dtmc

const double a = 0.01;
const double b = 0.05;

init 
true
endinit

module Channel
s : [0..1];
[] s=0 -> a : (s'=1) + 1-a : (s'=0);
[] s=1 -> b : (s'=0) + 1-b : (s'=1); 
endmodule