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Connecting to external interfaces
Issue 3.3 February 2003 41
Connecting external SCSI devices
This section describes how to connect the SCSI devices (tape drives and disk drives) to
the Ultra 5 computer. SCSI devices connect to either the SunSwift card or to the
Dual-Channel UltraSCSI card.
SunSwift connections
The following figure shows how to connect UniPack SCSI disk drives and tape drives to a
SunSwift card. A 68-to-68-pin SCSI cable connects from the SunSwift PCI card on the
back of the computer to the IN connector on the back of the SCSI device that is closest to
the computer. If you have more than one SunSwift card, connect the drives to the card in
the lowest slot number. A 68-to-68 pin SCSI cable connects from the OUT connector of
that device to the IN connector of the next device. Continue this process until all assigned
devices are connected in the SCSI chain.
.
When connecting SCSI devices, the last device in the chain MUST be terminated, either
via an auto-terminated device or with a manual terminator.
When using an auto-terminated SCSI device, you do not need to connect a SCSI
terminator to the OUT connector of the last SCSI device in the chain. To verify that the last
device is auto-terminated, check the LEDs labeled Auto Term High and Auto Term Low on
the back panel of the device. In a CMS configuration, both LEDs are lit on the last device in
the SCSI chain. If a device in the SCSI chain is not the last device, neither termination LED
is lit.
When using a manually-terminated device, you must connect a SCSI terminator to the
OUT connector of the last SCSI device in the chain. When you connect the SCSI
terminator to the OUT connector, the LED on the terminator is lit.
Stack of three
external SCSI devices
SunSwift card
in PCI slot 2
Back panel of Ultra 5
IN
IN
IN
OUT
OUT
OUT
68-to-68 pin SCSI cable
Target
address
switch
68-to-68 pin SCSI cable
scsi_sunswift.cdr