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Network World - Companies will be able to buy plenty of Gigabit Wi-Fi gear in 2014, but they may not get Gigabit Wi-Fi data rates.
Gigabit Wi-Fi, which refers to the IEEE 802.11ac almost-standard, can vary widely in data rates depending not only on its implementation in a radio, but also on how far a client is from an access point or hotspot. It runs only in the 5-GHz band, which in theory propagates less well compared to the crowded, channel-challenged 2.4-GHz band.
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Eric Geier reviewed a selection of 11ac USB adapters and a PCI Express card for Network World, and his tests vividly show the range issues. “In terms of performance, when tested at a distance of 25 feet from our access point, with one wall in between, our top performer was the ASUS [PCIE] card, with a maximum throughput of 280Mbps and an average of 169Mbps,” he writes. “That’s pretty fast, but not close to the Gigabit speeds promised by the 802.11ac standard. However, when we moved the laptop to within a foot of the access point, performance skyrocketed to 800Mbps.”
Enterprise WLAN vendors are introducing aggressively priced 802.11ac access points, and more and more dongles and mobile devices have this newest version of Wi-Fi. Market researchers are forecasting rapid growth in 2014.
IDC says about 249,000 11ac enterprise-class access points shipped in 2013, with revenues of about $130 million. “That’s barely a dent in the market,” says Nolan Greene, IDC research analyst. The dent will be much bigger in 2014: IDC forecasts 1.6 million units, and about $700 million in revenues.
Enterprise 11ac access points will constitute about 10% of the market in 2014, compared to below 5% in 2013, says Chris DePuy, vice president of wireless LAN research for Dell’Oro Group. Third quarter 2013 sales jumped 10% with new entrants, such as Ubiquiti Networks.
The bulk of the buying will be what’s called “Wave 1” 11ac, with a maximum data rate of 1.3Gbps if the radios support three spatial streams, use 80-MHz channels, and are pretty close together. However, most of the early client-side implementations in laptops (and potentially tablets) support two or, in the case of smartphones, one spatial stream. As a result, performance is well under 1.3Gbps but still up to roughly double what’s possible today with 802.11n connections in optimal conditions.
Wave 2 products, due out late in 2014, will include a number of tweaks and additions, including multi-user MIMO, that will double the maximum possible data rate to 6.9Gbps.