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On 3/27/2011 1:59 PM, Andrew Rich wrote:
<blockquote cite="mid:CA0B97583AF1497088D44FF164CC670E@MACBOOKPRO"
type="cite">Is it a genuine delay?
<br>
</blockquote>
<br>
YES<br>
<br>
<blockquote cite="mid:CA0B97583AF1497088D44FF164CC670E@MACBOOKPRO"
type="cite">
<br>
Are packets lost ?
<br>
</blockquote>
<br>
Apparently not. It acts as though some sort of buffer fills up, and
then the oldest packet gets pushed out when a new one arrives.
Depending on the volume of traffic on the channel, this FIFO buffer
effect can cause packets to delayed anywhere from 10s of seconds to
10s of minutes. <br>
<br>
<blockquote cite="mid:CA0B97583AF1497088D44FF164CC670E@MACBOOKPRO"
type="cite">
<br>
Is it a flow control issue ?
<br>
</blockquote>
<br>
It shouldn't be since KISS doesn't use flow control. <br>
<br>
A similar issue arose with a Kenwood D700's internal TNC being used
for an igate for a balloon launch in Colorado. In this case,
operating in NON-KISS mode with UIview with X-On/X-Off flow control
enabled, long delays were experienced. Setting the flow control in
UIview to "None" eliminated the problem. [ I suspect that random
bytes in binary telemetry steams (or corrupted incoming packets)
were being interpreted as X-On(11 hex or Ctrl-Q) ) and X-Off (13 hex
or Ctrl-S) control characters. This would cause the data flow from
the TNC to the PC to randomly stop and then later resume. ] <br>
<blockquote cite="mid:CA0B97583AF1497088D44FF164CC670E@MACBOOKPRO"
type="cite">
<br>
Does the test setup use no flow control ?
<br>
</blockquote>
<br>
Correct<br>
<br>
<hr size="2" width="100%"><br>
--<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
EchoLink Node: WA8LMF or 14400 [Think bottom of the 2M
band]<br>
Skype: WA8LMF<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.net">http://wa8lmf.net</a><br>
<br>
===== Vista & Win7 Install Issues for UI-View and Precision
Mapping =====<br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7">http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7</a><br>
<br>
*** HF APRS over PSK63 ***<br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/APRS_PSK63/index.htm">http://wa8lmf.net/APRS_PSK63/index.htm</a><br>
<br>
"APRS 101" Explanation of APRS Path Selection & Digipeating <br>
<a class="moz-txt-link-freetext" href="http://wa8lmf.net/DigiPaths">http://wa8lmf.net/DigiPaths</a> <br>
<br>
<br>
<br>
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