Not content with using up to 30MHz for powerline working the latest chip from Atheros supports operation up to 75MHz. "The AR7400 Chipset The Atheros Powerline chipset consists of the AR7400 MAC/PHY transceiver and the AR1500 analog front end (AFE) / line driver. The AR7400 chipset is the world?s first solution designed to comply to the IEEE 1901 draft
2.0 standard (now elevated to Sponsor Letter Ballot status), a global, open powerline standard. Just as the IEEE 802.11 standard unified and accelerated the growth of the wireless LAN industry, the IEEE 1901 standard will help to unify and drive the expansion of the powerline networking industry. The 1901 standard utilizes a wider operating frequency band (2 MHz to 50 MHz) than the current HomePlug AV standard (2MHz to 30 MHz), thereby increasing PHY performance in IEEE 1901 operation. The AR7400 chipset will comply with the FFT-OFDM provision of
1901 and incorporates the inter-PHY protocol (IPP) co-existence mechanism.
The chipset also supports operation up to 75 MHz, utilizing all of the practically available spectrum defined in the 100 MHz IEEE 1901 charter, and avoiding the global, high-power FM radio broadcast bands from 76 to
108MHz. This extended frequency range coupled with high density modulation to 4096 QAM, allow AR7400-based powerline products to communicate at more than 500 Mbps PHY rates. In coaxial cable applications, the PHY rates can exceed 600 Mbps, while providing extended coverage due to the AR1500?s lower noise floor and greater output dynamic range. "