Figure 5: Converter A switches off copper cable connection.Figure 4: Converter B switches off the second optic fiber cable core going to converter A.Figure 3: Converter B switches off copper communication.Figure 2: One of optic fiber cable cores going from converter A to converter B gets broken.Figure 1: Normal operation of two media converters.The detailed operation of FEF is given in fig.
Here is where the Far End Fault function comes in. However, if another optic fiber cable core is still safe, the switch on the right will continue transferring data to the switch on the left, which can lead to transmission errors within the whole network. In this case, the left converter will not be able to transfer data to the right converter. Let us consider, what will happen, if one of the optic fiber cable cores connecting the media converter on the left with the one on the right breaks. 2 Link Fault Pass-through in operationįar End Fault (FEF 802.3u) – function serves to notify on a breakdown of one of the optic fiber cable cores (!). For that reason, there appeared such functions as “Link Fault Pass-through” and “Far End Fault”.įig. That may sound rather simple, however, when used together, such “cable” actually comprises two copper cables and two fiber optic cables (see Fig. Basically, a media converter must “simulate” a cable. The converter must remain invisible to network devices. Needless to say, that the basic role of a media converter lies in data transfer between two devices that can’t be connected to each other directly. This is true, however, modern media converters also support the functions that, if applied correctly, can enhance network reliability. One might think, that the sole purpose of a media converter is to convert a signal from one transfer medium (copper wire) to the other (optical fiber). This article includes recommendations on application and choosing media converters, operation principles of “Link Fault Pass-through” and “Far End Fault” functions, as well as converters behaviour in redundant networks. Meanwhile, they have their own application specifics that must be considered when building a network. Ethernet -over-Copper to Fiber converters (media converters) are rather simple devices with no complex additional settings.
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