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Appendix B
143
SCSI Connections
SCSI Bus Differences
SCSI Bus Differences
A SCSI (Small Computer Systems Interface) bus is an IEEE standard bus for connecting a
workstation to internal and external SCSI devices running at different speeds. There may
be 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 4 mm DDS-format tape drives, CD ROM drives, and hard disk drives.
There are two types of SCSI buses available with the J6700 workstation: a Narrow
Single-Ended SCSI-2 bus (SE), and an Ultra2 Wide Low Voltage Differential SCSI bus
(LVD). The following table shows the specification differences between these two SCSI
buses.
CAUTION
Do not connect SE SCSI devices to the LVD SCSI connector, or vice versa,
because damage may occur. Currently Hewlett-Packard does not support
mixing SE and LVD devices on the same SCSI bus.
Table B-1. SCSI Bus Differences
SCSI Type
Transfer Rate
Data Bus
Width
Maximum
Addresses
1
1.
Address 7 is reserved for host controller use on all buses.
Maximum
Cable
Length
Device
Physical
Location
2
2.
This information is specific to the HP VISUALIZE J6700 workstations.
SE/LVD
Up to 20 MB/sec
8 bits
0 through 6
3.0 meters
(9.84 feet)
External
LVD
Up to 80 MB/sec
16 bits
0 through 6;
8 through 15
12 meters
(39.37 feet)
Internal
Summary of Contents for j6700
Page 1: ...Service Handbook HP VISUALIZE J6700 Workstations Manufacturing Part Number n a Edition E0501 ...
Page 8: ...8 Contents ...
Page 30: ...30 Chapter1 Product Information Monitors ...
Page 76: ...76 Chapter3 Troubleshooting Using the System Board LEDs for Troubleshooting ...
Page 100: ...100 Chapter4 Field Replaceable Units FRUs FRU Removal and Replacement ...
Page 134: ...134 Chapter5 Boot Console Handler Initial System Loader ISL Environment ...
Page 150: ...150 Appendix B SCSI Connections How To Connect An SE SCSI Device ...