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[ns] meaning of time in trace file

Hi,

Can anyone please tell me the exact meaning of 
the time field in the trace file? I mean:

For Send event, the time is: the FIRST bit of the packet 
is going to be sent out, or the LAST bit is just sent out?

For Receive event, the time is: the first bit of the packet
is going to be received, or the whole packet is just received?

A further question is : where is the code inserting 
these tracers? when are these tracers called?


Thanks for your help. 

Alan