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Appendix A
150
Exabyte 440 and Exabyte 480
Cable length for single-ended configurations
If you are using Exabyte Mammoth tape drives and your host can
transfer data at more than 5.0 MB per second, the total length of
all internal and external cables should not exceed 3.0 meters
(9.8 feet).
If your host limits data transfers to 5.0 MB per second or less, or if
you are using Eliant 820 tape drives, the total length of all internal
and external cables should not exceed 6.0 meters (19.7 feet).
Cable length for LVD/ HVD configurations
The total length of all internal and external cables on the SCSI bus
should not exceed 12.0 meters (39 feet). In a point-to-point
configuration, the maximum allowable cable length is 25.0 meters
(82 feet).
Determining the cable length for each bus
1. For each bus, add the lengths of all external SCSI cables.
2. To that total, add the SCSI cable lengths used by the library for
each bus:
For each tape drive, add 28 cm (11 in.) to allow for the cable
used by the tape drive inside the library.
For each jumper you plan to install on the library to connect
sequential devices to the same bus, add 5 cm (2 in.).
If you have a wide SCSI library, add 13 cm (5 in.) for the
internal cable used by the library itself, and 5 cm (2 in.) for
the SCSI jumper cable.
In the narrow library, the library and the topmost tape drive
use the same SCSI cable. There is no additional cable for the
library itself.