HP Visualize J5000 hp Visualize J5000, J7000 workstations service handbook (a4 - Page 198

SCSI Bus Length Constraints, NSE SCSI Bus Length

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SCSI Connections SCSI Bus Length Constraints SCSI Bus Length Constraints This section discusses SCSI bus lengths constraints for the NSE and LVD SCSI buses. NSE SCSI Bus Length The maximum cable length for an NSE SCSI bus is 3 meters. The J5000 and J7000 workstation use a negligible amount of this maximum cable length. NOTE When calculating the total NSE 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 you need to consider when dealing with an NSE SCSI bus on a 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). Please check with the vendor of the SCSI device if you are not sure of the device's maximum capacitance. The total cable length specifications are as follows: • 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 The computer is counted as one of the devices, and the internal length of its cabling is .15 meters. This length needs to be considered in determining the total cable length. LVD SCSI Bus Length The maximum cable length for an LVD SCSI bus is 12 meters. The J5000 and J7000 workstation use 1 meter of this maximum cable length internally. This means that up to 11 meters of cable can be used for connecting external LVD SCSI devices to this workstation. NOTE When calculating the total LVD 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. 194 Appendix C

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194
Appendix C
SCSI Connections
SCSI Bus Length Constraints
SCSI Bus Length Constraints
This section discusses SCSI bus lengths constraints for the NSE and LVD SCSI buses.
NSE SCSI Bus Length
The maximum cable length for an NSE SCSI bus is 3 meters. The J5000 and J7000
workstation use a negligible amount of this maximum cable length.
NOTE
When calculating the total NSE 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 you need to consider when dealing with an
NSE SCSI bus on a 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). Please check with the vendor of the SCSI
device if you are not sure of the device’s maximum capacitance.
The total cable length specifications are as follows:
•
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
The computer is counted as one of the devices, and the internal length of its
cabling is .15 meters. This length needs to be considered in determining the
total cable length.
LVD SCSI Bus Length
The maximum cable length for an LVD SCSI bus is 12 meters. The J5000 and J7000
workstation use 1 meter of this maximum cable length internally. This means that up to 11
meters of cable can be used for connecting external LVD SCSI devices to this workstation.
NOTE
When calculating the total LVD 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.