Karlnet
[Top] [All Lists]

RE: [Karlnet] Strange retransmit problem

To: <karlnet@WISPNotes.com>
Subject: RE: [Karlnet] Strange retransmit problem
From: Chris Conn <cconn@abacom.com>
Reply-to: karlnet@WISPNotes.com
Date: Sun, 15 Dec 2002 16:12:04 -0500 (EST)
List-post: <mailto:karlnet@WISPNotes.com>
On Sun, 15 Dec 2002, Kevin Knuth wrote:

> The TurboCell algorithm is pretty complex, so I am not sure of the "delay or
> timeout" before it moves on.
>
> However, you must realize the forcing TurboCell to "not wait" has an effect
> too!  I just wonder if the benefit outweighs the other possible effects on
> performance.  A question that WISPs have to ask themselves is how many links
> do they have that have less then great signal?  Most WISPs run with very
> marginal links. If we tell TurboCell to ignore those, they may as well close
> up shop!

Hello,

As I said, this problem only occurs for a few minutes, where a single
satellite is hogging all resources.  No other satellites get polled.  I
don't believe that this "fix" would necessarily have to take into account
a constant situation but rather a particular case where the satellite is
obviously not sending something back to the base and it gets stuck.  I
don't see how it can be considered normal that a satellite can cause an
entire multipoint setup to become unuseable for a number of minutes.

As for marginal, during one of these "problems", I had 20db+ SNR on either
the base or the satellite, therefore I doubt it is a noise issue.  And the
satellites in question have less than 2% retransmits at any given time
other than these particular incidents where we have several thousand % of
retransmit.

Chris



<Prev in Thread] Current Thread [Next in Thread>