User`s guide

Appendix B: SCSI Cables and Terminators 39
appendix b
SCSI Cables and Terminators
SCSI Cables
Use only the highest quality SCSI cables available when connecting a DigiDrive to your Digidesign
system. Digidesign recommends the use of SCSI cables supplied by Avid Technology. These cables are
specifically designed for systems that run real-time applications, and their lengths and electrical prop-
erties are designed to ensure data integrity on the SCSI bus. Descriptions and illustrations are pro-
vided in Table 7, which also shows a list of Avid-supplied cables that are available for connecting both
wide and narrow drives to your Digidesign system, and where to use each cable.
Table 7. SCSI Cables
Cable Type Length Purpose
Macintosh system
built-in SCSI to first
narrow drive
25-pin to 50-pin 30 inches To connect the first narrow drive to the Macin-
tosh external SCSI bus.
SCSI accelerator
board to first drive
68-pin to 50-pin 30 inches To connect the first narrow drive to the Digide-
sign SCSI bus. Use only on SCSI buses that con-
tain no wide drives.
68-pin to 68-pin 30 inches To connect the first wide drive to the SCSI bus
or a single-channel SCSI accelerator board.
60-pin to 68-pin 30 inches To connect the first wide drive to a dual-channel
SCSI bus.
SCSI cabling
between drives
50-pin to 50-pin 15 inches To connect vertically stacked narrow drives.
50-pin to 50-pin 30 inches To connect side-by-side narrow drives.
68-pin to 68-pin 15 inches To connect vertically stacked wide drives.
68-pin to 68-pin 30 inches To connect side-by-side wide drives.