Chris,
Who have you been dealing with in our office?
Kevin
____________________________________
Kevin R. Knuth
Business Development Manager
North America
Corporate Office: 614-822-5275 x130
Home Office: 260-424-9690
Cell Phone: 260-402-6086
Email: kknuth@karlnet.com
www.karlnet.com
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-----Original Message-----
From: karlnet-admin@WISPNotes.com [mailto:karlnet-admin@WISPNotes.com]On
Behalf Of Chris Conn
Sent: Wednesday, December 11, 2002 5:37 PM
To: karlnet@WISPNotes.com
Subject: [Karlnet] Strange retransmit problem
Hello to all,
I have been having a strange problem for quite a while. I have spoken
to Karlnet about this and they told me it was a rare occurrence and
_maybe_ one other customer was seeing this but all data was inconclusive.
The problem:
A situation can arise intermittently (once a week, once a month, three
times a day, no real pattern) where in a multi-point antenna, the base
station will enter a mode where it is retransmitting thousands and
thousands of packets to a satellite. The transmit counter does not
increase, only the re-transmit counter, and by the thousands at a time.
Upon looking at the Turbocell station entries, we notice that the
transmit and retransmit counters seem to have reset back to zero for the
satellite to which it is retransmitting, and you can watch the
re-transmit counters increase at an alarming rate. All other satellites
are still visible, however no TCP/IP data can pass to any satellite,
including the one to which the retransmits are occurring. Therefore,
the whole system is no longer useable. The amount of throughput before
or after can be high or low, it does not matter. This will happen day
or night, with or without customer usage. After a few minutes (2 to 5),
the whole thing comes back online and data starts to pass again. It
would seem that the base station jams on one satellite which no longer
can acknowledge a transmission for some reason.
We have tried changing all hardware, using flashroms, AP1000s, new
antennas. In no case are we using amplification of any kind. We also
tried replacing the radio card in the base to a PRISM 2.5 200mW, and
were initially happy however the problem eventually happened therefore
it is not a radio firmware issue (since it is not Orinocco specific),
and looks to be a software issue.
The Workaround:
We have found that setting the base from 11Mbps to 5.5Mbps will fix the
problem in 3 out of the 4 setups that are doing this. However, in one
case we had to set a customer satellite all the way down to 1Mb in order
to cease totally any form of this problem. But, we obviously take a
performance drop in the process.
Other info:
All bases are running 4.31, and the clients are running a mix of 3.88
and 4.02. I assume however that it has to do with the base since it is
my understanding that polling should occur many times per second to each
satellite and during these periods, several minutes go by before any
satellite is polled other than the one the base seems to get stuck on.
Any ideas?
Thanks,
Chris
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