HP Visualize c3000 hp Visualize b1000 and c3000 workstations service handbook - Page 203

SCSI Bus Differences

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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 Addresses1 Maximum Cable Length Device Physical Location2 Ultra Narrow Up to 20 8 bits Single-Ended Mbytes/sec 0 through 6 3.0 meters (9.84 feet) External Ultra2 Wide Low-Voltage Differential Up to 80 16 bits Mbytes/sec 0 through 6; 12 meters 8 through 15 (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. Appendix B 203

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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 V
ISUALIZE
B1000/C3000 workstations.