Hmm, as far as I know the limitations would be the same as the that from the CO. Based on wire gage and loading coils, etc. I'll try to find someone more up on OSP stuff than me and see if I can find you a specific. Is there a problem you are trying to solve or is this a layout/design issue?
It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com