No, it's time to start looking at Proxim's WORP, or some other vendor
entirely. I'm considering adding WORP to the mix, starting with our
backhaul. Proxim's MP.11a product is getting a close look. I would love
to stay with Karlnet, and try their .a or .g products but this problem has
the potential to ruin my business. And the inablity/lack of desire to
address this problem from Karlnet is absolutely mind boggling, not to
mention profoundly disturbing. (And I depend on these people?)
I understand that we may be seeing more competition from sat in the near
future; my competitive advantage is not bandwidth, but latency. And a
significant number of my customers are using VOIP; an application that
definitely doesn't work well with lots of jitter; and that's what I'm
delivering.
Got to just love the deafening silence of Karlnet on this subject....
That's right boys, just wait it out, don't address it, and it'll go
away--along with a good percentage of your business!!!
So, it seems to me that I didn't see the problem when I had some of the
early 4.X firmware running. So I guess I'll try going back to earlier
firmware versions.
Norm
----- Original Message -----
From: "Bob Hrbek" <bhrbek@jagwireless.net>
To: "Timothy J Steele MCSE" <tsteele@e-isco.com>; "Karlnet Mailing List"
<karlnet@WISPNotes.com>
Sent: Wednesday, September 10, 2003 8:59 PM
Subject: Re: [Karlnet] RE: Ping Jitter
> I have seen the same. So...I'm totally screwed.
>
> I'm not going to change out 30 subs antenna or overamp the sector to get
the
> "greater than 15db" SNR.
>
> Turn off polling and what's the big advantage to Karlnet?
>
> This sucks. I guess it's time to deploy an 802.11b AP and start doing the
> new installs that way.
>
> -bob
> ----- Original Message -----
> From: "Timothy J Steele MCSE" <tsteele@e-isco.com>
> To: <karlnet@WISPNotes.com>
> Sent: Wednesday, September 10, 2003 10:45 PM
> Subject: [Karlnet] RE: Ping Jitter
>
>
> > We have the same exact problem on ALL our mountain sites. We currently
> have
> > five mountain sites with 40+ subscribers each. All are running Karl Net
> > flash ROM units with at least 1 GHz CPUs and 256mb of system RAM. We
have
> > been running with 40+ clients on at least two of the sites for over
three
> > years with no "ping jitter" whatsoever. All of our sites are monitored
and
> > logged via SMTP. The "ping jitter" problem appeared on our sites once we
> > moved from the 3.x version (3.88) to the 4.x (4.43) version. Once we
> noticed
> > this we began a small lab test to narrow down where the problem resides.
> > What we found was polling was the cause. Whenever we would disable the
> > polling functionality of the base unit the ping times would return to
the
> > normal 10ms to 30ms range. Once we enabled pooling the ping times would
> > change dramatically from 10ms to over 400ms. Poling by itself would
> increase
> > the latency, then when we created some weak SNR signals to our test lab
> the
> > latency would increase dramatically. It seems that the pooling of the
base
> > station is effected by the SNR of each subscriber. Once you get several
> weak
> > subscribers (15db and under) the latency seems to increase
exponentially.
> > This problem does not occur when we flash our lab unit with the older
3.88
> > version. The latency remains consistent between 10 and 40 ms. it is
> affected
> > by poor SNR bur not as dramatically as the 4.x versions. It would seem
to
> > eliminate the "ping jitter" you have two choices, one "turn of poling"
> this
> > fixes the problem immediately but then you loose the ability to support
> the
> > NDIS version of the Karl Net client software (this includes the new
Ubicom
> > units since they are a variant of the NDIS client). Or downgrade to the
> 3.x
> > version and loose a whole bunch of new base software features. At this
> time
> > we are doing everything we can to maximize SNR on all our subscribers to
> at
> > least reduce the latency and wait for Karl Net to address the issue in a
> > future BIN release.
> >
> > Timothy Steele
> > e-ISCO Internet
> > MCSE, MCP, MCI
> > tsteele@e-isco.com
> > www.e-isco.com
> >
> >
> > _______________________________________________
> > Karlnet mailing list
> > Karlnet@WISPNotes.com
> > http://lists.wispnotes.com/mailman/listinfo/karlnet
> >
>
> _______________________________________________
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