Re: [Madwifi-users] atheros link 6 milles ad-hoc

[Darrell B. <bu...@on...>]

Greg-

Any recommendations on what kind of values should be used for various=20
distances?

Oh, and for everyone else, I got the 7.5 mile figure out of stock dlink=20=

cards at 17 db tx power with 12 db antennas, if you add more power, you=20=

can obviously enhance that, but I figured it was a good working figure=20=

for what I was trying to do. YMMV, of course.

   -Darrell

On Apr 13, 2004, at 4:19 PM, Greg Chesson wrote:

> 11a with an external PA and antenna should be good for 20miles or more
> before multipath and delay spread start to confound the phy.
> Alvarion, for example, has demonstrated that kind of distance.
>
> Using off-the-shelf hw, the contention protocol will fail starting at=20=

> 1-1.5 miles
> unless you adjust upwards the timeslot value and ack/cts timeslot=20
> value.
>
> We put a hal API interface in the driver for just this purpose, but=20
> there is no code
> to do anything with it.   We'll have a sysctl hook in a near release=20=

> that would
> allow adjustments from the command line.  The plan is to make it
> "default value plus N microseconds" since most users won't know the=20
> default values.
>
> In the meantime the suggestions to set up one side as Master and the=20=

> other end as Managed
> are good suggestions.   Add in the time adjustments and a good antenna=20=

> and you should
> be good for a few miles.
>
> g
>
> Darrell Budic wrote:
>
>> Well, the research I've done says that you should be able to get=20
>> about 7.5 miles out of 802.11a, with decent antennas, at least, so=20
>> you're ok there. However, Shane Spencer has said that he has had=20
>> problems on long links with the current CVS, but has gotten 1.5 mile=20=

>> links to work.
>>
>> For a point to point link, you can always setup one end as master,=20
>> and one end as managed. Ad-hoc isn't yet stable enough for this,=20
>> although I've seen some patches on the dev list lately that may make=20=

>> a difference there.
>>
>> Hope this helps,
>>
>>   -Darrell
>>
>> On Apr 9, 2004, at 11:03 AM, Esteban (listas at dejawu dot com dot=20
>> ar) wrote:
>>
>>> Hi,
>>>
>>> Im just about to try atheros pci based card (5.2 Ghz) because 2.4=20
>>> Ghz is wide
>>> to dense in the place i live and does not propage well.
>>>
>>> Thats why i tought using 5.2 Ghz cards. The problem is that i think=20=

>>> the ad-hoc
>>> mode is not stable (as the README says) and that scares my a lot (my=20=

>>> budget is
>>> really low).
>>>
>>> The link is a point-point link of 6 milles. I thought using dlink=20
>>> ag520 cards.
>>> Any recomendation? help or hint would be realllly apreciate.
>>>
>>> Thnaks in advance,Esteban
>>>
>>>
>>>
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