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XEROX WorkCentre
3550
Information Assurance Disclosure Paper
12
Ver. 1.3, March 2011 Page 12 of 32
2.5. Local User Interface (LUI)
2.5.1. Purpose
The LUI detects hard button actuations, and provides text and graphical prompts to the user. Images are not
transmitted to or stored in the LUI. The Start hard button is located on the LUI panel.
2.5.2. Hardware
Volatile Memory Description
Type (SRAM, DRAM, etc)
Size
User Modifiable
(Y/N)
Function or Use
Process to Clear:
RAM 2KB N User Interface volatile memory; no
user image data stored
Power Off System
Additional Information:
All memory listed above contains code for execution and configuration information. No user or job data is permanently stored in this location.
Non-Volatile Memory Description
Type (Flash, EEPROM, etc)
Size
User Modifiable
(Y/N)
Function or Use
Process to Clear:
PROM 64KB N No user image data stored None
Additional Information:
All memory listed above contains code for execution and configuration information. No user or job data is stored in this location.
Table 6 User Interface memory components
2.6. Marking Engine (also known as the Image
Output Terminal or IOT)
2.6.1. Purpose
The Marking Engine performs copy/print paper feeding and transport, image marking and fusing, and document
finishing. Images are not stored at any point in these subsystems.
2.6.2. Hardware
The marking engine is comprised of paper supply trays and feeders, paper transport, laser scanner, xerographics, and
paper output. The marking engine contains a CPU, BIOS, RAM and Non-Volatile Memory.
2.6.3. Control and Data Interfaces
Images and control signals are transmitted from the main controller to the marking engine across a proprietary
interface.