[Olsr-users] Using multiple radio cards
Victor
(spam-protected)
Fri Aug 8 12:21:13 CEST 2008
Hi Derek,
Just note that when using multiple radio cards you will still need physical
separation (antenna) separation between the radio cards otherwise they will
still be interfering with each other no matter what channel you set them to.
Mixing a and g band radios is okay and you wont need the physical separation
because the frequencies are far enough apart. When I was working on this for
an honours thesis I found that I needed a minimum of 1 meter separation
between the antennas otherwise you get worse performance than just a single
card.
Victor
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Today's Topics:
1. Yippie - routing now working (due to LinkQualityLevel
setting) (Derek C)
2. Using multiple radio cards (Derek C)
3. Re: Using multiple radio cards (Benjamin Henrion)
4. Re: Using multiple radio cards (Derek C)
5. Re: Using multiple radio cards (aaron)
6. Re: Using multiple radio cards (Derek C)
----------------------------------------------------------------------
Message: 1
Date: Thu, 7 Aug 2008 17:12:02 +0100 (IST)
From: "Derek C" <(spam-protected)>
Subject: [Olsr-users] Yippie - routing now working (due to
LinkQualityLevel setting)
To: (spam-protected)
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NOTE: SORRY - somehow I posted my message to the olsr dev mailing list
rather than the users one (and I'm not on the dev mailing list either).
Hi again,
To let you know - quite blindly I started modifying olsrd.conf settings to
see if the routing would start working - and it paid off.
I switched "UseHysteresis" to "no" and then I changed "LinkQualityLevel"
from "0" (default) to "1" - after this, and a olsrd restart of course,
routing came up!
Actually I had avoided the LinkQualityLevel setting because I thought it
really was "Hysteresis" OR "LinkQualityLevel" and Hysteresis sounded like
a better system to opt for...
thanks,
Derek
--
--
Derek C
In Ireland
------------------------------
Message: 2
Date: Thu, 7 Aug 2008 17:40:15 +0100 (IST)
From: "Derek C" <(spam-protected)>
Subject: [Olsr-users] Using multiple radio cards
To: (spam-protected)
Message-ID:
<(spam-protected)>
Content-Type: text/plain;charset=iso-8859-1
Hi again,
On multiple radio cards: I'm new to AdHoc networking but I know that
AdHoc networks don't hunt for APs over different frequencies like the
typical AP->STA type setup.
I was hoping to have a dual [backbone] radio setup with one omni antenna
and one directional antenna per node to try to allow for links with
increased range over omni -> omni arrangements.
It does seem counter-productive to me to use the same frequency for two
individual radio cards - surely the interference would cause major
slow-downs in communications? (even more so than in a repeating single
radio card setup due to re-transmissions?). Funny though because I think
I've read over people's setup with two radio cards set to the same
frequency.
Does anyone have any experience or opinions on dual radio setups?
thanks,
Derek
--
--
Derek C
In Ireland
------------------------------
Message: 3
Date: Thu, 7 Aug 2008 18:57:43 +0200
From: "Benjamin Henrion" <(spam-protected)>
Subject: Re: [Olsr-users] Using multiple radio cards
To: "Derek C" <(spam-protected)>
Cc: (spam-protected)
Message-ID:
<(spam-protected)>
Content-Type: text/plain; charset=ISO-8859-1
On Thu, Aug 7, 2008 at 6:40 PM, Derek C <(spam-protected)> wrote:
> Hi again,
>
> On multiple radio cards: I'm new to AdHoc networking but I know that
> AdHoc networks don't hunt for APs over different frequencies like the
> typical AP->STA type setup.
>
> I was hoping to have a dual [backbone] radio setup with one omni antenna
> and one directional antenna per node to try to allow for links with
> increased range over omni -> omni arrangements.
>
> It does seem counter-productive to me to use the same frequency for two
> individual radio cards - surely the interference would cause major
> slow-downs in communications? (even more so than in a repeating single
> radio card setup due to re-transmissions?). Funny though because I think
> I've read over people's setup with two radio cards set to the same
> frequency.
>
> Does anyone have any experience or opinions on dual radio setups?
I should publish soon my findings about multiple radio.
Basically the more seperation in frequencies the better.
If you want to use 2 different channels in the 2.4 band, try to use
ch1 and ch13 or example, or at least non-overlapping channels (ex:
1-6-11).
If you are using omnis, try also to have Hpol and Vpol for better
seperation.
In the 5gh band, use 5.2 and 5.8 in order to maximise the seperation.
