Fast, Wide Scsi-3 Bus Configuration Constraints; Determining Scsi Bus Length; Single-Ended Scsi-2 Bus Length - HP J Class Owner's Manual

Table C–4. Fast, Wide SCSI-3 Bus Configuration Constraints
External Fast, Wide SCSI-3 Devices
SCSI-3 Drive (fast, wide disk drives only)
SCSI-3 Disk Arrays (addressed as single drive)
Determining
SCSI Bus
Length

Fast, Wide SCSI-3 Bus Configuration Constraints

Fast, wide SCSI-3 does not work with the single-ended standard
SCSI-2. Table C–4 shows the configuration constraints for each fast,
wide SCSI-3 device type.
CAUTION: Do not mix single-ended and fast, wide SCSI
peripherals together on the same bus.
This section helps you to determine the total length of the single-en-
ded standard SCSI-2 bus and the fast, wide SCSI-3 bus.

Single-Ended SCSI-2 Bus Length

Follow these instructions to calculate your total single-ended standard
SCSI-2 bus length (including the system unit, external SCSI-2 de-
vices, and SCSI-2 interconnect cables) using Table C–5:
1.
Find all of your external SCSI-2 devices in the first column. In
the third column, write the SCSI-2 bus lengths (from the second
column) that correspond to your devices.
NOTICE: In the third column, the length for the System
Unit is already listed. This number must always
be used for the system unit.
Maximum Number of Each
Type of Device Allowed
15
7
C-9