19
TROUBLESHOOTING The CG3500 has two major functional blocks — cable modem and telephony — as illustrated in the following block diagram:
Line 1 Line 2
Cable Enet
Cable modem
Telephony
CODEC DSP
Power
supply Power
Network
management
agent
Call signalling
Voice
management
Tuner/RF
Downstream
receiver
Upstream
transmitter
MAC
IP
processing
Subscriber
line
interface
Subscriber
line
interface