Расчет normal burst extended burst

Официальный cisco
normal burst = configured rate * (1 byte)/(8 bits) * 1.5 seconds
extended burst = 2 * normal burst

1 вариант
normal burst = configured rate / 16
extended burst = 2 * normal burst

2 вариант
normal burst = configured rate * 3 / 16
extended burst = 2 * normal burst