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C
3: C
HAPTER
The ATTO SCSI Sidekick is available in both single-ended to single-ended and
differential to single-ended versions. The single-ended to single-ended (USUS) ATTO
SCSI Sidekick utilizes standard single-ended SCSI and requires the use of single-ended
devices. The differential to single-ended (UDUS) ATTO SCSI Sidekick utilizes
differential and single-ended SCSI and requires the use of differential and single-ended
devices. To determine which model you own, check the label located on the bottom of
the unit. The model you have will be printed on this label.
Cabling Requirements
The ATTO SCSI Sidekick has two industry standard 68-pin "P" (16-bit) connectors on
each side of the unit. Though there are two connectors on each side of the unit, there is
only a single SCSI bus.
If using a combination of Wide 16-bit devices and Narrow 8-bit devices on the same
connector, Wide devices must be connected first (closest to the connector), followed by
the Narrow devices. Please refer to the documentation you received with your SCSI
devices to determine if your devices are Wide or Narrow, and if it is an UltraSCSI
device.
Termination
The SCSI bus is a chain of SCSI devices. A terminator must be placed at each end of a
SCSI device chain. A SCSI device chain can be configured in three different ways: an
internal SCSI device chain, an external SCSI device chain, and an internal/external
SCSI device chain. The devices at both ends of any SCSI chain must be terminated in
order for the SCSI bus to function correctly.
To terminate your ATTO SCSI Sidekick simply place a terminator on the open port on
each side of the unit. Be sure to use a single-ended terminator on the single-ended side
of the unit and a differential terminator on the differential side of the unit. Please keep
in mind that this terminates the ATTO SCSI Sidekick unit only. Termination is still
required at each end of the SCSI chain. The following diagram illustrates termination
on ATTO SCSI Sidekick:
Connector
Terminated
Connect to
Device
Figure 3-1: Terminating and Connecting Devices to ATTO SCSI Sidekick
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T
ABLE AND
ERMINATION
Connector
Terminated
Connect to
Device
ATTO Technology, Inc.
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