Sigma Designs fast fall had taped out on its CG5111-plus-CG5113 power-line-networking chip set and forecast that first silicon would become available by the end of 2010 (Reference A). As far as I know, the CG51 1x chip set is the first product to implement the ITU (International Telecommunications Union)-sanctioned G.hn networking standard. Sigma Designs also claims that it supports HomePlug AV (audio/video) and the IEEE 1901 follow-on, thereby enabling it to bridge the divergent standards. The company's proprietary ClearPath and ClearPath Extreme extensions allow for power-line packet transfer over not only the traditional phase-plus-neutral pair but also optionally instead using the power grid's earth connection. The extensions also enable simultaneous MIMO (multiple-input/multiple-output) broadcast and reception of multiple signals over multiple ac-wire pairs.
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