Does anyone know if the GLC-T (1000base-T SFP) will run 10/100/1000base-T or only 1000base-T in a 6724 or 6748 on a C6K? I know it'll do 10/100/1000 in the DSBU switches (small ones), but I'm not sure about the C6K and couldn't find anything authorative. TIA, -A