Next Generation Access Architecture Options For Additional Upstream And Downstream Transmission On HFC (2011)
By Jorge D. Salinger, Comcast Cable
HFC networks currently have an US capacity limited by the available spectrum. Typically, North American networks are limited to the 20-30 MHz of spectrum these systems have available between 5 and 30 or 42 MHz, and European systems have an additional 25 to 45 MHz of available spectrum. At 6.4 MHz of channelization and QAM64 modulation, assuming complete use of the available spectrum, this capacity allows transmissions of 100-300 Mbps.
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