI terminator
v A 68-position high-density plastic D-shell VHDCI to 68-position high-density plastic D-shell SCSI
standard 16-bit interposer cable
v A 68-position to 50-position interposer connector
Determining Cable Needs
Use this section to determine your cable needs.
External Cable Connectors
External SCSI devices are manufactured with a variety of connectors. Ensure that you have cables with
the correct connectors for each external 8-bit or 16-bit device in your planned SCSI chain.
LVD subsystems come with a cable having a VHDCI connector to attach to the adapter's VHDCI
connector.
For either external 8-bit or 16-bit single-ended devices, the cable end going to the adapter is a 68-position
high-density plastic D-shell connector. This connector joins to a VHDCI to P-shell converter cable, which
plugs into the adapter.
External Cable Lengths
SCSI specifications limit the total cable length attached as a function of SCSI bus speed as follows:
v To attach an LVD subsystem running at Ultra2 speed (80 MB/s), Ultra3 speed (160 MB/s), or Ultra320
speed (320 MB/s), the maximum cable length is 20 meters (approximately 60 feet).
v To attach an Ultra, 20 MHz synchronous device (such as a 16-bit SCSI disk drive that can transfer up to
40 MB/s of data), the maximum cable length is 3 meters (approximately 10 feet). Up to two devices can
be attached.
v To attach a fast, 10 MHz synchronous device (such as an 8-bit SCSI disk that can transfer up to 10
MB/s of data or a 16-bit SCSI disk that can transfer up to 20 MB/s of data), the maximum cable length
is 3 meters (approximately 10 feet). Up to four devices can be attached.
For information about connecting SCSI devices to your adapter, see Appendix C, "Connecting SCSI
Devices to the Adapter," on page 33.
Internal Cable Connectors
Depending on your machine type, up to six (6) SCSI devices can be plugged into a backplane. A 16-bit
cable attaches the adapter's internal connector Channel 0 (J2) or Channel 1 (J3) to the backplane. For an
illustration of the SCSI connectors, see "PCI-X Dual Channel Ultra320 SCSI Adapter SCSI Connectors" on
page 2.
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