
Appendix A Specifications
SCSI Interface
48
LTO Ultrium 8-Slot Autoloader User’s Guide
SCSI Cable
Requirements
1
The manufacturer recommends using 68-pin SCSI cables that conform to
SCSI-3 specifications.
SCSI Cable Length
1
The maximum allowable cable length for a low-voltage differential SCSI
bus, including all internal and external cables, is specified as follows:
• If you have more than two devices on the LVD bus, the maximum
allowable length is 39 feet (12 meters).
• If you are making a point-to-point connection (target and initiator
only), the maximum length is 82 feet (25 meters).
• To determine the cable length of the bus, measure the lengths of all
external SCSI cables. Add those lengths together. To that sum, add
26.8 inches (68 centimeters) for the internal SCSI cable length.
Caution:
All wide SCSI configurations (single-ended, LVD, and
HVD) use the same 68-pin connector. Attaching the
autoloader directly to an HVD SCSI will make the entire
bus non-functional and may permanently damage the
drive or other SCSI devices on the bus.
Note:
To comply with the safety and regulatory agency standards for
the autoloader, all SCSI cables you use with the autoloader
must be properly shielded.
Note:
The autoloader and the tape drive are independent SCSI
devices on the same SCSI bus. As a result, when they are
connected to the initiator, there are a minimum of three
devices attached to the SCSI bus. Therefore, the maximum
allowable cable length is 39 feet (12 meters).
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