Thanks. I not very familiar with the integrated DSU T3/E3 command set - still used to the good ol HSSI ports. I'll agree, this sounds like a better solution if you are using one of the integrated cards.
Yes - you are correct, in my solution both sides should always use a traffic-shape or other shaping QoS command. The rate limit is a final "police" in case the customer does try to send more than you would like them to. Again, agreed, obviously if you can control the port speed (above - DSU bandwidth), that's a better solution.