Interface Cable Specifications; Configuring The Powerloader - Overland Storage PowerLoaders AIT-2 User & Installation Manual

S U R M
ETTING P THE ACK OUNT
To connect a PowerLoader™ to a host computer, the host must have at least one Wide SCSI
controller and the appropriate driver software. The controller must be LVD/SE or differential,
as required to match the module interface.

Interface Cable Specifications

•
PowerLoader™ is a high-performance system. To avoid degradation of performance, use the
highest-quality interface cables from a reputable manufacturer of computer cables. All SCSI
cables used with the PowerLoader™ should meet the following requirements:
•
Shielded or double-shielded, as required to meet EMI specifications
•
Impedance match with cable terminators that meet current SCSI specifications
•
Characteristic impedance between 72 and 96 ohms for single-ended and between 115 and 160
ohms for differential
•
34-pair twisted-pair
•
Each end of a twisted pair ground connected to chassis ground
•
Maximum cable length of 5 feet (1.5 m) for the LVD/SE model in single-ended mode
connected to a host SCSI adapter capable of Ultra SCSI speed
•
Maximum cable length of 40 feet (12 m) for LVD/SE SCSI bus
•
Internal cable lengths of 22 inches for Drive 1 and Robot and 15 inches for Drive 2
•
Cables of different impedances should not be used together.
Additional specifications to assure the highest SCSI performance can be found in the current
version of ANSI X3.131.
This equipment has been tested for electromagnetic emissions and immunity using good
quality shielded cables. If you use unshielded or poor quality cables, or otherwise vary
from good practice, you may not comply with national and international rules.

Configuring the PowerLoader™

The PowerLoader™ is designed with many configuration options, each offering multiple
settings to support a variety of applications and platforms. The setting of each option is stored
in non-volatile memory in the module. For most applications, you do not have to change the
factory default settings. If you need to change the configuration, go on to the next section. If you
are uncertain whether you need to change a setting, contact your Technical Support
representative.
To change settings, use the Control Panel. For an overview of how the Control Panel works, and
a description of the functions of the buttons, indicators and display, refer to Entering the Menu
Mode, Exiting the Menu Mode, and Navigating through the Menu Structure in
You can change the settings using the procedure in How to Customize Configuration later in
this chapter. Consult your host computer and software documentation to determine which
settings you might have to change.
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2-14 Installation
M
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Chapter 3.