[MLB-WIRELESS] OpenWRT long distance utility

[Ratbaggy]

Also see this page (about half way down)

http://forum.bsr-clan.de/ftopic6018-30.html

----- Original Message ----- 
From: "Brenton D." <ivile01 at yahoo.com.au>
To: "vak" <vak at alphalink.com.au>; "Ratbaggy" <wireless at smithsgully.net>
Cc: <secretary at melbournewireless.org.au>; <melbwireless at wireless.org.au>
Sent: Friday, March 03, 2006 9:51 AM
Subject: Re: [MLB-WIRELESS] OpenWRT long distance utility


> Hi,
> is it possible to get this for dd-wrt? or install it on a dd-wrt flashed
> wrt?
>
> ----- Original Message ----- 
> From: "vak" <vak at alphalink.com.au>
> To: "Ratbaggy" <wireless at smithsgully.net>
> Cc: <secretary at melbournewireless.org.au>; <melbwireless at wireless.org.au>
> Sent: Thursday, March 02, 2006 7:23 PM
> Subject: Re: [MLB-WIRELESS] OpenWRT long distance utility
>
>
> > That is an AWESOME improvement!!!
> >
> > Ratbaggy wrote:
> >
> >>Hi Dan and All,
> >>
> >>I am pleased to report that the utility works very well indeed.  I've
> >>experimented on our 14 km link between Blackburn North and Kangaroo
Ground
> >>(ILW to HKG) and the throughput (doing a http download) has gone from
> >>around
> >>60 KBytes/S to......
> >>
> >>Now wait for it..........
> >>
> >>Excuse me for getting a little excited........
> >>
> >>1130 KILOBYTES PER SECOND!!!!!!!!!!!!!!
> >>
> >>There are WRT54G Ver 2's running on each end with Freifunk version 1.1.4
> >>firmware.  Antennas are 24 dB Hills grid and 19 dB Panel.
> >>
> >>This link doesn't have a great path and the line of sight skims across
the
> >>roofs at the Blackburn end and the signal strength as reported on the
> >>crappy
> >>WRT radios is -77 dBm with noise at -94.
> >>
> >>My recommendation with setting the "distance" for dctrl is to start at
> >>double the distance and reduce the number to the point where throughput
> >>reaches a maximum.  Shortly beyond this point the throughput will drop
> >>drastically.  In our case with the 14 k link the optimum speed was
> >>achieved
> >>with the parameter set to about 21000 but we backed it off to 22000.  I
> >>suspect the programmer may not have made allowance for the round trip
> >>delay.
> >>
> >>Due to the poor signal to noise ratio on our link optimum performance
was
> >>achieved with the radios locked to 18 Megabits per second, any faster or
> >>slower and the performance dropped off.  With another 10 dB of signal to
> >>noise I suspect some further gains may be possible although at this
point
> >>the router may run out of steam before the radios.
> >>
> >>The settings that were used:
> >>
> >>WLAN Mode: Ad Hoc
> >>Radio Mode: G Mode Performance (whatever that means)
> >>Transmission Rate: 18 MBits/S
> >>CTS Protection: Disabled
> >>Frame Burst: Enabled
> >>/usr/sbin/dctrl 22000
> >>
> >>For other links with different S/N and distances Transmission Rate and
> >>dctrl
> >>will need to be optimised.  Hopefully some others can do some more
> >>experimenting on different links.
> >>
> >>Dave.
> >>
> >>----- Original Message ----- 
> >>From: "Dan Flett" <conhoolio at hotmail.com>
> >>To: <melbwireless at wireless.org.au>
> >>Sent: Monday, February 20, 2006 8:24 PM
> >>Subject: [MLB-WIRELESS] OpenWRT long distance utility
> >>
> >>
> >>
> >>>Hi all,
> >>>
> >>>I've found a few links regarding a utility for OpenWRT/broadloom-based
> >>>routers.
> >>>
> >>>The utility is called dctrl and it works quite simply - you just put in
> >>>
> >>the
> >>
> >>>distance of the link as a parameter and it tweaks the broadcom radio
> >>>
> >>timing
> >>
> >>>settings to be optimal for that distance.
> >>>
> >>>You can get it here:
> >>>http://openwrt.inf.fh-brs.de/~nbd/dctrl.
> >>>
> >>>Further discussion of link tests here:
> >>>http://forum.bsr-clan.de/viewtopic.php?p=10530.
> >>>http://forum.openwrt.org/viewtopic.php?id=4447
> >>>http://forum.openwrt.org/viewtopic.php?pid=21034
> >>>
> >>>I'd be keen to hear if people with WRT-based long-distance links have
any
> >>>success with this.
> >>>
> >>>Regards,
> >>>
> >>>Dan Flett
> >>>Secretary
> >>>Melbourne Wireless
> >>>_______________________________________________
> >>>Melbwireless mailing list
> >>>Melbwireless at wireless.org.au
> >>>http://wireless.org.au/mailman/listinfo/melbwireless
> >>>
> >>>
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> >>>
> >>17/02/2006
> >>
> >>>
> >>
> >>_______________________________________________
> >>Melbwireless mailing list
> >>Melbwireless at wireless.org.au
> >>http://wireless.org.au/mailman/listinfo/melbwireless
> >>
> >>.
> >>
> >>
> > _______________________________________________
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> > http://wireless.org.au/mailman/listinfo/melbwireless
>
>
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