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Appendix A Installation Requirements
This appendix provides specific installation requirements
for the tape drive. It also provides guidelines for the
following tasks:
■
Selecting the correct SCSI cable and connector (pages
37 and 38)
■
Attaching the tape drive to a frame (page 38)
■
Providing chassis grounding (page 40)
■
Connecting the tape drive to the power supply (page
40)
If you have already installed the tape drive in a PC, you
can skip this appendix.
SCSI Cable Requirements
The SCSI cable for connecting the tape drive to the host is
not provided with the tape drive. You must provide a
cable that complies with the appropriate safety and
regulatory agency requirements. To comply with FCC,
Canadian DOC, and VDE limits, the tape drive requires
shielded cables when the cables are external to the
mounting enclosure.
General Requirements
Use a 50-conductor flat cable or 25-signal twisted pair
cable. A minimum conductor size of 28 AWG is
recommended to minimize noise effects and ensure
proper distribution of terminator power.
Ideally,tomatchthecableterminators,thecableshould
have a characteristic impedance of 122 ohms (differential)
or 132 ohms (single-ended). However, since cables with
this high of a characteristic impedance are not generally
available, somewhat lower impedances are acceptable. A
characteristic impedance of 100 ohms ± 10% is
recommended for unshielded flat or twisted-pair ribbon
cable. A characteristic impedance greater than 90 ohms is
recommended for shielded cables.
December 1993 EXB-8500/EXB-8500c 39