Document Centre Document Security Note; Service; Customer Job Life (Images) - Xerox Document Centre 255 LP Reference Manual

Document Centre Document Security Note

The following discussion summarizes how remote and local service
tools interact with the Document Center 255 and 265 LP as well as
the state of customer image data when the job is complete.

Service

The Document Centre 255 and 265 can be accessed locally through
a Portable service Workstation (PWS) or remotely via Sixth Sense
on 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 in, the information is
contained 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 identify 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 265/255 Digital Copier
or any other one.
A print job uses a separate hard drive. The ESS hard drive in the
Print Controller stores the print jobs in the Page Description
Xerox Document Centre Reference Guide Page 8 - 11