On 10/10/2013 03:04 PM, Peter Lothberg wrote: FDDI/CDDI is a dual ring token ring bus, with 4470 MTU byte packets, it has 802.-- frames. DEC had a mode where you turned the token off and used it for ptp full duplex. I didn't know about the ptp thing. That's nifty. A cisco FDDI-PA can talk both in a 7500 or old 7200 (the VXR don't support the FDDI cards but the VIP does ). About that, Peter...is there ANY way to get a FDDI PAM to run in a 7206VXR? Or will it just plain not work, ever? -Dave -- Dave McGuire, AK4HZ New Kensington, PA