User`s guide

DigiDrive Guide 6
Cables
Use only high-quality LVD SCSI cables when
you are attaching a DigiDrive to the SCSI bus on
your Digidesign system.
The DigiDrive includes a 30" Avid SCSI LVD ca-
ble that meets all requirements for optimal per-
formance. This cable is backward-compatible
and also operates in single-ended fast, wide
mode.
SCSI IDs
Your Digidesign system identifies the DigiDrives
connected on the SCSI bus by the drive’s as-
signed SCSI ID. When you are assigning SCSI
IDs to the drives, remember the following:
◆
Each SCSI ID on a SCSI bus must be unique.
◆
Each device on each SCSI bus, including the
system SCSI accelerator board, has its own SCSI
ID.
◆ SCSI ID 7 is reserved for each SCSI accelerator
board in your system. You must never assign
SCSI ID 7 to a DigiDrive.
◆
Narrow drives can only use SCSI IDs 0
through 6.
◆
Wide drives, such as the DigiDrive, can use
SCSI IDs 0 through 6 and 8 through 15.
SCSI ID Conflicts
When you add a new DigiDrive to your system,
always check which SCSI IDs are currently in
use. Assigning duplicate SCSI IDs causes prob-
lems such as system errors, the drive not appear-
ing on the desktop, multiple copies of the same
drive appearing on the desktop, possible data
corruption, or system startup failures.
Termination
You need to connect a SCSI LVD terminator to
the last drive on each SCSI bus. Make sure to use
only the highest quality SCSI terminators to en-
sure data integrity.
The DigiDrive comes with Avid's patented 68-
pin multi-mode (LVD or Single-Ended) termina-
tor for optimal data integrity across the SCSI
chain. The Avid LVD terminator detects the
SCSI bus mode. The LED on the end of the ter-
minator is green when the SCSI bus is in LVD
mode, and amber when the SCSI bus is in single-
ended fast, wide mode.
You need to connect an ultra, wide-to-narrow
SCSI adapter to change from 68-pin cabling to
50-pin cabling. The adapter terminates the un-
used lines to help prevent any SCSI bus prob-
lems.
Mixing an LVD drive with a single-ended wide
and/or narrow drive on an LVD bus causes the
bus to default to single-ended mode. When you
mix drive types, cable length restrictions for sin-
gle-ended SCSI chains apply.
For more information on SCSI cables,
see
Appendix B .
For more information on SCSI terminators,
see Appendix B.