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[ns] poission traffic generation for wireless network



Hello,
I am still having trouble generating a Poisson traffic for wireless node.
The scenario is to send a Voice traffic between the wireless node and 
wireline node.
I have modified the wired-cum-wireless-sim.tcl code for the simulation.
I am using NS 2.1b8a.
The error message is dumped as follows and the script is attached.
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num_nodes is set 3
warning:Please use -channel as shown in tcl/ex/wireless-mitf.tcl
*** NOTE: no connection pattern specified.
Loading scenario file...
Load complete...
Starting Simulation...
(null)-invalid packet type(exp).
______________________________________________________________
Any help will be appreciated.
Thank you very much.

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uscs_sim1.tcl