hi I'm a student and I work on wns, I'm implementing a Mac protocol and I have 
some unclear concepts, help plz!
1)What is CC2420_TIME_ACK_TURNAROUND? and what is the difference between it and 
 CC2420_ACK_WAIT_DELAY?
2)In my protocol I want to use the preamble, I read in the cc2420 that there is 
a physical preamble that its length can't be greater than 4bytes. But how can I 
send mac preamble that its length is greater than 4bytes?
wait for answers.thx                                      
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