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Xerox Document Centre Reference Guide Page 12 - 31
12. Reference
Document Centre Document Security Note
The following discussion summarizes how remote and local service
tools interact with the Document Centre 490/480/470/460 DC/ST as
well as the state of customer image data when the job is complete.
Service
The Document Centre can be accessed locally through a Portable
Service Workstation (PWS) or remotely through the optional Sixth
Sense feature using a standard telephone line. Both tools are
designed for the same purpose, to assist with the service of the
machine. The Sixth Sense feature allows Xerox Service Personnel
to diagnose problems the customer is having with the machine to
either fix the machine during a session or prepare for a service call.
The capabilities of the PWS and Sixth Sense are similar: running
diagnostic programs, collecting fault information, and reading and
modifying control parameters.
These tools do not provide access to any customer image data
. There
is no connection to where the data exists in the system from either
the PWS or Sixth Sense. The sole interaction with the printing
function for service personnel is the ability to request the system to
print internally-generated test patterns.
Customer Job Life (Images)
For a copy job, as a customer job is scanned, the information is
stored in RAM (random access memory) and is transferred to the
image disk, an internal hard disk drive. The image information on
the image disk is virtually encrypted because it is compressed with
a non-standard format and is stored with non-deterministic location
and size. The machine knows where the data resides because a series
of ‘pointers’ contained in RAM identifies the location and
compressed size of each image. Whenever a job is completed, or
whenever power is turned off, the information in RAM is cleared,
resulting in the inability for the machine to ever access the data
again. Subsequent images will overwrite the compressed data on
RAM and on the image disk. This means that no one else has the
ability to print your job on either the present 490/480/470/460
Digital Copier or any other one.
A print job uses a separate hard drive. The ESS hard drive in the