Brian,
I did notice there are two scott's on this thread... the other scott came
in as a me too post... Scott, its ok.. names caused confusion.
You can call me Vector from now on ;).
Yeah, on the antenna side, airbridge pointed this out, and stated even
the ABTotal's 17 dbi antenna may have this issue. But man, it would be
certainly different then any other device on our network...
We do have trees in the fresnal zone, but upload vs download... hmm....
We had one other customer on another tower experiencing these same
issues... what fixed them was changing the MTU.. But that was easy since
there was a router on top of them ... Like I said, I hate modifying
registries..!
We will be trying the power reduction next time we are out there.
As far as lifting the RTS from surrounding devices.. Well, we
implemented AP wide RTS because of this client.. before we had no RTS
control... Don't have the detailed data but lets say that uploads were
still a serious issue.
Lastly, as far as other AP's on that channel using RTS... well the only
other tower around on that channel is ours, and none of those clients
have RTS turned on, plus the device can't here it according to the "Find
AP" selection on the AP...
If all else fails, we are putting up another radio (probably a demarc or
another Cisco) to see if they replicate the issue... If they do not
think sB will have some explaining ;)
Scott
-----Original Message-----
From: "Brian Winter" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Date: Wed, 26 Nov 2003 20:45:50 -0000
Subject: Re: [smartBridges] upload vs download
> ok. .... and so no other potential clients (yours or anyone elses)
> _attempting_ to negotiate an association with your AP (and so missing
> your
> packets) or another AP on the same channel far away ?
>
> I've just read that rts stops transmissions from all nodes on the same
> physical channel even if they're on a different network - makes sense I
> guess. I was wondering if there could be a distant high power AP on
> same
> channel invoking rts which is telling your ABO to shut up on occasions.
> That would be difficult to find as you might not be able to see it
> easily
> (poss displayed in "Select from Available Access Points" on Site Survey
> tab?
> netstumbler ?). How you stop it if that is the case I wouldn't know -
> directional narrow beam aerials I guess - but you've already got that.
> Tricky.
>
> Maybe its not a case of lowering the o/p power (was it you trying
> that?) but
> reducing antenna gain to lose unwanted cts on rx side ? This is
> getting
> heavy !!! must be simpler than this ......
>
> clutching at straws....
>
> Just looking back (are there 2 Scotts on this thread ?) I think I might
> be
> confusing two different systems/problems. On the first I see "Network
> has
> RTS on all other devices pointed at that AP at 128" - Strikes me this
> might be the issue there - I wonder how the "bad" client behaves if
> rts is
> lifted from its other neighbours ?
>
>
> ----- Original Message -----
> From: "Scott" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, November 26, 2003 7:13 PM
> Subject: Re: [smartBridges] upload vs download
>
>
> > No, this is different. This is point to point, both ends with
> directional
> > antennas and only one ABO connecting to APP.
> >
> > Scott
> >
> >
> > > Scott,
> > > Isn't this exactly what we are talking about on the other thread ?
> > >
> > > For this discussion AP = Access Point rather than APO etc
> > >
> > > AP > client
> > > Your client does not hear many other client transmissions cos its
> got
> > > directional antenna pointing towards AP, or not many clients nearby
> etc.
> > So
> > > when AP transmits, it can hear it no probs, no retries. Good
> bandwidth
> > >
> > > Client > AP
> > > AP hears all the clients - thats its job. When your client
> transmits it
> > > doesn't know that others are also transmitting to it ("hidden
> nodes" as
> > far
> > > as your client is concerned), the AP does not ACK. the packet is
> retried.
> > > Poor bandwidth due to retries.
> > >
> > > Suggest you check retied packet stats at the client. Does reducing
> the
> > > value of RTS help ? Say to 200 ? Need to find the balance possibly
> > >
> > >
> > > ----- Original Message -----
> > > From: "Scott" <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Sent: Wednesday, November 26, 2003 5:22 PM
> > > Subject: Re: [smartBridges] upload vs download
> > >
> > >
> > > > I really hate "me too" emails but we've experienced the exact
> same
> > > > behaviour. I'm wondering how many people have witnessed this
> happening.
> > > > This is an ABO to AP link and SimpleNMS shows the following:
> > > >
> > > > The AP client table shows RSSI 92% -17dbm and a link
> quality of
> > 90%
> > > > The ABO statistics show RSSI 60% -42dbm and link quality 72%
> > > >
> > > > If I understand this properly you would _think_ that you would
> get
> > higher
> > > > bandwidth from the ABO to the AP (am I right here theoretically
> ?) but
> > > this
> > > > is exactly the opposite.
> > > >
> > > > This is a 14 mile link which is very stable. From the ABO,
> download
> is
> > > over
> > > > 1Mbps but upload is probably 250kbps.
> > > >
> > > > Running 1.4j.6 and 0.01.08
> > > >
> > > > Scott
> > > >
> > > >
> > > > > I have seen this also in some cases so you are not alone.
> Anyone
> with
> > a
> > > > > clue as to what is happening here?
> > > > >
> > > > > -----Original Message-----
> > > > > From: [EMAIL PROTECTED]
> > > > > [mailto:[EMAIL PROTECTED] Behalf Of shoffman
> > > > > Sent: Tuesday, November 25, 2003 6:43 PM
> > > > > To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> > > > > Subject: [smartBridges] upload vs download
> > > > >
> > > > >
> > > > > Hi all,
> > > > >
> > > > > Know this has been discussed several times.. hate to repeat an
> old
> > > topic.
> > > > >
> > > > > Here is scenario:
> > > > >
> > > > > Customer has ABTotal. RSSI 75%, Link quality 95% on its
> reading.
> > Long
> > > > > Preamble, 5 MBps auto (also tried at 11 Mbps auto).
> > > > >
> > > > > Frag set at two different levels: 512 and 2336 (off)
> > > > > RTS set at two different levels (4combos in all): 128 and 2337
> (off)
> > > > >
> > > > > Ethernet card at 10 - 1/2 duplex
> > > > >
> > > > > AP is Cisco 350 - RTS Off, Frag 2336. Signal Strength at 50%.
> > > > >
> > > > > In all cases: Download 600-800 kbps, upload (best with RTS off)
> 36
> > kbps,
> > > > > with RTS 8 kbps.
> > > > >
> > > > > Network has RTS on all other devices pointed at that AP at 128.
> > > > >
> > > > > So... thoughts? We are going to re-terminate...go with an
> outdoor
> and
> > > > > parabolic.. But is this interfernce? SB device see no other
> signal,
> > > > > have not sent out an SA yet. All other clients are doing
> pretty
> good
> > on
> > > > > this network. We will send an SA out to be sure, but
> still.....
> > > > >
> > > > >
> > > > > Thoughts
> > > > >
> > > > > Scott
>
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