No subject

Number of symbols in a burst =3D 156.25 symbols, and burst time 156.25 x<br=
>
3.69... =3D 576,92=ECs<br>
Number of symbols in TDMA frame is 8 x 156.25 =3D 1250 symbols,<br>
Number of symbols in Multiframe is 26 x 1250 symbols.<br>
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On Fri, Jan 7, 2011 at 8:51 AM, Nataraju A B <<a href=3D"mailto:nataraju=
ab.tech at gmail.com">natarajuab.tech at gmail.com</a>> wrote:<br>
><br>
> Hi Andreas,<br>
> Thanks for the speedy reply.<br>
> The link which sent you is=A0definitely=A0useful. But the very basic q=
uestion I wanted to get a clarification was that, what is the drive behind =
selection of burst time to be 577us.<br>
> For example the audio frequency can range upto 4Khz. The sampling freq=
uency should be 8Khz. If each sample is of 8 bit accuracy. This lead to 64K=
 bits of data. ...... =A0If we explore further on these lines we should be =
able to correlate to the time 577us for each burst.<br>

> I wanted some more info these lines. What was/were the drives behind s=
election of this burst time. Otherwise what are the other end requirements =
led to selection of this burst time and in turn TDMA frame hierarchy.<br>

> Thanks,<br>
> Nataraju A B<br>
> On Fri, Jan 7, 2011 at 7:01 PM, Andreas.Eversberg <<a href=3D"mailt=
o:Andreas.Eversberg at versatel.de">Andreas.Eversberg at versatel.de</a>> wrot=
e:<br>
>><br>
>> in addition:<br>
>><br>
>> Traffic Multiframe Structures - The 26 traffic multiframe structur=
e is<br>
>> used to send information on the traffic channel. The 26 traffic<br=
>
>> multiframe structure is used to combine user data (traffic), slow<=
br>
>> control signaling (SACCH), and idle time period. The idle time per=
iod<br>
>> allows a mobile device to perform other necessary operations such =
as<br>
>> monitoring the radio signal strength level of a beacon channel fro=
m<br>
>> other cells. The time interval of a 26 frame traffic multiframe is=
 6<br>
>> blocks of speech coder data (120 msec).<br>
>> (<a href=3D"http://www.althos.com/tutorial/GSM-tutorial-frame-stru=
cture.html" target=3D"_blank">http://www.althos.com/tutorial/GSM-tutorial-f=
rame-structure.html</a>)<br>
>><br>
>> one encoded speech block lasts 20ms.<br>
>><br>
>><br>
>> =A0 =A0 =A0 =A0576,92307692307692307692307692308us per slot<br>
>> =A0 =A0 =A0 =A04615,3846153846153846153846153846 per 8 slots (1 fr=
ame)<br>
>> =A0 =A0 =A0 =A0120ms per 26 frames (6 speech blocks)<br>
>><br>
>><br>
>><br>
><br>
><br>
><br>
> --<br>
> Thanks,<br>
> Nataraju A B<br>
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br>Thanks,<div=
>Nataraju A B</div><br>

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