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XEROX WorkCentre
3550
Information Assurance Disclosure Paper
9
Ver. 1.3, March 2011 Page 9 of 32
2.2. Controller
2.2.1. Purpose
The controller provides both network and direct-connect external interfaces, and enables copy, print, email, network
scan and LanFAX functionality. Network scanning and LanFAX are standard features. The controller also
incorporates a proprietary web server that exports a Web User Interface (WebUI) through which users can submit
jobs and check job and machine status, and through which system administrators can remotely administer the
machine.
The controller contains the image path, which uses proprietary hardware and algorithms to process the scanned
images into high-quality reproductions. Scanned images may be temporarily buffered in DRAM to enable electronic
pre-collation, sometimes referred to as scan-once/print-many. When producing multiple copies of a document, the
scanned image is processed and buffered in the DRAM in a proprietary format. The buffered bitmaps are then read
from DRAM and sent to the Image Output Terminal (IOT) for marking on hardcopy output. For long documents, the
production of hardcopy may begin before the entire original is scanned, achieving a level of concurrency between the
scan and mark operations.
The controller operating system is pSOS v2.5. The controller works with the User Interface (UI) assembly to provide
system configuration functions. A System Administrator PIN must be entered at the UI in order to access these
functions.
2.2.2. Memory Components
Volatile Memory
Type (SRAM, DRAM,
etc)
Size
User
Modifiable
(Y/N)
Function or U
se
Process to Sanitize
SDRAM 256/512
MB
Expandable
to 512 MB
Main Memory Remove power
Additional Information:
Non-Volatile Memory
Type (
Flash, EEPROM,
etc)
Size
User
Modifiable
(Y/N)
Function or Use
Process to Sanitize
Flash 32 MB No Operating System, PDL
Interpreters, Fonts, MIB, Fax
Journal List, Fax Dialing, Code
used for scheduling the
marking of jobs
None
Flash ROM 1 MB No Backup None
Flash 8 MB No Fax/Font Backup None
Additional Information:
All memory listed above contains code for execution and configuration information. No user or job
data is permanently stored in this location.
Table 2 Controller memory components