ATTO Technology SCSI Sidekick User Manual page 10

Single-Ended to Single-Ended ATTO SCSI Sidekick
Host with
Single-Ended
SCSI Adapter
Figure 4-1: Single-Ended to Single-Ended ATTO SCSI Sidekick in a
In this configuration, the Single-Ended to Single-Ended ATTO SCSI Sidekick is
connected as a SCSI bus extender. The converter has allowed for the cable length of the
SCSI domain to go from 3 meters to 6 meters less the cabling distance required to
connect all of the peripheral devices. The total combined distance of the SCSI domain
is 6 meters less the cabling distance required to connect all of the peripheral devices.
For example, if you have a 7 drive RAID array that requires 1 meter of cabling, the actual
distance of segment 2 would be 2 meters. Please note that your configuration may be
different.
Differential to Single-Ended ATTO SCSI Sidekick
Host Computer
w/Differential
SCSI Adapter
Figure 4-2: Differential Single-Ended ATTO SCSI Sidekick
In this configuration, the cable length of segment 2 has shortened compared to that in
figure 4-1 due to UltraSCSI. With seven devices, UltraSCSI limits you to 1.5 meters
from the host to the last device on the SCSI chain. (Refer to Appendix D for more
details on cable length and device limitations) ATTO SCSI Sidekick helps eliminate
the UltraSCSI limitations. ATTO's Differential to Single-Ended ATTO SCSI Sidekick
allows for you to combine differential and single-ended devices on a SCSI domain.
Notice that the distance between the host computer and ATTO SCSI Sidekick (25
meters for differential interface) is different from the distance between the ATTO SCSI
Sidekick and the device (1.5 meters for single-ended interface). ATTO SCSI Sidekick
takes advantage of differential SCSI that increases your cable lengths significantly. The
total combined distance of the SCSI domain is 26.5 meters less the cabling distance
required to connect all of the peripheral devices. For example, if you have a 7-drive RAID
array that requires 1 meter of cabling, the actual distance of segment 2 would be 0.5 meter.
Please note that your configuration may be different.
Page 6
Terminate
Upper Port
3 Meters
Single-Ended to Single-Ended
ATTO SCSI Sidekick
Segment 1
Non-UltraSCSI Environment
Differential
25 Meters
Differential to Single-Ended
ATTO SCSI Sidekick
Segment 1
in an UltraSCSI Environment
Terminate
Upper Port
Sidekick
Single-Ended
Sidekick
2 Meters
Single-Ended
7-Drive
Segment 2 RAID Array
.5 Meters
Single-Ended
Segment 2 RAID Array
ATTO Technology, Inc.
7-Drive