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data transfers and control processes, including the switching of the
XR900 power supply on and off, occur under the control of the host
computer.
Note
The mass storage drives and power supplies are described in detail
in separate publications. Refer to the Related Documentation section
of this chapter for their titles and publication numbers.
The following sections present an overview of the XR900
enclosure's major assemblies.
Expansion Chassis
The expansion chassis houses the drive enclosure. A backplane
located in the rear distributes DC power and interfaces SCSI signals
to the drives. Power is furnished by a 100W AC or DC power
supply located beside the drive enclosure.
Note
Power Supply
DC power to the XR900 drives and fan assembly comes from a
UL/CSA/VDE-approved 100W autoranging power supply
module. Power supply modules are available in both –48Vdc- and
115/230Vac-compatible versions, each providing +5Vdc and
In applications involving a dual 9-slot system (Modular
Chassis model MC1209), the XR900 chassis serves one
side or the other, but not both at once.
Temperature and humidity limits are determined
primarily by tape and disk drives. Broader temperature
and humidity limits may be possible, depending on the
characteristics of the specific drives installed in the
enclosure.
General Description
1-3
1
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