It appears from the Cisco doumentation that the Sup32 engine is incompatible with mixed-media (i.e., SFP, GBIC) based GigE interface modules. Can that be? For example a Sup32 with a WS-X6516A-GBIC or WS-X6416-GBIC is not supported (according to http://cisco.com/en/US/products/hw/switches/ps708/products_data_sheet0900aecd801459a7.html ) Joe