G.hn Silicon Emerges from Vaporware Territoryby Ganesh T S on February 2, 2011 3:33 PM EST
- Posted in
- Powerline Adapters
CopperGate got hold of HomePlug AV silicon through their Conexant acquisition, and Sigma Designs got into the fray through the acquisition of CopperGate. Their Homeplug AV product CG2110 was unveiled in October 2009 In October 2010, I visited Sigma Designs and had the chance to see a working consumer product based on that chipset.
The interesting aspect was ClearPath, and this enabled the product to work in a much more efficient manner even in noisy environments and Power strips are a major no-no for the Intellon/Atheros based networking kits, but the units demonstrated by Sigma actually seemed to like communicating through them! The demonstrated product was supposed to ship to consumers in November, but they are yet to go on sale. Sigma currently says it will begin shipping towards the end of February.
The HomePlug product from Sigma also seemed to perform better than the Intellon/Atheros solutions in noisy situations. The reason for this attributed to ClearPath technology which relies on proprietary algorithms to find a way around the noise.
It would be ideal If what I saw in the labs translates to real world performance when products based on the CG2110 hits consumers. It looks like Sigma Designs is a generation behind Atheros in the HomePlug AV market. However, they seem to be delivering what Atheros should have done in the first place. All said, controlled lab demonstrations can only be trusted to a certain extent. The performance of these units once they are sent to reviewers and end consumers will reveal the true story.
CopperGate's Vision of the Wired Networking Industry (March 2009)
Even as CopperGate was acquiring Conexant's HomePlug technology, it was envisaging that G.hn would win the ultimate battle for wired networking technologies. After all, it was the proverbial holy grail, encompassing support for coax, phone lines and powerline in one product with promises of upto 1 Gbps bandwidth. In the above timeline presented by CopperGate in early 2009, it was expected that G.hn would completely replace HomePNA and HomePlug for phone and powerline networking in 2012. CES 2011 presented Sigma Designs / CopperGate with the ideal opportunity to show us what was being done towards achieving that goal.
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wolrah - Thursday, February 3, 2011 - linkSorry bud, but you're completely wrong. Look up the G.hn specs yourself. Depending on the region, on power lines it'll use anywhere from 1-200MHz. The power lines in your house are in general unshielded, making them effectively an enormous (though not particularly well optimized of course) antenna. The frequencies in use overlap with numerous radio bands, including a number of amateur bands, CB, commercial AM/FM, and commercial/government SW/MW/LW. I don't believe most public safety spectrum at least here in the US is that low down, but there probably is some. Particularly in amateur HF and SW/MW/LW being able to receive weak distant signals is important, so any interference on those bands is an annoyance to area users.
I'm not sure why you bring up cordless phones. BPL and power-line networking don't come anywhere close to those, so there's no reason to think it passing the "teenage girl test" means anything at all (900MHz, 1.8GHz, 2.4GHz, and 5.8GHz are the four cordless phone frequencies seen in the US).
Again it will not interfere with any unlicensed radio services I'm aware of other than CB, but you're putting a fat signal in to a huge antenna right in the middle of a lot of licensed spectrum. The area of effect isn't huge, but as an amateur operator if you were my neighbor and you were broadcasting anything on the HF bands I'd offer to help fix it if possible, but if it couldn't be told to not operate in certain ranges it's turning off or you're getting an FCC complaint for broadcasting without a license and interfering with licensed users.
derkurt - Sunday, February 6, 2011 - linkI don't know exactly about the new G.hn devices, but a HomePlug AV2 500 Mbit/s device uses a spectrum from 2-68 Mhz. The standard employs these frequency filters (source: German wikipedia):
* f ≤ 1,71 – AM Broadcast and below
* 1,71 < f < 1,8 – between AM and 160 meters band
* 1,8 ≤ f ≤ 2,0 – 160 meters amateur band
* 3,5 ≤ f ≤ 4,0 – 80 meters amateur band
* 5,33 ≤ f ≤ 5,407 – 5 MHz amateur band
* 7,0 ≤ f ≤ 7,3 – 40 meters amateur band
* 10,10 ≤ f ≤ 10,15 – 30 meters amateur band
* 14,0 ≤ f ≤ 14,35 – 20 meter amateur band
* 18,068 ≤ f ≤ 18,168 – 17 meter amateur band
* 21,0 ≤ f ≤ 21,45 – 15 meter amateur band
* 24,89 ≤ f ≤ 24,99 – 12 meter amateur band
* f >= 28,0 – 10 meter amateur band
In Germany, you are allowed to use Powerline devices as long as they don't interfere with other HF applications in your neighborhood. If they do, the Bundesnetzagentur (German FCC) can be called, which may request removal of the source of interference.
So far, I haven't heard of a single case where a radio amateur successfully requested removal of a HomePlug device. Keep in mind that the amateurs are likely to be the only ones which might be disturbed by PLC at 2-68 Mhz. In fact, as far as I know, the filters mentioned above cover all frequencies where a radio amateur is legally allowed to operate within the 2-68 Mhz range. Also, although PLC is admittedly turning the power wiring into an antenna, the signal strength remains small compared to other in-house HF applications, such as Wi-Fi.
In theory, PLC is a "dirty" solution and looks like it would be bound to cause problems. In reality, devices such as mobile phones, babyphones (which also use the power lines), and even WLAN are far more likely to annoy your neighbor.
davmat787 - Sunday, February 6, 2011 - linkExcellent post sir. Just the kind of complete and detailed post one would expect from a German. :)
HoosierEngineer5 - Thursday, February 3, 2011 - linkDo any of these technologies replace the X-10 modules, or are they simply replicate Ethernet? It would be great if these could actually DO something other than pass data...
andrewmc - Thursday, February 3, 2011 - linkVery nice. So when do I get my Homeplug Green PHY silicon.
aahjnnot - Friday, February 4, 2011 - linkPowerline networking is relatively successful in Europe and Asia compared with North America because our housing stock is very different from yours. WiFi isn't a good solution in areas of very dense population, as interference from neighbouring networks can kill throughput. Traditional European housing stock with thick internal walls made of brick or stone kills WiFi, and the long, narrow shape of traditional British terraces mean that Wifi users can often have several neighouring networks that are closer than their own access point. And retro-fitting Ethernet into a property with traditionally plastered walls, stone floors and no wall voids needs either visible cabling or significant redecoration.
By contrast, the traditional American wood-built detached property sitting in its own spacious yard is perfect for WiFi.
ragincajun84 - Wednesday, February 9, 2011 - linkIs this a paid article? It reads like an ad for Sigma and G.hn. It barely mentions the other silicon players yet raves about Sigma demos and slideware. Sigma has not brought a single powerline product to market and G.hn has been hyped for 5 years and still has no products on the market.
ganeshts - Thursday, February 10, 2011 - linkI believe I have pointed out enough places where G.hn is yet to catch up or will have potential problems.
I wrote the article after seeing Sigma's demonstrations both at their HQ in CA as well as their demo at CES. It really works in the demo situation / lab. Any new company will have teething trouble, trying to get into the market and convince customers. That doesn't mean the technology is not good. Yes, G.hn will have to present a really valid case to the concerned people to shift from HomePlug because HomePlug is very well established and mature.
At CES, after seeing what Atheros and Sigma had to offer, I believe Sigma has taken bigger strides and that is why 75% of the article is focused on them. (They have taken bigger strides because G.hn hasn't seen mature silicon yet). This article wasn't meant to be a coverage of the PLC industry as a whole.