Hi Andreas,

Thanks for the speedy reply.
The link which sent you is definitely useful. But the very basic question I wanted to get a clarification was that, what is the drive behind selection of burst time to be 577us. 

For example the audio frequency can range upto 4Khz. The sampling frequency should be 8Khz. If each sample is of 8 bit accuracy. This lead to 64K bits of data. ......  If we explore further on these lines we should be able to correlate to the time 577us for each burst.

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

Thanks,
Nataraju A B

On Fri, Jan 7, 2011 at 7:01 PM, Andreas.Eversberg <Andreas.Eversberg@versatel.de> wrote:
in addition:

Traffic Multiframe Structures - The 26 traffic multiframe structure is
used to send information on the traffic channel. The 26 traffic
multiframe structure is used to combine user data (traffic), slow
control signaling (SACCH), and idle time period. The idle time period
allows a mobile device to perform other necessary operations such as
monitoring the radio signal strength level of a beacon channel from
other cells. The time interval of a 26 frame traffic multiframe is 6
blocks of speech coder data (120 msec).
(http://www.althos.com/tutorial/GSM-tutorial-frame-structure.html)

one encoded speech block lasts 20ms.


       576,92307692307692307692307692308us per slot
       4615,3846153846153846153846153846 per 8 slots (1 frame)
       120ms per 26 frames (6 speech blocks)






--
Thanks,
Nataraju A B