FCU

The FCU (Facsimile Control Unit) controls fax communications, the video interface to the base copier’s engine, and all the fax options.

FACE3.5 (Fax Application Control Engine)

• CPU
• Data compression and reconstruction (DCR)
• DMA control
• Clock generation
• DRAM backup control

Modem (FAME2)

• V.34, V33, V17, V.29, V.27ter, V.21, and V.8

DRAM

• The 16 MB of DRAM is shared as follows.
  
  • SAF memory: 4MB
  • Working memory: 4MB
  • Page memory: 8MB
  • The SAF memory is backed up by a rechargeable battery.

ROM

• 4MB flash ROMs for system software storage

SRAM

• The 512 KB SRAM for system and user parameter storage is backed up by a lithium battery.

Memory Back-up

• A rechargeable battery backs up the SAF memory (DRAM) for 12 hours.
• A lithium battery backs up the system parameters and programmed items in the SRAM, in case the base copier's main switch is turned off.

Switches