--
Benjamin Henrion <bhenrion at ffii.org>
FFII Brussels - +32-484-566109 - +32-2-4148403
------------------------------
Message: 4
Date: Thu, 7 Aug 2008 18:55:45 +0100 (IST)
From: "Derek C" <(spam-protected)>
Subject: Re: [Olsr-users] Using multiple radio cards
To: "Benjamin Henrion" <(spam-protected)>
Cc: (spam-protected)
Message-ID:
<(spam-protected)>
Content-Type: text/plain;charset=iso-8859-1
Hi Benjamin,
I'm going to be using 802.11a 5Ghz (one planer & one omni). I have a
separate 2.4 Ghz card & omni for bandwidth supply to customer notebooks
(so three cards total per node).
The problem with any separate frequencies at all is that, as far as I can
see, it hobbles adhoc mesh networking altogether in that one node won't
see any neighbors that are not on its assigned frequency.
How did you approach this with multiple radio cards and frequencies?
thanks for any information
Derek
On Thu, August 7, 2008 5:57 pm, Benjamin Henrion wrote:
> On Thu, Aug 7, 2008 at 6:40 PM, Derek C <(spam-protected)> wrote:
>
>> Hi again,
>>
>>
>> On multiple radio cards: I'm new to AdHoc networking but I know that
>> AdHoc networks don't hunt for APs over different frequencies like the
>> typical AP->STA type setup.
>>
>> I was hoping to have a dual [backbone] radio setup with one omni
>> antenna and one directional antenna per node to try to allow for links
>> with increased range over omni -> omni arrangements.
>>
>> It does seem counter-productive to me to use the same frequency for two
>> individual radio cards - surely the interference would cause major
>> slow-downs in communications? (even more so than in a repeating single
>> radio card setup due to re-transmissions?). Funny though because I
>> think I've read over people's setup with two radio cards set to the same
>> frequency.
>>
>> Does anyone have any experience or opinions on dual radio setups?
>>
>
> I should publish soon my findings about multiple radio.
>
>
> Basically the more seperation in frequencies the better.
>
>
> If you want to use 2 different channels in the 2.4 band, try to use
> ch1 and ch13 or example, or at least non-overlapping channels (ex:
1-6-11).
>
>
> If you are using omnis, try also to have Hpol and Vpol for better
> seperation.
>
> In the 5gh band, use 5.2 and 5.8 in order to maximise the seperation.
>
>
> --
> Benjamin Henrion <bhenrion at ffii.org>
> FFII Brussels - +32-484-566109 - +32-2-4148403
>
>
--
--
Derek C
In Ireland
------------------------------
Message: 5
Date: Thu, 07 Aug 2008 20:36:24 +0200
From: aaron <(spam-protected)>
Subject: Re: [Olsr-users] Using multiple radio cards
To: Derek C <(spam-protected)>
Cc: (spam-protected)
Message-ID: <(spam-protected)>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> How did you approach this with multiple radio cards and frequencies?
>
I would just use multiple cards / radios in that case.
a.
------------------------------
Message: 6
Date: Thu, 7 Aug 2008 20:42:16 +0100 (IST)
From: "Derek C" <(spam-protected)>
Subject: Re: [Olsr-users] Using multiple radio cards
To: "aaron" <(spam-protected)>
Cc: (spam-protected)
Message-ID:
<(spam-protected)>
Content-Type: text/plain;charset=iso-8859-1
Hi again Aaaron,
On single radio [backbone] mesh systems - part of the advantage to the
adhoc / olsrd network is that the nodes "see" all nearby neighboring nodes
so can route via them as necessary. This must be necessary (important
anyway) for routing via new (better signal / less hops) nodes as they
appear and for resilient links.
If two radio cards are used and two channels are used then nodes would
have to be programmed with the channel to use (per radio card, etc) as
they are going out for installation but without any automated channel
selection it would be just like having separate olsrd networks wouldn't
it?
Before dabbling olsr I was trying out my own perl based scripts to find
neighbors - I was using AP and STA cards (not adhoc networking) but this
was flawed because I couldn't work out safe routes to gateway nodes (only
routes to nearby strong signal neighbors) but in a way it was good because
I always had unique frequencies.
If you are using separate radio cards and separate channels would you just
manually structure your "hybrid" network or is there any other intelligent
options?
thanks for any information
Derek
On Thu, August 7, 2008 7:36 pm, aaron wrote:
>
>> How did you approach this with multiple radio cards and frequencies?
>>
>>
>
> I would just use multiple cards / radios in that case.
>
>
> a.
>
>
--
--
Derek C
In Ireland
------------------------------
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