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Thanks, Matthew. Sounds like the manufacturers of our VoIP
equipment need to use the AMBE voice chip. :)<br>
<br>
73,<br>
Joel - W4JBB<br>
<br>
<div class="moz-cite-prefix">On 9/20/13 5:47 PM, Matthew Pitts
wrote:<br>
</div>
<blockquote
cite="mid:1379717263.20616.YahooMailNeo@web141003.mail.bf1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:12pt">Joel,<br>
<br>
Conventional VoIP probably doesn't, but D-Star and other similar
systems don't follow those rules; the FEC is actually handled by
the AMBE Vocoder chips through firmware programming.<br>
<br>
Matthew Pitts<br>
N8OHU<br>
<div><span><br>
</span></div>
<div><br>
</div>
<div style="font-family: times new roman, new york, times,
serif; font-size: 12pt;">
<div style="font-family: times new roman, new york, times,
serif; font-size: 12pt;">
<div dir="ltr">
<hr size="1"> <font face="Arial" size="2"> <b><span
style="font-weight:bold;">From:</span></b> Joel
Black <a class="moz-txt-link-rfc2396E" href="mailto:w4jbb@charter.net"><w4jbb@charter.net></a><br>
<b><span style="font-weight: bold;">To:</span></b>
Discussion of D-RATS
<a class="moz-txt-link-rfc2396E" href="mailto:drats_users@intrepid.danplanet.com"><drats_users@intrepid.danplanet.com></a> <br>
<b><span style="font-weight: bold;">Sent:</span></b>
Friday, September 20, 2013 6:23 PM<br>
<b><span style="font-weight: bold;">Subject:</span></b>
Re: [drats_users] ERROR Correction in slow speed data<br>
</font> </div>
<div class="y_msg_container"><br>
<div id="yiv5858165617">
<div> Okay, this goes against what little I have learned
about VoIP traffic.<br>
<br>
I didn't think there was any FEC with voice. That's
why voice has priority on data networks that use
VoIP. Otherwise, if a data packet has priority, it
would bump a voice packet. When a voice packet is
bumped, you lose bits of it resulting in choppy audio.<br>
<br>
I have experienced this when some of our first quasi
VoIP locations came online. Voice is live traffic.
Once it is said, it goes. There's nothing to
re-transmit.<br>
<br>
Without getting into the engineering (which will leave
me drooling and nodding off to sleep), how does D-STAR
use FEC on voice?<br>
<br>
73,<br>
Joel - W4JBB<br>
<br>
<div class="yiv5858165617moz-cite-prefix">On 9/20/13
3:57 PM, John Davis wrote:<br>
</div>
<blockquote type="cite">
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<div class="yiv5858165617WordSection1">
<div class="yiv5858165617MsoNormal"><span
style="font-size:11.0pt;color:#1F497D;">That
is true. The FEC is on the voice with 2400
bits for voice and 1200 for FEC.</span></div>
<div class="yiv5858165617MsoNormal"><span
style="font-size:11.0pt;color:#1F497D;"> </span></div>
<div class="yiv5858165617MsoNormal"><span
style="font-size:11.0pt;color:#1F497D;">John
WB4QDX</span></div>
<div class="yiv5858165617MsoNormal"><span
style="font-size:11.0pt;color:#1F497D;"> </span></div>
<div class="yiv5858165617MsoNormal"><b><span
style="font-size:11.0pt;">From:</span></b><span
style="font-size:11.0pt;"> <a
moz-do-not-send="true" rel="nofollow"
class="yiv5858165617moz-txt-link-abbreviated"
ymailto="mailto:drats_users-bounces@intrepid.danplanet.com"
target="_blank"
href="mailto:drats_users-bounces@intrepid.danplanet.com">drats_users-bounces@intrepid.danplanet.com</a>
[<a moz-do-not-send="true" rel="nofollow"
class="yiv5858165617moz-txt-link-freetext"
ymailto="mailto:drats_users-bounces@intrepid.danplanet.com"
target="_blank"
href="mailto:drats_users-bounces@intrepid.danplanet.com">mailto:drats_users-bounces@intrepid.danplanet.com</a>]
<b>On Behalf Of </b>Daniel Metcalf<br>
<b>Sent:</b> Friday, September 20, 2013 4:55
PM<br>
<b>To:</b> Discussion of D-RATS<br>
<b>Subject:</b> Re: [drats_users] ERROR
Correction in slow speed data</span></div>
<div class="yiv5858165617MsoNormal"> </div>
<div>Agreed. From what I have read d-star is a lot
like the UDP network protocol where it is
transmit and forget there is no handshaking /
error correction built in. It is up to the
application developer to handle error correction
and the d-rats package does perform some level
of error correction.</div>
<div>Dan Metcalf - KB3UUN.</div>
<div>
<div class="yiv5858165617MsoNormal">On Sep 20,
2013 3:54 PM, "John Davis" <<a
moz-do-not-send="true" rel="nofollow"
ymailto="mailto:jdavis@gtworks.com"
target="_blank"
href="mailto:jdavis@gtworks.com">jdavis@gtworks.com</a>>
wrote:</div>
<blockquote style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in;">
