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plannerguy
2009-05-28, 10:26 PM
Hi Freinds,



please explain how you are able to calculate the time of one "time slot".

I now it is 0.577micro seconds , in every doc it is given as 15/26 etc.no explanation given in docs.

on what basis it is calculated.



regards
Plannerguy

alkesh
2009-05-28, 10:34 PM
Hello Plannerguy,

Time period is calculated on the basis of normal burst

Normal burst is 156.25 bits = data in one time slot
1 bit duration = 3.69 micro seconds

Time period of one time slot = 156.25 bits x 3.69 micro seconds/bit = 0.577 milli seconds (577 micro seconds)

Hope this helps.

plannerguy
2009-05-28, 10:39 PM
Hi alkesh

Thanks for fast reply ............, the explanation is enough., i got it.....

any information on what is 15/26?

which is given in dos.......


Regards
Plannerguy

alkesh
2009-05-28, 10:59 PM
I am not too sure about 15/26. will let you know if I find out.





Hi alkesh

Thanks for fast reply ............, the explanation is enough., i got it.....

any information on what is 15/26?

which is given in dos.......


Regards
Plannerguy

wolverine
2009-05-28, 11:04 PM
15/26 is the same number expressed as a fraction.

If you perform the division on a calculator you will get 0.577 (at 3 decimal places)

ghassen
2009-05-28, 11:05 PM
Hi alkesh

Thanks for fast reply ............, the explanation is enough., i got it.....

any information on what is 15/26?

which is given in dos.......


Regards
Plannerguy
this the clock signal division inside the mobile station we have
bit duration = 48/13000000 = 3.69 e-9 -> each 48 bits of the internal clock which frequency is 13 khz the mobile station will generate a bit in the TDMA frame this clock signal is generated by a quartz and you multiply by 156.25 you ll find your result :
48*156.25 = 7500
7500/13000000 = 75/130000 = 15 * 5 / 130000 = 15 / (0.2 * 13000 ) = 15 / 2600 = 576

alkesh
2009-05-28, 11:06 PM
Very true. Missed out on this. Checked on scientific calculator.

Thanks.



15/26 is the same number expressed as a fraction.

If you perform the division on a calculator you will get 0.577 (at 3 decimal places)

plannerguy
2009-05-29, 10:48 PM
hi

Hassen Bhai

thanks for the Great answer

i was searching for this answer for past one year........

again thanks for the solution.


Regards
Plannerguy

kahnoie
2009-06-13, 08:00 PM
GSM channel = 8TS =4.615 ms frame duration
Hence 1 TS = 577 ยต-s = 156.25 bits

Regards,
Amit
agarwalamit081@gmail.com

ghassen
2009-06-13, 08:10 PM
hi

Hassen Bhai

thanks for the Great answer

i was searching for this answer for past one year........

again thanks for the solution.


Regards
Plannerguy

juste to correct i'm ghassen not hassen thx :p

plannerguy
2009-06-15, 04:58 PM
ok Ghassen boss.

Once more thanks for reply

Regards
Plannerguy