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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 single-ended stan-
dard SCSI-2 bus and the fast, wide SCSI 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 devices, and SCSI-
2 interconnect cables) using Table 20:
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.
2 In the fourth column, write down the lengths of the SCSI-2 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-2 Bus Length box.
NOTICE The total length of the single-ended standard SCSI-2 bus must not exceed 6
meters (19.6 feet). If the number you write for Total SCSI-2 Bus Length is
greater than 6 meters (19.6 feet), try configuring your installation with
shorter cables.
If you have problems, call your designated service representative.