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. Others believe that not taking the fiber all the way is a false economy that will result in expensive re-engineering as the demand for speed rises.Ethernet -over-Copper to Fiber converters (media converters) are rather simple devices with no complex additional settings. Many providers are reluctant to install fiber right into the customer premises due to concerns about installation costs/difficulties (you can't treat fiber the way telco installers treat copper and expect it to work reliablly). How best to provide "fiber" Internet services to homes and small business premises is something of an open question. ISPs may preffer DSL or DOCSIS though because of longer ranges and/or the ability to reuse existing infrastructure. The most obvious to us non-ISP folks being twisted pair Ethernet which commonly delivers gigabit speeds at distances up to 100 meters and can in principle deliver 10Gbps. it could refer to Twisted pair Ethernet, docsis (cable TV coax), various types of DSL, or various legacy telco technologies.īut yes there are plenty of technologies that can deliver 50 megabits per second or more over shortish distances on various types of copper cable. Smaller compact switches offer various interfaces on both RJ45 and fiber, which gives a great overall platform to convert from. Newer media converters are often really just a switch. Media converters may be simple devices, but they come in a dizzying array of types. These are typically labeled transmit (or Tx) and receive (or Rx). Thus, every fiber run in a system must include two fiber cables, one carrying data in each direction. One important difference to note between Cat5 and fiber is that Cat5 cables and RJ45 jacks are bidirectional while fiber is not. At the other end of the fiber cable run, a second media converter is used to change the data back to its original format. Media converters may support network speeds from 10 Mbps to 10 Gbps, thus there are Fast Ethernet media converters, Gigabit Ethernet media converters, and 10-Gigabit Ethernet media converters.įiber media converters change the format of an Ethernet-based signal on Cat5 into a format compatible with fiber optic cables. The fiber side usually has a pair of SC/ST connectors or SFP port. On the copper side, most media converters have an RJ-45 connector for 10BASE-T, 100BASE-T, 1000BASE-T and 10GBASE-T connectivity. The most common being UTP to multimode or single mode fiber. The style of connector depends on the selection of media to be converted by the unit. It can be installed almost anywhere in a network. Fiber media converter is a small device with two media-dependent interfaces and a power supply, simply receive data signals from one media, convert and transmit them to another media.
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