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
<div><div></div><div class=3D"h5"><br
<br
<br
<br
<br
<br
<br
<br
On Fri, Jan 7, 2011 at 8:51 AM, Nataraju A B <<a
href=3D"mailto:nataraju=
ab.tech@gmail.com">natarajuab.tech@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@versatel.de">Andreas.Eversberg@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-…
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
--00163641691bea689c04996d367c--