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Error MOdel failure!!!



hello 
I have the 2.1b4 version of ns.I write the following tcl script 
...
$ns duplex-link $RoutA $RoutB 54kb 280ms RED
set queue [new Queue/RED]
set qlim_ 100
set link [new SimpleLink $RoutA $RoutB 54kb 280ms $queue ]
set loss_module [new ErrorModel]
$loss_module set rate_ 3.0 10e-5
$link install-error $loss_module
$ns at 1.0 "$ns lossmodel $loss_module $RoutA $RoutB"
...
it seems that ns don't take consideration with the bit error rate parmeter
because there is no change in results whene i change the bit-error-rate(BER)
of my link.

I'm waiting for your help
thanks




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