Redundant Ring Switch
RS-405 series: Managed ring switch with up to 8x Fast Ethernet RJ45 ports and 2 fiber optic interfaces (Fast Ethernet) - Depending on the fiber optic type (multimode / singlemode), either ST (BFOC) or SC connectors are available.
RSM-405 series: Technically identical to the RS-405 series, but with a metal housing instead of a plastic one.