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B-2 Ultra Enterprise 6000/5000/4000 Systems Manual—November 1996
B
B.3 SCSI Cable Length
The maximum combined length for a string of SCSI cables is six meters for
non-differential cables. For differential SCSI cables, the maximum is 25 meters.
To calculate the total length of a SCSI string, include external cables, internal
cables, and printed traces. Table B-3 lists measurements for Enterprise servers.
B.4 SCSI Termination
The I/O board in slot 1 of any Enterprise server must be terminated. This slot
connects to the SCSI tray through cables and a connector on the centerplane.
An I/O board in any other slot does not require termination if no devices
connect to the SCSI bus on that board.
Table B-2 Disk Board Default SCSI Disk Drive ID Numbers
Board Slot Disk 0,1 Board Slot Disk 0,1
0 4,5 1 6,7
2 or 14* 0,1 3 or 15* 10,11
4 2,3 5 12,13
6 8,9 7 14,15
*Enterprise 6000 systems: Disk boards can only be installed in slots 14 and 15.
Table B-3 Internal SCSI Lengths (Approximate)
Location Internal Length Comments
Enterprise 6000 slot 1 3.7 meters Includes I/O board traces and cables to SCSI tray
Enterprise 5000 slot 1 3.7 meters Includes I/O board traces and cables to SCSI tray
Enterprise 4000 slot 1 1.4 meters Includes I/O board traces and cables to SCSI tray
SBus I/O board 0.43 meter Includes board traces only
Graphics I/O board 0.43 meter Includes board traces only
Disk board 0.64 meter Includes board traces only