You can know if it is DTX by checking for SID messages before it drops and before it resumes. A simple way to check if it is DTX  is to watch SNR level during speech/pause.<div><br></div><div>If you are <u>not</u> using AMR, then you can check signal strength only for the mandatory frames which are listed in TS 05.08 / 8.3.</div>
<div><div><br></div><div>FACCH specs will be in TS 05.03. But AFAIK it will not help for this purpose.</div><div><br></div><div></div><div>You cannot Google these things. You will have to read the specs from the 3GPP website <a href="http://www.3gpp.org/specification-numbering">http://www.3gpp.org/specification-numbering</a></div>
<div><br></div><div>B</div><div><div><br><br><div class="gmail_quote">On Tue, Feb 12, 2013 at 5:46 PM, Pe <span dir="ltr">&lt;<a href="mailto:oxccoxcc@yandex.ru" target="_blank">oxccoxcc@yandex.ru</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, Bhaskar<br>
I have the same problem with periodical channel dropping from snr 255 to snr<br>
less then 10. It is not because of DTX, as i think. May be it is because of<br>
handovers, but dropping is too often.<br>
I did not use FACCH information yet.<br>
Can you get a reference to document with facch decoding scheme? google didnt<br>
help.<br>
<br>
<br>
<br>
--<br>
View this message in context: <a href="http://baseband-devel.722152.n3.nabble.com/Structure-of-traffic-data-in-burst-ind-messages-tp4025762p4025826.html" target="_blank">http://baseband-devel.722152.n3.nabble.com/Structure-of-traffic-data-in-burst-ind-messages-tp4025762p4025826.html</a><br>

<div class="HOEnZb"><div class="h5">Sent from the baseband-devel mailing list archive at Nabble.com.<br>
<br>
</div></div></blockquote></div><br></div></div></div>