B+B SmartWorx 10/100/1000Mbps 2TX/2SFP Intelligent Media Converter - 2 x Network (RJ-45) - Gigabit Ethernet - 10/100/1000Base-T, 1000Base-X - 2 x Expansion Slots - SFP (mini-GBIC) - 2 x SFP Slots - AC/DC - DIN Rail Mountable, Wall Mountable

The IMC-574I is a value-based, managed Gigabit Ethernet solution that is ideal for use in fiber infrastructure. The IMC-574I comes with two SFP ports and two fixed 10/100/1000Base-T copper ports. There are four distinct DIP switch selectable configurations that feature the IMC-574I to be a 1+1 uplink port revertive mode, a 1+1 uplink protection non-revertive mode, a 4-port Gigabit switch, and a dual copper-to-fiber SFP media/mode converter (two Gigabit fiber media converters in one).

The term "1+1" refers to line protection where identical information is transmitted on two lines. The receiver chooses its communication line based on the revertive or non-revertive configuration. When a fault is detected on the active line, the traffic is switched to the redundant line. In the non-revertive mode, data is not resumed back to the original line unless the backup line fails or is disconnected. Once the original line is no longer in a fault condition, data can be resumed back to the original line.