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Homegrid Forum says yes to draft ITU-T mimo specification for extending G.hn
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Homegrid Forum says yes to draft ITU-T mimo specification for extending G.hn

Posted by Steve RogersonMay 5, 2011

The Homegrid Forum is backing the ITU-T Study Group 15’s draft standard (ITU-T G.9963, or G.hn-Mimo) that adds mimo (multiple input multiple output) technology to the G.hn standard for high-speed networking over existing home wiring.

The fourm believes that adding mimo will significantly increase robustness, rate and coverage, making G.hn by far the premier home networking technology, especially in difficult noise environments such as powerlines in the home.

The ITU-T experts in the G.hn work group last year completed the development of the G.hn standard for networking over existing home wiring (such as powerlines, phone lines and coaxial cable). Since then, it has been developing a new standard that adds mimo to G.hn. The specification is initially focusing on powerline as this is the most difficult wired medium.

Mimo works by using the multiple paths available because power wires have three conductors (phase, neutral and ground). G.hn-Mimo standard devices will be able to send traffic streams over multiple paths simultaneously and thus increase throughput rates and noise robustness. In cases where a communications path is affected by impairments, other paths can be used to compensate and hence ensure full coverage and persistent delivery of content.

ITU-T G.9963 is the first powerline mimo specification to be developed by an international SDO (standards development organisation). As G.hn-Mimo is an enhancement to G.hn, G.hn devices with mimo are fully interoperable with devices built to the G.hn standard approved in 2010.

The technical work on G.hn-Mimo is due for completion by July 2011, with consent (official ITU-T recommendation status) expected in autumn 2011.

“Service providers and equipment vendors that are planning to start G.hn deployments this year need to have a clear view of the G.hn road map and which enhancements are coming,” said Matt Theall, president of the Homegrid Forum.

“G.hn is already the best standards-based solution for any wired home networking application, and the G.hn-Mimo enhancements will ensure that G.hn will continue to be the best for years to come.”

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