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Appendix B 203
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 may be one device connected to the external SCSI port or more than one
device may be daisy chained to a single external SCSI port. Examples of SCSI devices are
4-mm 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 LVD devices on any one bus type.
Table B-1. SCSI Bus Differences
Type Transfer
Rate
Data Bus
Width
Available
SCSI
Addresses
1
Maximum
Cable Length
Device
Physical
Location
2
Ultra Narrow
Single-Ended
Up to 20
Mbytes/sec
8 bits 0 through 6 3.0 meters
(9.84 feet)
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 workstations.