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# TBF

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• #61797 Reply guru
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Hi bijoy can you just explain what is TBF and how we calculate the throughput speed

#61798 Reply Bijoy
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A Temporary Block Flow (TBF) is a logical connection between the BSS and the MS. A TBF is set up when there is data to send at the BSS or MS side.

Let us take an example to understand the concept of throughput.

Total LLC data volume of GMM/SM signaling transferred
100 kbit with 20 kbit/s + 200 kbit with 30 kbit/s

Num = 100*20+200*30 = 2000 + 6000 = 8000 kbit2/s
Denom = 100 + 200 = 300 kbit

So,throughput(LLC)=Num/Denom=8000/300=26.6 kbps.

Br\\
Bijoy

#61799 Reply guru
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Thanks bijoy

#61800 Reply b2002
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Dear Bijoy,
u r explaind here is downlink TBF. But here what is Denom.what is purpose of Denom. how to find the Upliink TBF value.

Sincerly Best Regards
B2002

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