The ConneXium switch part#499NSS25102 has 3 10BASE-T copper ports and 2 100BASE-FX single mode fiber ports. So the closest replacements to this switch would be the ConneXium Part#TCSESM043F2CS0 (2- 10/100BASE-TX copper ports and 2- 100BASE-FX single mode fiber ports) or the ConneXium Part# TCSESM083F2CS0 (6 10/100BASE-TX copper ports and 2 100BASE-FX single mode fiber ports) switches..