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Time Inter Frame Space

Jusang kim
Prodigy 50 points

I'm using TI packet sniffer to develop BLE protocol stack. But strange thing about the time inter frame space came up to me.

Based on BLE specification the time interval between consecutive packets is 150us. However as you can see in the above captured figure from sniffer, the time interval between first advertising packet and scan request packet is 366us. Does anyboby help me understand about this ?

  • 0
    TI__Guru** 105180 points
    Hello Jusang,

    I don't see an attachment. Please use rich formatting to attach a file. Please note that the 150us T_IFS applies to the TX to RX transmission.

    Best wishes
  • 0
    Prodigy 50 points

    I upload my question again with the following attatched picture because JSX told me that he can not see the following picture in my previous question.

    what i have doubt is why the time interval between p.nbr. 64 and p.nbr. 65 is 366us in the following picture on TI packet sniffer ? and samething happens in between scan req. and scan response in the following picture. 

    The time difference between consecutive packets on the same channel shall be 150us + some clock skew as far as i know based on the specification.

    Does anyone correct me if i am wrong ?

  • 0 in reply to Jusang kim
    TI__Guru** 105180 points
    Hello,

    The TI packet sniffer doesn't provide a breakdown of the inter frame timing. For this, you will need a commercial sniffer, such as Frontline or Ellisys.

    Best wishes