
Downstream Data Channel in
Cable Modem Physical Layer
• Downstream
– The signal received by the cable modem from the CMTS
• Modulation
– 64 QAM and 256 QAM
• Bandwidth
– 6 MHz (USA) & 8 MHz (EU) occupied spectrum that coexists
with other signals in cable
• Frequency
– 42-850 MHz (USA) and 65-850 MHz (EU)
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