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88 Chapter4
SCSI Connections
SCSI Bus Length Constraints
SCSI Bus Length Constraints
This section discusses SCSI bus length constraints for the Ultra Narrow
Single-Ended SCSI bus and the Ultra2 Wide Low-Voltage Differential
SCSI bus.
Ultra Narrow Single-Ended SCSI Bus Length
The maximum cable length for an Ultra Narrow Single-Ended SCSI bus
is 3 meters. The HP VISUALIZE B1000/C3000 system uses a small portion
of this maximum cable length.
NOTE When calculating the total Ultra Narrow Single-Ended SCSI
cable/bus/trace length used externally, remember to account for cables
connecting external devices together as well as the bus length internal to
those devices.
There are two total cable length specifications that apply to the Ultra
Narrow Single-Ended SCSI bus on your computer. Note that these
specifications are based on the requirement that the SCSI device being
connected to the NSE SCSI bus does not exceed the maximum
capacitance of 25 picofarads (pF). Please check with the vendor of your
SCSI device if you are not sure of your devices maximum capacitance.
Here are the total cable length specifications:
• For a total of one to four devices being connected to the NSE SCSI bus
the total length of cable used should not exceed 3.0 meters.
• For a total of five to eight devices being connected to the NSE SCSI
bus the total length of cable used should not exceed 1.5 meters.
Please remember that the computer is counted as one of the total
devices, and the internal length of its cabling is 0.15 meters. This length
needs to be considered in your total cable length determination.