I just replaced an old HP switch with a 2810-24G (J9021A) with (4) HP PROCURVE GIGABIT SX-LC MINI MODULES (J4858C). The old media converters (10/100) are not working with this new switch. This switch's new fiber ports are 1000SX; I think i need new media converters that will work with the 1000SX ports and be compatible to the other 10/100 switches that they are currently connected to. Plus the media converter will have to have ST connections. Is there such a thing?