Now consider an alternative set of equations for EF PHB:

where Dj = departure time of the jth EF packet to arrive at this node and destined to depart from I; measured at the time the last bit leaves the node Fj = target departure time for the jth EF packet to arrive at this node and destined to depart from I; the ideal time at or before which the last bit of that packet leaves the node Ep = Error term for the treatment of individual EF packets; it represents the worst case deviation between actual departure time of an EF packet and the ideal departure time of the same packet Aj = arrival time at this node of the last bit of the jth EF packet to arrive at this node and destined to depart from I Lj = length in bits of the jth EF packet to arrive at this node and destined to depart from I R = EF configured rate at I in bps; this is not the actual data rate on the line but rather the desired data rate for this EF PHB Explain the difference between this definition and that of Problem 9.9.

D; F + E, j>0 F = Do=0 F=MAX[A,, MIN(D-1 F-1)] + (L/R)