
Single-Ended I/O Module
5–4 UltraSCSI RAID Enclosure
Controlling the Internal SCSI Bus
The I/O module controls the internal SCSI bus in the following
manner:
• Isolates the internal SCSI bus from the external SCSI bus
• Provides single-ended SCSI bus termination for each internal bus
• Disconnects the internal SCSI bus from the external SCSI bus
when directed by the EMU
• Distributes TERMPOWER (+5 V dc) to the internal SCSI bus
• Turns O
N the green internal TERMPOWER LED when internal
TERMPOWER is present
• Turns O
FF the green internal TERMPOWER LED when there is
either an internal TERMPOWER overcurrent condition or no
TERMPOWER
Controlling the External SCSI Bus
The I/O module controls the external SCSI bus in the following
manner:
• Provides single-ended SCSI bus termination for the external bus
• Distributes TERMPOWER (+5 V dc) to the external SCSI bus
• Turns O
N the green external TERMPOWER LED when external
TERMPOWER is present
• Turns O
FF the green external TERMPOWER LED when there is
either an external TERMPOWER overcurrent condition or no
TERMPOWER
• Disables the external bus termination when a cable is connected
to the right VHDCI connector
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