AT86RF215: OFDM Transmission time is too long

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Hi ALL,

 

I am using AT86RF215M configured to transmit at MR_OFDM 2400 kbps.

 

I expect that time to transmit 2047 bytes will require

 

2047 * 8 / 1000 / (2400)  * 1000 = 6.9 ms

 

But i see that time between I switch to TX sate and TXFE interrupt is 8 ms.

 

Why the time is larger?

I am not using CCA procedure. It is disabled.