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SCSI Connections
Determining SCSI Bus Length
Determining SCSI Bus Length
This section helps you to determine the total length of the narrow, single-
ended SCSI bus, the fast, wide differential SCSI bus and ultra, wide single-
ended SCSI bus.
Narrow, Single-Ended SCSI Bus Length
Follow these instructions to calculate your total narrow, single-ended SCSI
bus length (including the system unit, external SCSI devices, and SCSI
interconnect cables) using Table 24:
1 Find all of your external SCSI devices in the first column. In the third column,
write the SCSI bus lengths (from the second column) that correspond to your de-
vices.
NOTICE In the third column, the length for the System Unit is already listed. This
number must always be used for the system unit.
2 In the fourth column, write down the lengths of the SCSI interconnect cables you
are using for your installation. (Cable lengths are listed in subsection
“Cables” in the section on “SCSI Restrictions.”
3 Add all of the numbers in the third column and write that number on the subtotal
line at the bottom of the column. Do the same for the fourth column.
4 Add the subtotals together and write the total in the Total SCSI Bus Length box.
NOTICE The total length of the narrow, single-ended SCSI bus must not exceed 6
meters (19.6 feet). If the number you write for Total SCSI Bus Length is
greater than 6 meters (19.6 feet), try configuring your installation with
shorter cables.