The DIN-rail mountable 500NMD20 is a managed
plug and play layer-2 switch providing four Fast
Ethernet auto-negotiating RJ45-ports with auto
MDI/X (Automatic Crossover Detection and Correction)
and two SFP (small form-factor pluggable)
module slots for use with fibre optictransceivers. Depending on the SFP module
equipped, the unit is able to span distances by fibre
optic cable up to 40 km (or even more with
special SFP modules). The switch is able to provide
redundant topologies by the
