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bandwidth and payload length of 52833

user7972

Hi Nordic,

One of my customer do business with Japan company, they employ nRF52833 and SDK17.1.0, they have two questions.

1.What is the bandwidth of coded phy.

As for WIFI, we can set the bandwidth as 20M or 40M, so what's the bandwidth of Coded phy S8 and S2, is it 2M or 125K/500k?

2.When dealing with DTM test, the maximum of Payload length is 255(PRBS9 Model), It's OK with the 1M/2M phy, but when we select the coded phy, it seems not work.

So what's the maxinum Payload length of coded phy?

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    Hello Helen,

    Thanks for your queries.

    1. We have full support for S=8 (125K). SoftDevice does not have full support for S=2 (500 kbps). The application can not select S=2, so all packets are transmitted using S=8 when coded PHY is used. However, the nRF can receive both S=2 and S=8 coded packets from the peer.  

    2. The maximum Payload length of coded phy is 20 bytes.

    Payload (27) - L2CAP header(4) - ATT header (3) = 20

    Hope it helps. 

    Best Regards,

    Kazi Afroza Sultana

  • 0 in reply to user108933

    Dear Kazi，

    Thanks for your reply。

    We understand the second question, and will you kindly answer the first question.

    What is the "occupied bandwidth" of coded phy?Is it 2M?

    We havn't found this in the core specification v5.3, where can we find explanation for this part?

    Wish for your reply~

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