Sig4 Board - Ricoh B082 Service Manual

BOARDS

4.2.5 SIG4 BOARD

Reset
Circuit
The SiG4 (Standard ISDN G4) board contains ICCP (ISDN Communication Control
Processor), Flash ROM, DRAM, LAPD controller, CODEC, ISDN interface and
analog interface. The ICCP controls the entire board.
ICCP (ISDN Communication Control Processor)
• 16 bit CPU which controls the entire board
• HDLC control
• Channel select for B channel interface control
CODEC
• A/D, D/A converter for ISDN G3 communication
LAPD Controller
• ISDN layer 1 and LAPD control
ROM
• 512 kB (4 Mbit) Flash ROM for system software storage
DRAM
• 2MB (16 Mbit) DRAM used
B547
Flash
DRAM
ROM
SYSTEM BUS
Dch
Bch
ICCP
CODEC
FCU
SiG4
LAPD
Controller Interface
Analog I/F
Circuit
MODEM
124
ISDN
ISDN
H548D500.WMF
SM