What does it represent ?
		We know that          Td ~ r (utilization factor) If r grows than    Td grows If linear than      C  ~ K * 1/Td If non-linear   We have problem But we know that we deal with Bottleneck band hop which can:    - eliminate previous Td    - replace them by own Td ~ Lpacket/C    - Queuing start to play important role Use non linear solution