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The total length of the SCSI cabling is the sum of the following:
u
SCSI cable inside each device—average 8 inches (20 cm)
u
SCSI cable between the system and the first device
u
SCSI cable between each device
SCSI Cable Quality Guidelines
To ensure data integrity and optimum performance, do the following:
u
Use only Intergraph SCSI cables. Cables from other vendors may not provide adequate
shielding.
u
Use the shortest cables possible to connect SCSI devices to the system and to each other.
NOTE Make sure the last device on a chain of external SCSI devices has an active SCSI terminator
connected to the open SCSI port. All other external SCSI devices must have SCSI
termination disabled or removed.
SCSI ID Guidelines
By default, specific devices use the following SCSI IDs:
u
SCSI adapter (optional) uses ID 7
u
Read/write CD-ROM (optional) drive uses ID 4
u
Iomega Jaz drive (optional) uses ID 6
NOTE To easily determine the ID of each SCSI device on the system, restart the system. When the
BIOS screen displays, look for the list of SCSI devices and write down the ID for each device.
Some SCSI devices have push switches to set the ID, while others have DIP switches or
jumpers. See the vendor documentation for details on setting the ID.
SCSI Termination Guidelines for External Devices
Follow the guidelines below for terminating SCSI devices:
u
Enable termination on the last external drive on the SCSI cable chain.
u
Disable termination on all other external drives on the SCSI cable chain.
u
Use only an active terminator on externally-terminated devices.
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