
Downstream Data Channel in
Cable Modem Physical Layer
• Data rates
– 27-56 Mbps
• Continuous stream of data with no implied framing,
provides complete PHY and MAC decoupling
• Downstream data is received by all cable modems
– The total bandwidth is shared between all active cable
modems on the system
– Each cable modem filters out the data it needs from the stream
of data
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