[ns] Question ----about simulation with DCF!!! Thanks

["Pianca" <pianca@ms6.url.com.tw>]

Hi there:

I've simulated with the DCF in 802.11.
And I'm wondering how is the parameter input for the DCF.
1. For example, what is the value of SIFS, DIFS, 
   maximum packet length, fragmentaion threshold?
2. I've used the CBR traffic, and set the bytes with 512.
   what is the unit of 512? byte or bit?

Thanks.