Re: [Aironet] Performance decreased, why?

[sang2 <san...@ko...>]

Dear Bob Edwards,

Thak you for your help.
Your reply is right and I have tested and works well.
but a few questions are here.
1. If there is any other product in the same cell which uses near channel
that I selected,
    performance also decreased?
    If yes, please let me know how to solve it.
2. Is other product such as wavelan the same situation?
3. Which wireless card is the best one?

Best regards,
Sang

----- Original Message -----
From: "Bob Edwards" <Rob...@an...>
To: "sang2" <san...@ko...>
Cc: <ai...@en...>
Sent: Monday, February 19, 2001 7:21 AM
Subject: Re: [Aironet] Performance decreased, why?


> > sang2 wrote:
> >
> > Hi all,
> >
> > I have tested PCI342 adhoc mode with below configuration.
> >
> > * There are 4 PCs adhoc mode(same area in the office)
> > Network1 :  PC1  <------------> PC2
> >                   Ch:2                           Ch:2    (same channel
2, 3,
> > 4, 5 or any others excluded 6ch)
> >                   SSID: test1                 SSID: test1
> >
> > Network2 :  PC2  <------------> PC4
> >                   Ch:6                           Ch:6
> >                   SSID: test2                  SSID: test2
> >
> > * Problems
> > - One of network performance(throughput) decreased by half during the
other
> > network works
> >    such as file transfer or heavy traffic.
> >
> > Please let me know why it happens.
> >
> > Best regards,
> > Sang
>
> I'm going out on a bit of a limb here, but I recall reading that the
> channels need to be separated by 5 in order to not get any overlap in
> the spreading code. That is, channels 1, 6 and 11 don't overlap at all,
> 2 and 7 don't overlap etc. (if you have 13 channels, then 2, 7 and 12
> don't overlap, etc.). Remember that the spreading bandwidth is 22MHz,
> and the channels are separated by 5MHz. I'm assuming that you are trying
> 11Mbps - I think the effect of the overlap is less apparent at 2Mbps.
>
> Why don't you try your experiments with channels 1 and 6 and report back
> on the performance. These are the two channels I use and I get full b/w
> (11Mbps) on both links, but I have not tried any other combinations.
>
> Cheers,
>
> Bob Edwards.