Belden · Industrial Networking. ***Discontinued*** The MS20 Layer 2 switches have up to 24 Fast Ethernet ports and are available in a 2- and 4-slot version (4-slot can be expanded to a 6-slot using the MB backplane extension). They require the use of hot-swappable media modules for any combination of copper/fiber fast device replacement. The MS30 Layer 2 switches have the same functionalities as the MS20 switches, with the excep

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