Before everybody jumps to this.
We have a network in the Netherlands and implemented a g backhaul + an a
backhaul solutions. We have set up 5 5ghz links now and really got
frustrated on this frequency. A with Tsunami and Lancom equipment. The
technology basically does not support the hype yet.
The G radio had a lower throughput than the Karlnet product with an Agere
(orinoco) B radio. It was exactly 1/5 off the throughput. That was on a 3 km
link with perfect radio connection. You also have to keep in mind that with
the ofdm, you can not use all 4 frequencies in the 2.4 ghz band.
The major reason is the lower receiver sensitivity off the current G cards
on the market (Advertized?? 54 Mbps: -66 dBm 802.11g 802.11b: 22 Mbps: -78
dBm
11 Mbps: -80 dBm.) A second problem is that the filtering off the receive
signal is bad so a lot off disturbance form GSM sites on the network and the
output signal is not stable as well causing channel seperation issues in the
network.
A good link that shows it for the different radio products on a b product
is: http://www.antennspecialisten.se/en/support/t1_spektrum.html
The a links are quite disappointing as well. We have disturbance from a
radar in the area. Same problem, any frequency in the area off the 5 ghz
overpowers the radio and disturbs the link. This is really a design problem
in the radio's. We are trying to build a filter in the antenna to improve
that. We know that the new radio's coming out in Q1 will have a much better
receiver sensitivity and better filtering providing a solution for that
problem.
We also found out that the radio's is transmitting over several channels
(similar to the bad b radio's) causing channel seperation issues.
Bottom line is that we found that the technology does not support the hype
yet.
We have two 5 ghz links working now with their troubles involved. It is not
possible to combine more from one point or tower due to the problems
described above. Despite all the nice sales materials from Tsunami or
others. So as long as you keep it to one link to two links from a tower
only, you are OK. You can not use the advertized higher number. Also the
throughput is limited, higher than the b though.
Wim Bos
-----Original Message-----
From: karlnet-bounces@WISPNotes.com
[mailto:karlnet-bounces@WISPNotes.com]On Behalf Of Michael McDermott
Sent: Thursday, December 11, 2003 2:54 AM
To: Brett Hays; Karlnet Mailing List
Subject: Re: [Karlnet] KN-50 and 802.11
What did you think about the Mikrotick g backhaul soultion?
At 08:39 PM 10/12/2003 -0500, you wrote:
>Amen to that!!
>
>----- Original Message -----
>From: <jna@tcpbbs.net>
>To: "Norm Young" <lists@applegatebroadband.net>; "Karlnet Mailing List"
><karlnet@WISPNotes.com>
>Sent: Wednesday, December 10, 2003 8:29 PM
>Subject: Re: [Karlnet] KN-50 and 802.11
>
>
> > Amen to that. I would really love to see a karlnet compatible radio
that's
> > boast more than a 5 mbs transfer capability. I have looked at
alternatives
> > like Mikrotick and such but really want to keep my all karlnet network
>just
> > that and the 802.11b is really not going to last long for a backhaul.
> >
> > John
> >
> >
> > > Also curious as to when we'll see some support for a and g standards?
>I
> > > could really use an upgrade in the backhaul, and I'd just as soon stay
> > with
> > > what I know.
> > >
> > > Norm
> > >
> > > ----- Original Message -----
> > > From: "Norm Young" <lists@applegatebroadband.net>
> > > To: "Karlnet Mailing List" <karlnet@wispnotes.com>
> > > Sent: Wednesday, December 10, 2003 12:38 PM
> > > Subject: Re: [Karlnet] KN-50 and 802.11
> > >
> > >
> > > > I have some v1.00-00-052215 KN-50's and I want to upgrade them to
> > > > v.1.00-00.073017. Anyone know how this is done?
> > > >
> > > > Norm
> > > >
> > > > ----- Original Message -----
> > > > From: "Marcelo Gimenez" <marcelo@aeronetworks.com.br>
> > > > To: "'Karlnet Mailing List'" <karlnet@WISPNotes.com>
> > > > Sent: Monday, December 08, 2003 1:10 PM
> > > > Subject: [Karlnet] KN-50 and 802.11
> > > >
> > > >
> > > > > Hi,
> > > > >
> > > > > Please, how can i configure KN-50 to works in 802.11 ( no
>Turbocell)?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Marcelo Gimenez
> > > > > AERO NETWORKS LTDA
> > > > > (+55 67) 326-9494 / 8111-8006
> > > > > http://www.aeronetworks.com.br
> > > > >
> > > > > _______________________________________________
> > > > > Karlnet mailing list
> > > > > Karlnet@WISPNotes.com
> > > > > http://lists.wispnotes.com/mailman/listinfo/karlnet
> > > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > Karlnet mailing list
> > > > Karlnet@WISPNotes.com
> > > > http://lists.wispnotes.com/mailman/listinfo/karlnet
> > > >
> > >
> > >
> > > _______________________________________________
> > > Karlnet mailing list
> > > Karlnet@WISPNotes.com
> > > http://lists.wispnotes.com/mailman/listinfo/karlnet
> > >
> >
> > _______________________________________________
> > Karlnet mailing list
> > Karlnet@WISPNotes.com
> > http://lists.wispnotes.com/mailman/listinfo/karlnet
> >
>
>_______________________________________________
>Karlnet mailing list
>Karlnet@WISPNotes.com
>http://lists.wispnotes.com/mailman/listinfo/karlnet
Michael R McDermott BEng (Comp. Eng.), MACS, IEEE
Pre-Sales Technical Consultant
Veritech Australia Pty Ltd
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