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Harald Welte laforge at gnumonks.orgOn Wed, Aug 08, 2018 at 05:12:56PM +0000, Stefan Sperling wrote:
> I am a bit confused about how GSM frame numbers work.
> Is my test supposed to receive consecutive numbers?
probably not, as not all logical channels are active? Also, every frame consists of 8 TS
which each transports one burst. Only four consecutive burst on a given logical
channel will render one block.
> Apparently I don't receive a DATA_IND in every GSM frame.
> If that is expected, I will need to count the number of DATA_IND frames received until I have received 104 of them. Simply checking for fn >= first_fn + 104 won't do.
you will not receive 104 data indications. Every frame (if a given logical channel is active in that frame)
will only transmit 1/4th of a block (l2 message).
During 104 frames, on a TCH/F, you should expect:
* 24 TCH/F or FACCH DATA_IND
* 1 SACCH DATA_IND
--
- Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/
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