Re: ErrorModel rate_???

[Fusun Inanc <fusun@poptop.ee.psu.edu>]

Thanks Lloyd,

I changed it to byte and convert the bit error rate to
byte error rate . but i still have the same problem.
I think neither c++ nor TCL is sensitive to real numbers 
after 6 digits.

How can I increase it? 

I will show my simulation results:

Bit error rate = 0
Byte error rate = 0.0
Throughput for TCP connection = 7891200.0 Mbps

Bit error rate = 1e-6
Byte error rate = 7.999972000294342e-06
Throughput for TCP connection = 7815360.0 Mbps

Bit error rate = 1e-7
Byte error rate = 7.9999971958066851e-07
Throughput for TCP connection = 7891200.0 Mbps

Simulation time 50sec.

I have some dropped packets if BER is 10^-06
but if I increase it, no packet is dropped.
I want to see the effect of BER=10^-08 
in my simulation though.

Thanks,

Fusun Inanc



> > I am using ErrorModel agent in my simulation. And I want to
> > create a link which has a bit error rate of 1e-08.
> > 
> > If I set the rate
> > 
> > $loss_module1 set rate_ 1e-05
> > 
> > it drops packets.
> 
> If you don't specify the error rate as anything, it's packet rate
> (pkt), not bit rate.
> 
> I think you need to translate your BER into an approximately
> equivalent byte error rate, and do
> 
> $lossmodule unit byte 
> 
> first. (the end of nsDoc 12.1 says something about "either in packets
> of bits", which is extremely misleading, and imo needs fixing.)
> 
> L.
> 
> 
> > But if I set it to 1e-06 , 1e-07 and so on, It doesn't do anything.
> > I run the simulation 50 sec.
> > 
> > Is there a way to make the error rate more sensitive?
> > 
> > Thanks in advance...
> > 
> > Fusun Inanc
> 
> <L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>
>