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Figure B-2
SCSI Termination Guidelines
•
The SCSI device at the end of a daisy chain must be electrically terminated.
•
Only the last device in a SCSI daisy chain is terminated.
•
Any fast SCSI device or a daisy chain of fast SCSI devices must be
terminated with a regulated terminator.
•
Any configuration with an External Expansion Module (EEM) or an
External Storage Module (ESM) must have a DDP as the last device to
provide regulated term power.
50-pin Ribbon Connectors
Devices with the 3-row 50-pin D connector or the 50-pin ribbon connector (old-
style connectors) should not be used on the same bus with fast SCSI devices.
Note – The mixing of fast SCSI devices and old-style connectors in the same
daisy chain is not recommended since errors may be created and performance
may be degraded.
If fast SCSI devices and old-style connectors must be used in the same system,
the old-style connectors should be connected to a separate SCSI port that
doesn't contain fast SCSI devices.
If you are using SunOS 4.1.3 (Solaris 1.1) or a later version with a fast SCSI bus,
you must turn off the fast bus or performance will be degraded.
Small Computer Systems Interface Information
Regulated and Nonregulated Terminators
B
B-7
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