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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#548DD4'>Hi Scott,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#548DD4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#548DD4'>Here is the response from our radio guru.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#548DD4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#548DD4'>Rob<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#548DD4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>“</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>Yup, not unexpected at all. What is happening is common with
RF equipment used around other electronics. It is called Radio Frequency
Interference or RFI. Radio transmissions can cause microprocessors and
other digital electronics to act very erratic and unpredictable. It is
not uncommon to see microprocessor core devices either hang or re-boot.</span><span
style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:red'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>There are a number of fixes for such problems:</span><span
style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:red'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>1. Remove the radio equipment from the other electronic
device. While this is simple it is not always practical.</span><span
style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>2. Reduce the power output of the radio device.</span><span
style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>3. Use a remote or external antenna for the radio (almost the
same are removing the radio from the area.)</span><span style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>4. Use a different RF frequency for the radio (another channel
or another band.)</span><span style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>5. Apply RFI filtering to the device failing. This is
not simple. Complex engineering and design changes are often
needed. But sometimes simple fixes can be found: RF chokes on
cables going into the devices (by use of ferrite beads and by-pass capacitors),
proper grounding of affected devices, and better shielding of those
devices top the list. </span><span style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:red'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>I am seeing more and more of these problems on a daily basis as more
and more things are controlled by electronics - even toasters, Li Ion
batteries, shavers and toothbrushes have microprocessors in them now and are
suseptible to RFI. They are sometimes simple to solve but often
take work and prompt a device re-engineering. Some things are just not
designed to work in a thick RF environment...</span><span style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:red'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>Not really a good answer but this IS the starting point (the
proverbial tip of the iceberg...)</span><span style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:red'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:red'>Scott” </span><span style='color:red'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#548DD4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#548DD4'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> cisco-voip-bounces@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net] <b>On Behalf Of </b>Wes Sisk<br>
<b>Sent:</b> Monday, March 10, 2008 2:53 PM<br>
<b>To:</b> Scott Voll<br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] Radio caused reboot of IP phones<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Known issue and not much we can do about it. Phone has
to be susceptible to RF interference by FCC rqmt. Some phone models are
more/less susceptible by housing insulation, but all do reset with enough RF
close enough.<br>
<br>
/Wes<br>
<br>
Scott Voll wrote: <o:p></o:p></p>
<div>
<p class=MsoNormal>Has anyone seen this before.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>one of our sites uses Kenwood ProTalk radios. if you
key the radio the IP phone (794x) phone reboots. Totally
reproducable. Key the button reboot. <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Is this a know bug? anyway to fix it? in the
event of an emergency when both phone an radio are needed, this could be really
bad news!<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>TIA<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Scott<o:p></o:p></p>
</div>
<pre><o:p> </o:p></pre><pre style='text-align:center'>
<hr size=4 width="90%" align=center>
</pre><pre><o:p> </o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>cisco-voip mailing list<o:p></o:p></pre><pre><a
href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><o:p></o:p></pre><pre><a
href="http://portal.mxlogic.com/redir/?1jKUMyYy-yYrjKUOUqerTojdAVPmEBCbdSaY3ivNU6U9GX33VkDa3JsJaBGBPdpb6XZuZQrFTjLsTsTqlblbCqOmbAaJMJZ0kIToHMd9_7wqro7cK6QkXLEL9KcTdI6zAS2_id41FrJaBGBPdpb6BQQg0Lk9ld45JrFW1EwzV2JpCy2HFEw3gIq85ytovgTfM-u0USyrhdFTspsd7dXIcCOXs8">https://puck.nether.net/mailman/listinfo/cisco-voip</a><o:p></o:p></pre><pre> <o:p></o:p></pre></div>
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