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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

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Xerox DC User Manual Page 283