HP Visualize J5000 hp Visualize J5000, J7000 workstations owner's guide (a4978 - Page 130

NOTE 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 J5000/J7000 system uses 0.15 meters of this maximum cable length. 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. Note 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. 130 Chapter 7