This has got to be a joke.
How long has 802.11n been in development?
It has not yet been ratified and currently available draft product does not deliver 100 mbps throughput in a real world environment.
And whilst I'm about it - are you talking "theoretical gigabit" in the same way that 802.11a & g are theoretically 54 mbit?
It's time the industry started being realistic.
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IEEE802.11 VHT and Power
As stated in the Network World webinar "PoE Plus: Impact on the PoE Market", WLAN is one of the major drivers for the creation of IEEE802.3at, which at this point allows the delivery of up to 25.5W to powered devices.
If this seems to be enough for most IEEE802.11n access points (the enterprise grade ones take around 18W), 25.5W may be too little for VHT.
It would be interesting tosee how this new study group would affect the work of IEEE802.3at. Will the PoE Plus task force include an extension ofup to 51W to the standard, or will this be a future option, which can further hinder the adoption of IEEE802.11 VHT?
Power
John W. Cox senior editor Network World
Dan,
thanks for posting this. As I mentioned in our email exchange, my reaction was "I wish I'd thought of that."
The 11n power picture is still developing.
There seems to be pretty rapid adoption of 11n in some verticals, notably education, and they seem to be adopting a mix of solutions, or putting off a decision until .3at is ratified and standards-based products are available. In the meantime, they're accepting some performance trade-offs at the 11n access point.
One or two vendors say they have some secret sauce that allows full 11n radio operation with existing 802.3af systems (Siemens is one).
Our wireless newsletter whiz, Joanie Wexler, has written about 11n power issues, including a two-part overview here and here.
Power is also a moving target. On the 11n side, we can expect that radio silicon advances will lower power consumption. And the IEEE VHT working group could, I suppose, target low or lower power requirements or at least coordinate some discussions with the 802.3at folks.
One thing I'm unsure of is whether the higher throughput at either under-6 or 60 GHz would really demand signifcantly more power. 802.11a at 5GHz was a huge throughput jump over 11b at 2.4GHz, but stayed well within existing PoE capabilities.
Pulleease
John W. Cox senior editor Network World
It's not more of a joke than developing 802.11g and 11a while 11b was the shortlived standard. The technology exists for very high wireless throughput.
The VHT standard, like the 11n standard, is aimed at throughput.
802.11a and 11g have a data rate of 54Mbps. The WLAN overhead in the IEEE standard reduces the actual useable throughput for associated clients to the range of 20-25Mbps.
Our October 2007 tests, by Craig Mathias, of several first-generation 11n access points aimed at the SMB market found a range of performance levels, most indeed under 100Mbps. But from what I can see, plenty of 11n products today have demonstrated throughput over, sometimes way over, 100Mbps.
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