HP Visualize J5000 hp Visualize J5000, J7000 workstations owner's guide (a4978 - Page 125

SCSI Connections SCSI Bus Differences SCSI Bus Differences A Small Computer Systems Interface (SCSI) bus is an IEEE standard bus for connecting your workstation to internal and external devices (SCSI devices) running at different speeds. There maybe one device connected to the external SCSI port or several SCSI devices may be daisy chained together and connected to the external SCSI port. Examples of these SCSI devices are 4mm DDS-format tape drives and hard disk drives. There are two types of SCSI buses available with this workstation-an Ultra Narrow Single-Ended SCSI bus (NSE SCSI), and an Ultra2 Wide Low-Voltage Differential SCSI bus (LVD SCSI). The following table shows the specification differences between these SCSI buses. CAUTION Currently Hewlett-Packard does not support mixing Ultra Narrow Single-Ended and Ultra2 Wide Low-Voltage Differential devices on any one bus type. Table 7-1 SCSI Bus Differences Type Data Transfer Rate Data Bus Width Available SCSI Addresses1 Maximum Cable Length Device Physical Location2 Ultra Narrow Up to 20 Single-Ended Mbytes/sec 8 bits 0 through 6 3.0 meters (9.84 feet) Internal and external Ultra2 Wide Low-Voltage Differential Up to 80 Mbytes/sec 16 bits 0 through 6; 8 through 15 12 meters (39.37 feet) Internal and external 1. Address 7 is reserved for host controller use on all buses. 2. This information is specific to the HP Visualize B1000/C3000 and J5000/J7000 computers. Chapter 7 125