Belkin Pre-802.11n Access Point and client cards

Archived from groups: alt.internet.wireless (More info?)

Anyone got one of this working yet? Apparently Comp_USA has 'em.

Not 802.11n but one of the possible configurations. Belkin is quoted as
claiming 800% wider coverage and 600% faster transmissions, max at about 100
Mbps.

--
Bob Alston

bobalston9 AT aol DOT com


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Archived from groups: alt.internet.wireless (More info?)

On 24 Oct 2004 19:06:17 -0700, allen_nospam@benusa.com (Allen Benusa)
wrote:

>Hmmm... those claims are somewhat interesting. Supposedly they are
>able to do it with multiple antennas. Actually the 800% more coverage
>is based on square area, not linear distance. So if your original
>radius was 100 ft, PI*100^2 = 31,415 sq ft. So if a radius was 282.8
>ft, PI*282.8^2 = 251,327 sq ft. 8X (800%) coverage achieved with a
>radius of 2.8X the original.
>- Allen -

That's one way to look at it, where coverage area doubles for every
sqrt(2) increase. An easier way is that coverage area doubles for
every 3dB increase in system gain. Therefore, an 8x increase in
coverage area corresponds to a 9dB increase in system gain. This
assumes everything else is constant such as modulation type, data
rate, error rate, tx power, rx sensitivity, antennas, etc.

Bob didn't mention if the 800% increase in coverage was mutually
exclusive with the 600% (6x) increase in speed. Usually, range and
preformance are interdependent and mutually exclusive. For example,
using the stock antennas, 802.11g will deliver about 30Mbits/sec
thruput, but only up to about 15ft away. Any furthur range implies
either a drop in thruput, or an increase in system gain through
improved antennas.

Notice that the "600% faster transmission" does not specify in
reference to what benchmark. Faster than what? If it's faster than
802.11g at 54Mbits/sec, then 6x would be 324Mbits/sec, which is faster
than the 100baseTX ethernet interface can handle running at wirespeed.
If true, 6x will require the use of a gigabit ethernet interface.

Although enchanced mutations of 802.11g advertise 108Mbits/sec
"performance", I have yet to see anything close to 108Mbits/sec
delivered on the bench or reported in the field. I expect MIMO to be
much of the same hype (or worse).

Also, since there are multiple implimentations of MIMO applying for
802.11n standardization, the IEEE and WI-FI committee are not
particularly thrilled with premature announcements:
http://www.eweek.com/article2/0,1759,1676691,00.asp
http://www.eweek.com/article2/0,1759,1674640,00.asp
http://www.eweek.com/article2/0,1759,1624990,00.asp

Ignoring the hype, the advantage of MIMO is the ability to use
multiple independent paths to deliver data. That means hogging the
entire 2.4GHz band, and utilizing reflections to a much greater degree
than OFDM. My guess(tm) is that it will be no better than some of the
proprietary 802.11g enhancements at short range (due to bandwidth
limitations) and significantly better bandwidth in a high reflection
(office) environment due to a reduction in bit error rate in a
multipath environment.



>
>"Bob Alston" <bobalston9NOSPAM@aol.com> wrote in message news:<PIUed.113224$Lo6.37751@fed1read03>...
>> Anyone got one of this working yet? Apparently Comp_USA has 'em.
>>
>> Not 802.11n but one of the possible configurations. Belkin is quoted as
>> claiming 800% wider coverage and 600% faster transmissions, max at about 100
>> Mbps.
>>
>> --
>> Bob Alston
>>
>> bobalston9 AT aol DOT com
>>
>>
>> ---
>> Outgoing mail is certified Virus Free.
>> Checked by AVG anti-virus system (http://www.grisoft.com).
>> Version: 6.0.782 / Virus Database: 528 - Release Date: 10/22/2004

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 AE6KS 831-336-2558

Archived from groups: alt.internet.wireless (More info?)

On Mon, 25 Oct 2004 04:29:44 GMT, Macross
<Macross.1enzzm@no-mx.forums.yourdomain.com.au> wrote:

>I just got a set, it's great! I use to have issues getting connected
>from my router downstairs to my bedroom upstairs and now I'm connected
>without any disconnects.
>
>I tested my old router which was a D-Link 11g and the furthest distance
>I could go was about 50ft outside my home with the router in my living
>room. I just tried the Belkin Pre-N and I went a good 150ft before
>loosing my connection.
>
>I highly recommend it.

Cool. The range increased 3 times or 9 times the coverage area.
Impressive. By no disconnects, I assume it was a reliable connection.
What connection speed did you get before the signal went away? MIMO
is suppose to NOT reduce connection speed as much at extreme range.
What are you using as a client radio?

(Note: I only know what I've read about MIMO and am typically
sceptical of claims).

Incidentally, I found some better and more sane claims at:
http://www.yenra.com/pre-n/
- 4 times greater coverage than standard 802.11g
- 4 times greater speed than standard 802.11g
- Improved resistance to interference from neighboring Wi-Fi
systems and other 2.4GHz devices
- Improved performance with 802.11b and 802.11g devices whether
employed at the client, AP, or both.
- Does not drop to the lowest common networking speed in mixed-mode
environments
- Seamless compatibility with 802.11b and 802.11g

It will take 3 external antennas to make this work outdoors. I can
just visualize the weird triple antennas. Oh-oh.


--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 AE6KS 831-336-2558

Archived from groups: alt.internet.wireless (More info?)

It is kinda weird looking in a futuristic way. I been using a MIMO
cardbus with one of the two laptops I have and yes no disconnects
within that 150ft in fact I use to get disconnects every few hours with
my old g Dlink router and I have yet to have a disconnect since using
the Belkin preN router. I also have another laptop with a builtin
wireless by Atheroes(?) and I noticed an improve distance with this
aswell.

What's most impressed me so far is that when I use my laptop with the
built in wireless I see two networks other than my own in my area with
the site survey. When I use the Belkin card I see seven networks in my
area! I walked around to see whos networks these could be and one was
two homes away from mine. Unbelievably awesome!


--
Macross
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