[MLB-WIRELESS] DLink 900+ speed problems in bridge mode (and link up!)

[vak]

Good stuff. Congrats on getting your link up.

Your problem with 5.5 Megabits at 2.5km is explainable (sitting next to each
other is not so easy to explain).

At 2.5mk, you probably don't have a high enough signal to noise ratio to allow
the units to work at the higher speeds.

In short, the signal to noise ratio is low enough that the modulation techniques

at 11 and 22mbps don't function properly (they may allow a few spurious packets
to get through).

You are better fixinging the speed to 5.5mbps (instead of auto) so that the
DLink won't try and renegotiate the higher speeds.

Vaskos
-------

David Ng wrote:

> Me, my twin brother nuge (allan) and a mate (pascal/bugger) finally got our
> wireless network going!
>
> The link is across 2.5Km of air between me+nuges (we're twins remember!)
> house and pascals house.
> Its only in testing mode at the moment, we got some stuff we need to iron
> out.
>
> Cost of parts required:
> DLink DWL-900AP+ 802.11b Wireless Access Point $265 (CPL)
> 18.8dBi Hills 2.4GHz Parabolic Grid Antenna $110 (thanks simon @
> melbwireless)
> 5m LMR-400 cable $free (from my mate marty, thanks man!)
> N-connector $4.50 (dick smith)
> RP-SMA to N pigtail $37 (kudos vak @ melbwireless)
>
> So thats a total of $416.50 each side.
> The 2 APs are running in bridge mode, with 64-bit WEP enabled.
>
> small page here (with pictures):
> wifi.nudgeee.net
>
> The problem is, we initially tested the DLink DWL-900AP+ AP's (fw v2.5) with
> them sitting about 5 meters apart (with thier inbuilt antennas), and the max
> they could talk to each other was at 5.5mbit. We tried changing modes (AP,
> client, bridge), disabling WEP, changing channels, etc, but they don't seem
> to connect at 22, let alone 11mbit. We connected them to our antennas
> anyway, but they still only connect at 5.5mbits. We have clear LoS and a
> pretty good fresnel zone. Its at 5.5mbits rock solid, but as soon as we
> switch up to 22, theres alot of packet loss and dropouts (seems like theyre
> having troubles negotiating at 11 and 22 and are dropping back to 5.5).
>
> We put the link up regardless becuse we wanted to get it up and running, and
> we've dragged it out pretty long already (and besides, uni's started!).
>
> I've posted this issue on a forum, and it was mentioned that someone on
> melbourne wireless had come across the 5.5mbit/s problem before.  Can anyone
> explain?
>
> Thanks,
> David Ng (nudge).
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