Fiber Manager doesn't currently do anything with regard to tracking/modifying port speeds, so this change wouldn't be occurring due to any functionality in the core product.
Is there any customization or additional functionality in place with your deployment? My guess is there is, but otherwise, I'd need to know more about the data model and which feature has the SFPCapacity value as a field.
Hi Tim, long time no speak.
I have to resolve a problem on my new desktop (VBA Compatibility error) after doing a full install of ArcGIS/ArcFM/FiberManager this morning. As soon as that's out of my way, I can get you more detail on this.