
How Do Cable Modems Work?
• Connect the Cable Modem to the TV outlet for your cable TV
• The cable TV operator connects a Cable Modem Termination
System (CMTS) at their end (the Head-End)
– The CMTS is a central device for connecting the cable TV network to a data
network like the Internet
Upstream Demodulator
QPSK/16-QAM
Downstream Modulator
64-QAM /256-QAM
Upstream Modulator
QPSK/16-QAM
Downstream Demodulator
64-QAM /256-QAM
CMTS (Head-End) Cable Modem
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