Help with HFSC qdisc parameters

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http://www.linuxquestions.org – I'm trying to use hfsc, so I've read the HFSC Scheduling documentation with Linux I understand some concepts but shame on me, I don't understand how the values are calculated, for example: Quote: The concept of the interaction with latency resides in the structure of the service curves of the individual classes. By selecting a two-part service curve, each section of which is linear, the transmission delay for the Voice over IP class can be reduced to 30 ms. The first section of the service curve features a 400 kbit slope of 30 ms duration, where the second section exh (HowTos)