I'm somewhat confused as to why you would say you offer full duplex FDDI in a manner that implies no-one else does. If someone walked up to your GIGAswitch/FDDI (or anyone's) with a full duplex line card, they'd get full duplex unless you took some specific action to prevent it (by, say, putting three stations on a ring), or if you disable it in management (it comes enabled by default).
Well, because when I talked to MFS they said they would don't turn on full duplex modem, I got the same thing from PAIX.
Full-duplex mode is enabled on all ports on the PAIX GIGAswitch/FDDI; we never disabled it.
No, I turn it on, so far all the NAPs I have turned it off. If MFS and PAIX wants to turn it on then great.
Like I said above, PAIX never turned it off. If you'd like to follow up privately to work out the source of your error, you know where to find me. Stephen