<div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span
style="font-size:11.0pt;color:#1F497D;">My
understanding is that the low speed
data channel does NOT have error
correction, however, D-RATS offers
Error correction in Message and File
Transfer modes where it is most
important.</span></div>
<div class="yiv5858165617MsoNormal"
style=""><span
style="font-size:11.0pt;color:#1F497D;"> </span></div>
<div class="yiv5858165617MsoNormal"
style=""><span
style="font-size:11.0pt;color:#1F497D;">John
WB4QDX</span></div>
<div class="yiv5858165617MsoNormal"
style=""><span
style="font-size:11.0pt;color:#1F497D;"> </span></div>
<div>
<div style="border:none;border-top:solid
#E1E1E1 1.0pt;padding:3.0pt 0in 0in
0in;">
<div class="yiv5858165617MsoNormal"
style=""><b><span
style="font-size:11.0pt;">From:</span></b><span
style="font-size:11.0pt;"> <a
moz-do-not-send="true"
rel="nofollow"
ymailto="mailto:drats_users-bounces@intrepid.danplanet.com"
target="_blank"
href="mailto:drats_users-bounces@intrepid.danplanet.com">drats_users-bounces@intrepid.danplanet.com</a>
[mailto:<a moz-do-not-send="true"
rel="nofollow"
ymailto="mailto:drats_users-bounces@intrepid.danplanet.com"
target="_blank"
href="mailto:drats_users-bounces@intrepid.danplanet.com">drats_users-bounces@intrepid.danplanet.com</a>]
<b>On Behalf Of </b>Dave Welker<br>
<b>Sent:</b> Friday, September 20,
2013 3:19 PM<br>
<b>To:</b> D-Rats Mailing List<br>
<b>Subject:</b> [drats_users]
ERROR Correction in slow speed
data</span></div>
</div>
</div>
<div class="yiv5858165617MsoNormal"
style=""> </div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">Hello all,</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">Can anyone confirm if the D-RATS
slow speed data has FEC (Forward
Error Correction) built in now or
not?</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">I understand that D-STAR voice
does have error correction built
in. I've checked on the D-RATS home
page/documentation</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">which is a August 2009 reference.</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""> </div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">This is what I found in this
document Under users manual/files:
Is this still current information?</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""> </div>
</div>
<div>
<div
style="margin:0in;margin-bottom:.0001pt;background:white;word-spacing:0px;"><b><span
style="color:#666666;">Unlike the
D-STAR DV Voice Channel, which has
error correction built into the
protocol, the Data Sub-channel has
no error correction. </span></b></div>
<div
style="margin:0in;margin-bottom:.0001pt;line-height:11.25pt;background:white;word-spacing:0px;"><span
style="font-size:9.0pt;color:#666666;"> </span></div>
<div
style="margin:0in;margin-bottom:.0001pt;background:white;word-spacing:0px;"><b><span
style="color:#666666;">This makes
the transfer of data across D-STAR
a lot more dependant on a good
radio path being established
between the two locations wishing
to </span></b></div>
<div
style="margin:0in;margin-bottom:.0001pt;line-height:11.25pt;background:white;word-spacing:0px;"><span
style="font-size:9.0pt;color:#666666;"> </span></div>
<div
style="margin:0in;margin-bottom:.0001pt;background:white;word-spacing:0px;"><b><span
style="color:#666666;">exchange
data. D-RATS includes the ability
to test connectivity between two
locations</span></b><b><span
style="font-size:9.0pt;color:#666666;">.</span></b></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""> </div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">Thanks in advance</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">regards</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">Dave</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">W2SRP</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""> </div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""> </div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">Goals are where we want to be;<br>
Objectives are the steps to get
there.</span></div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""> </div>
</div>
<div>
<div class="yiv5858165617MsoNormal"
style=""><span style="
">There are 2 rules to success in
life:<br>
1. Don't tell people everything you
know.</span></div>
</div>
</div>
</div>
<div class="yiv5858165617MsoNormal"
style="margin-bottom:12.0pt;"><br>
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