[CUWiN-Dev] question about HSLS

[David Young]

On Tue, Mar 17, 2009 at 05:25:40PM +0900, ??? wrote:
> Thanks to your advice, I've got etx values like below. But a strange thing
> is that the values are sometimes much larger than the average, for example
> 554 or 1369.
> Actually I put two nodes closely (about 1 meter distant) using a clear
> channel of 11a, and ran HSLS only these two nodes. And I assumed that real
> etx values are calculated by dividing the etx values obtained by 256 as
> following two links suggest. (actually they are slightly different in
> calculation)

Divide the ETX figures by 256 to get the real value.

There may still be packet loss at 1 meter, however, an ETX of
470 does seem rather high.

I suggest collecting a trace of all HSLS packets on both nodes with
TCPDump, and see if all packets transmitted by one node are actually
received by the other.

There may be a bug in ETX.

Dave

-- 
David Young             OJC Technologies
dyoung at ojctech.com      Urbana, IL * (217) 278-3933