Scsi Bus Differences - HP Visualize b1000 - Workstation Handbook

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
Ultra Narrow Up to 20
Single-Ended Mbytes/sec
Ultra2 Wide Up to 80
Low-Voltage Mbytes/sec
Differential
1. Address 7 is reserved for host controller use on all buses.
2. This information is specific to the HP V
Appendix B
Data Bus Available
Width SCSI
Addresses
8 bits 0 through 6
16 bits 0 through 6;
8 through 15
B1000/C3000 workstations.
ISUALIZE
Maximum Device
Cable Length Physical
1
Location
3.0 meters External
(9.84 feet)
12 meters Internal and
(39.37 feet) external
SCSI Connections
SCSI Bus Differences
2
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