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Boards

5.2.2 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

Boards

Fax Option Type 5002 (D629)

Fax Option Type 5002 (D629)

Fax Option Type 5002 (D629)

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

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