Tom,
You make a very good point that 5.3 GHz should be used wherever possible
while reserving 5.8 for longer-distance backhauling and supercell use.
We should all be thinking in terms of using 5.3 whenever we can and
reserving the higher-power 5.8 authorization for those situations where
we really, really need it.
jack
Tom DeReggi wrote:
Or realize that everyone in the world is using the precious 5.8Ghz
spectrum already for long critical links, that are limited to 5.8Ghz for
PtP rule higher SU antenna, or long distance.
5.3Ghz is an ideal backhaul channel for MESH, up to 7 miles (with 2 ft
dish), and avoid the interference headaches. There is now a HUGE range
of spectrum available at 1 watt, the 5.3G and 5.4Ghz newly allocated
255Mhzspectrum usable as if this past January. Design mesh networks to
utilize these many channel options, avoid interference, and don't
destroy the industry by unnecessisarilly using the precious 5.8Ghz. In
a MESH design its rare to need to go distances longer than 2 miles, all
within the realm of possibility with low power 5.3G and 5.4G and Omnis
and relatively small panel antennas.
Likewise, reserve the precious 2.4Ghz for the link to consumer, the
spectrum supported by their laptops. I hope to see the industry smart
enough to use the new 5.4Ghz for MESH type systems, which is one of the
reasons it was allocated for.
One of the most important tasks for WISPs is to conserve the 5.8Ghz
spectrum and only use it when needed. It is in shortage most compared
to the other ranges. I had hoped and lobbied hard that half of the
5.4Ghz range would be allowed for higher power and PtP rules, but it had
not. Its still perfect for mesh and OFDM. Don;t be fooled into believing
high power is the secret weapon for mesh, as it is not, LOW power is.
Interference and noise is accumulative and travels for miles around
corners and obstructions, unlike good RSSI and quality signal. Get
better RSSI in MESH, by Reducing self interference and noise, by using a
wider range of channel selections and lower power. 5.3 and 5.4 gives
you 350Mhz to select channels from, of equal specification/propertied
RF. Design it into your MESH design. If you can't transport it in
1watt, redesign radio install locations and density. Every single
additional non-inteferring channel selection, drastically logrithmically
increases the odds of getting a non-interfering channel selection. 5.4G
is the best thinng that happened to MESH. Unfortuneately, worthless for
super cell design. But if MESH embrases 5.4 like it should, it leaves
5.8Ghz for Super cell. Otherwise the MESH designer is destined to fail,
because it will become a battle that the Super Cell guy won't be able to
give up on until his death, as he has no other option but the range he
is using. The mesh provider has options.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message ----- From: "Jack Unger" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Wednesday, February 22, 2006 6:29 PM
Subject: Re: [WISPA] Mesh Equipment
Unless you expect to handle only very low levels of traffic, avoid
mesh nodes with only one radio. Choose nodes that have one radio on
2.4 GHz for customer connections and one radio on 5.8 GHz for
backhauling. In other words, separate the "access" traffic from the
"backhaul" traffic. Your overall throughput capability will be many
times greater.
jack
ISPlists wrote:
Does anyone have a good recommendation on some Mesh equipment. I
have a small town that wants to provide Internet access to the entire
town and I'm thinking of using mesh technology. Any ideas would be
great.
Thanks,
Steve
--
Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc.
Serving the License-Free Wireless Industry Since 1993
Author of the WISP Handbook - "Deploying License-Free Wireless WANs"
True Vendor-Neutral WISP Consulting-Training-Troubleshooting
Phone (VoIP Over Broadband Wireless) 818-227-4220 www.ask-wi.com
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Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc.
Serving the License-Free Wireless Industry Since 1993
Author of the WISP Handbook - "Deploying License-Free Wireless WANs"
True Vendor-Neutral WISP Consulting-Training-Troubleshooting
Phone (VoIP Over Broadband Wireless) 818-227-4220 www.ask-wi.com
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