TeddyKGB, you mentioned about connecting to Netgear - we have a Procurve 4865A as a core switch and its connected to Netgear switches in the comms cabinets (GS742T's mainly) with mini GBICS on 62.5/125 fibre. It works fine, but Netgear GBIC modules won't work in the HP switch. So we use HP GBICS in the Procurve, Netgear GBICS at the Netgear end, all works fine, and saves a bit of cash as the HP GBIC modules are significantly more expensive than the Netgear ones.