BOARDS

5.2 BOARDS

5.2.1 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.

Boards

ROM

Fax Option Type 5002 (D629)

 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

Item	Description
SW1	Switches the SRAM backup battery on/off.