Let a reservation frame contain 
r bits and a data frame contain 
d
bits. The total bits sent for one go-around of the reservation frame is
r + 
nd where 
n is the number of data frames sent, and the number
of useful (non-overhead) bits sent is 
nd, for a utilization of
nd/(
nd + 
r).  If 
d >
> r (by a factor of 10, say) than even for small values
of 
n the utilization is near 1.
This page last modified on 2006 January 24.