That's what I thought. I opened a ticket with support, because my graphs of "average over 1min" shows 1mbps utilization while the 1.5mbps is in use (it's a T1). To rephrase this, I have a lot of T1s and it can be 100% utilized for 3-4hrs at 1.5Mbps, which correctly shows in cacti (which I'm trying to retired), but Orion shows 1Mbps flat line....
Support collected some snmpwalk info and went back to research. Awaiting their feedback now.