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C.3
SCSI Cable Length
Note – Do not use the onboard SCSI connector of the I/O+ board in slot 1.
The onboard SCSI connector for the board in slot 1 connects to the media tray at the
front of the system (the media tray contains the CD-ROM drive and a slot for an
optional second SCSI drive).
You can connect SCSI devices to the onboard SCSI connector on an I/O+ board in
any slot except slot 1.
You can use the SBus slots on any I/O+ board for SCSI interface cards.
The maximum combined length for a string of SCSI cables is 6 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 C-4 lists measurements for Enterprise servers.
TABLE C-4
C.4
Internal SCSI Lengths (Approximate)
Location
Internal Length
SBus+ I/O board
0.43 meter
Graphics+ I/O board
0.43 meter
SCSI Termination
The I/O+ board in slot 1 of any Enterprise server must be terminated. This slot
connects to the internal CD-ROM drive and optional tape drive.
The SCSI bus on an I/O+ board in any other slot must be terminated only if SCSI
devices are connected to that board.
Appendix C
SCSI and FC-AL Devices
C-3