Let me update my question, I made a mistake on my first explanation.
Again, I have 1 ADSL and 1 HDSL, if I put both into a ROUTING GROUP (System->Routing->Group) using Tier1 for BOTH, I don't have the SUM of the bandwidth BUT the difference!!!!.
Can someone explain me where is my error?
I test it with "Member Down", "Packet Lost", "High Latency", and "Packet Lost or High Latency", in all the cases I have less bandwidth than the sum (near 5 to 7M).
Thanks in advance.