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A.2
SCSI Bus Length
A bus is a signal route to which several parts of a computer system can be connected
so that signals can pass between them. The total length of a SCSI bus includes:
The length of the external SCSI cable plus
The length of the internal SCSI buses for the device and the system
Your desktop system performance is reliable with a maximum SCSI bus length of 20
feet (6 meters), shown in Figure B-1. The internal signal path of your system unit
and the external SCSI cables must not exceed this maximum length. If this length is
exceeded, the system will not run in a reliable manner.
FIGURE A-1
A.2.1
Computing SCSI Bus Lengths
When connecting the tape library to your system, find the total SCSI bus length for
your configuration. To do this, add the length of the internal bus lengths of each
device of the system to the length of the external SCSI cable, which can measure
either 0.8, 2, or 4 meters in length. The total length must be less than 20 feet (6
meters).
For example, if you were to connect a tape library to a SPARCstation 10 system, this
configuration would have a total SCSI bus length of 3.4 meters as follows:
tape library (internal signal path) 0.50 meters
SPARCstation 10 System (internal signal path) 0.90 meters
SCSI Cable between them 2.0 meters
Since the total SCSI bus length is well below the maximum of 6 meters, this
configuration is acceptable.
Host
SCSI peripheral
Maximum SCSI Bus Length
SCSI peripheral
maximum 6 meters
Appendix A
SCSI peripheral
SCSI Information
A-3
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