Chapter 2: Theory Of Operation - ATTO Technology SCSI Sidekick User Manual

C 2: T
HAPTER
ATTO SCSI Sidekick is an operating system (OS) independent UltraSCSI device that
does not occupy a SCSI ID. This frees all of the SCSI IDs for devices connected to your
system. One of the main features of ATTO SCSI Sidekick is that it allows you to
combine differential and single-ended devices on a SCSI domain. By segmenting the
SCSI bus and regenerating the SCSI signal, you can mix single-ended and differential
SCSI devices on a SCSI domain. ATTO SCSI Sidekick needs to be physically installed
between the target and initiator. The SCSI signal is received from the initiator,
regenerated by ATTO SCSI Sidekick, and then passed on to the target. The
ATTO SCSI Sidekick is bi-directional device that accepts a signal from either side to be
regenerated and passed on to the target device.
Host Computer
w/Differential
SCSI Adapter
Figure 2-1: Differential to Single-Ended ATTO SCSI Sidekick
•
Connect Single-Ended and Differential Devices on the Same SCSI domain
•
Extend the SCSI Bus and Break the UltraSCSI Cable Limitations
•
Isolate Bus Segments and Avoid Unnecessary Interruptions
ATTO SCSI Sidekick (USUS/UDUS) User's Manual
HEORY OF
Differential
25 Meters
Differential to Single-Ended
ATTO SCSI Sidekick
Segment 1
in an UltraSCSI Environment
O
PERATION
Single-Ended
1.5 Meters (Less
Sidekick
cabling for tower)
Single-Ended
7-Drive
Segment 2 RAID Array
Page 3