Avago Technologies LSI53C320 - Manual (Page 14)

1-4 Introduction
Version 2.2 Copyright © 2003 by LSI Logic Corporation. All rights reserved.
Figure 1.3 shows cascading of the LSI53C320 to achieve four distinct
SCSI segments. Segments A and D are point-to-point segments.
Segments B and C are load segments and have at least 8-inch spacing
between every node.
Table 1.3 shows the distance requirements for each
SCSI bus segment.
Figure 1.3 LSI53C320 SCSI Bus Device
Table 1.2 SCSI Bus Length Limits in a Clustering Configuration
Segment Mode Length Limit
A LVD (Ultra320 SCSI) Up to 12 meters
SE (Ultra SCSI) Up to 3 meters
1
1. The cable length can be more than 1.5 meters, since this is a point-to-point
connection.
B LVD (Ultra320 SCSI) Up to 12 meters
SE (Ultra SCSI) Up to 1.5 meters
C LVD (Ultra320 SCSI) Up to 12 meters
SE (Ultra SCSI) Up to 1.5 meters
A + B + C + D Ultra320 SCSI (only) Less than 29 meters
2
2. Refer to Section 2.2.3, “Maximum Cable Lengths,” for more information on
cable length limits in an Ultra320 SCSI environment.
Segment A Segment B Segment C
Primary Secondary
Shared Disk
SCSI Bus
Expander SCSI Bus
Expander
Server Server
SCSI Bus
Expander
Segment D
Subsystem
Shared Disk
Subsystem