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208 AppendixB
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 a Ultra Narrow Single-Ended SCSI bus is 3 meters. The
HP V
ISUALIZE B1000/C3000 system uses a negligible amount 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 the workstation. 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). Check with the vendor of the SCSI device
for the maximum capacitance specification.
The total cable length specifications are described below:
• 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.
NOTE
Remember that the workstation is counted as one of the total device, and the
internal length of its cabling is 0.15 meters. This length needs to be
considered in your total cable length determination.
Ultra2 Wide Low-Voltage Differential SCSI Bus Length
The maximum cable length for a Ultra Wide Low-Voltage Differential SCSI bus is 12
meters. The HP V
ISUALIZE B1000/C3000 system uses 1 meter of this maximum cable
length internally. This means that up to 11 meters of cable can be used for connecting
external Ultra2 Wide Low-Voltage Differential SCSI devices to this workstation.