[ns] Generating traffic UBR for NS-2

[Regis Model]

Generating traffic UBR (Unspecified Bit Rate) for NS-2 in nets wireless
802.16

I am using the RAMP, but I am not obtaining to make link with the NS.
Somebody can help me?
Exists some tutorial one for the RAMP?
Or some another tool to generate traffic web?

Régis Model