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Table 2-I. Troubleshooting Checklist (continued)
Are the SCSI bus
terminators correctly
installed?
Both ends of the SCSI bus require termination. The
terminator on the host adapter is installed at the factory.
An external terminator is supplied for terminating the last
device on the bus.
Does any device require a
special SCSI terminator?
Some external devices may have peculiar termination
requirements. The device manual should explain any
special termination requirements and how to avoid
problems.
Does any peripheral device
have an internal SCSI
terminator?
Excessive termination may cause damage to the
transceivers of all the devices on the bus, including the
adapter card, or may cause unreliable operation. Check
the device manuals to determine whether they have
internal terminators and how to avoid overloading the bus.
Are all devices that can
supply termination power
configured to do so?
For optimum noise immunity, we recommend that devices
be configured to supply TERMPWR when possible. If at
least two devices supply TERMPWR, locate them at each
end of the SCSI bus, Additional devices that supply
TERMPWR can be evenly distributed along the bus.
2-8 Service Information