View Full Version : Time period of a Time slot
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
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