BOARDS
SM 113 B779
Fax Option
B779
4.2.3 SG3 BOARD
The SG3 board allows up to three simultaneous communications when used in
combination with the FCU and optional G3 boards. The NCU is on the same board
as the common SG-3 board. This makes the total board structure smaller. But, the
specifications of the SG3 board do not change.
NCCP (New Communication Control Processor)
• Controls the SG3 board.
• CPU (RU30)
• DPRAM (Dual Port RAM): Handshaking with the FCU is done through this block.
• DMA controller
• JBIG
• DSP V34 modem (RL5T892): Includes the DTMF Receiver function
•
DCR for MH, MR, MMR, and JBIG compression and decompression
FROM
• 1Mbyte flash ROM for SG3 software storage and modem software storage
SDRAM
• 4Mbyte DRAM shared between ECM buffer, line buffer, and working
memory
AFE (Analog Front End)
• Analog processing
CODEC (COder-DECoder)
• A/D & D/A conversions for modem
REG
• Generates +3.3 V from the +5V from the FCU
SG3-D
SG3-D
FCU
NCCP
FROM
(1MB)
SDRAM
(8MB)
CODEC NCU
REG
DSP
(modem)
DMAC
CPU
(Ru30)
JBIG
DCR
DPRAM
AFE
+5V +3.3V
G3 Board
Line
B779D903.WMF
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