The 100Mb SFPs will only work with the WS-X6148-FE-SFP module.
The sup720 uplink ports support the following SFPs
GLC-T (1000BASE-T)
GLC-SX-MM
GLC-LH-SM
GLC-ZX-SM
GLC-BX-D, GLC-BX-U
HTH
Ankur
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