[ns] question on TwoStateErrorModel

["Neeraj Poojary" <legolas_3@hotmail.com>]

hi all,
  can somebody explain to me how the two-state errormodel determines its 
dwell time in a state? i instantiated an error model with exponential random 
variables. from my simulations and from reading the code, it appears the 
dwell time seems to be exponential w.r.t number of packets received, not 
w.r.t simulation time i.e., if (and only if) a packet arrives at the 
errormodel, it decrements remainLen_ by PktLength() and changes state if 
remainLen_ goes below zero. this means the errormodel will never change 
state if i don't put any packets in the channel (or am i reading something 
wrong here)? i would like to have an error model whose remainLen_ is 
specified in terms of simulation time, not packet lengths. does an error 
model exist that does something similar or would i have to write my own 
(using 'TimerHandlers')?

thanks,
neeraj
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