Maximum of how many wireless cards

Jim Thompson jim at netgate.com
Mon Jul 12 05:48:12 EDT 2004


On Jul 12, 2004, at 1:37 AM, Denis Vlasenko wrote:

> On Monday 12 July 2004 11:17, Jim Thompson wrote:
>> On Jul 10, 2004, at 1:39 PM, Denis Vlasenko wrote:
>>> On Saturday 10 July 2004 08:59, nondito wrote:
>>>> Hi,
>>>>
>>>> Maximum of how many wireless cards I can use in a
>>>> hostap box?
>>>>
>>>> I have 6 PCI slots, can the driver support loading
>>>> upto 6 wireless cards?
>>>
>>> I used 3 cards at once. No apparent problems.
>>
>> Did you try it at range?
>
> Yes. Two cards in one box, each serving at least ~5 km
> long link.

And, if you turn off one of the cards, does the link throughput (at 
range) improve?

802.11's retry can mask some level of failure.

>
>>> Channels 1 and 5 would interfere. Only 1 and 6 wouldn't.
>>> In other words, you need at least 4 channels in between.
>>> Basically, you can use 1,6,11 and 16th channel. ;)
>>
>> The whole "three non-overlapping channels" thing is a myth.  See
>> previous message.
>>
>>> No, I don't know how to set 16th channel.
>>
>> There is no 16th channel.  Its unlikely that the VCOs on your card 
>> will
>> tune the radio that high anyway.
>
> Atheros is rumored to be able to go way higher (and to be able to go
> lower than 1st ch) than that.

The 'rumor' is true.  I can't say 'how far' (NDAs).  This is (one of 
the reasons) why madwifi has a HAL.

But Prism2/2.5/3 is not Atheros.

jim




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