IntraServer Technology ITI-90-100250 - Manual (Page 24)

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3
Configuring the SCSI Bus
Some basic SCSI principles must be applied to correctly configure the SCSI
bus on your system.
Termination
Most difficulties with the SCSI bus can be traced to improper
termination and cabling.
The SCSI bus must be terminated at both ends, and only at the ends.
Configure the termination on your IntraServer CompactPCI
®
adapter using
the configuration information in the preceding chapter. Refer to the
documentation for each device on the SCSI bus, to ensure:
1 Devices at the ENDS of the bus have TERMINATION
ENABLED
2 Devices not at the END of the bus have TERMINATION
DISABLED
3 Use LVD/SE termination on the Ultra2 buses.
4 Use active termination for Ultra Wide SCSI.
Automatic SCSI Termination
All IntraServer’s ITI-8000 Series adapters employ automatic termination. In
normal cases, no operator action is required to correctly terminate the SCSI
bus, provided the following rules are observed:
•
Each SCSI bus must be terminated ONLY at the ends. If the
IntraServer ITI-8000 Series module is at the end of the SCSI
bus, the termination will be set Automatically Enabled (the
TERM light will light to indicate the module IS terminating
the bus).
•
If the LVD/SE bus on an ITI-8000 Series module is located on
a bus containing LVD devices, it will automatically set to