Fiber optic ethernet systems are based on multimode and single mode fiber optic cables and connectors ,depending on the speed of the ethernet media system and the type and wave length of fiber optic transmitters used in the system,the behavior of fiber optic media can vary.This is especially true for the gigabit ethernet fiber optic system,which sends very high frequency signals over fiber optic cables.

There are a wide variety of fiebr optic cable types ,which are use according to the task at hand ,fiber optic patch cords typicallly consist of two fiebrs,either multimode or single mode depending on your requirements,patch cords can be quuipped with whatever,in the vast majority of structured cabling systems today,category 5 or 5e twisted -pair horizontal cables are used to deliver ethernet signals to the desktop,fiber optic backbone cables are commonly found in struchtured cabling systems,these backbone cables typically contain 12 or 24 fiebrs,but they may also contain dozens of fiebers ,for large baackbone cable installations,fiber optic cable manufactureds will build cables to order depending on your requriements.

single mode fiber has a much smaller core with the same 125um outer cladding commercial single mode fibers have core diameters that can vary over the range of approximately 8-10um ,they are collectively referred to as 10um fiber in the standard ,by way of comparison ,a human hair has a diameter of about 100um. A fiber optic mode is a path that light can follow in traveling down a fiber.As the name implies, multimode cables have a larger core designed to support multiple code, or patchs, of light propagation, then multiple paths of light from the LED are transmitted over the cable as showed in figure16-1. LC-LC Single Mode Patch Cord describes a fiber with a small core,only a few times the wavelength of light transmitted, that only allows one mode of light to propagate, it is commonly used with laser sources for high speed,long distance link.

A variety of fiber optic connectors are use,depending on the cable type and the ethernet media system,the most commonly used fiber optic connectors as of this writing are the ST and the SC connector,The ST connector is specified for use on 10BASE-FL equipment,A new connector called the MT-RJ is showing up on many ethernet hubs ,since it is compact and allows vendors to fit more fiber optic ports on a given hub module or faceplate other small form factor fiber optic connectors have been developed,such as the 3M volition VF45，and you may find these in use as well.For hormonal fiber optic segments installed as part of a structured cabling system,the connectors on the fiber optic cable should be oriented to achieve the crossover.The LC fiber patch cable connector is used on small diameter cable. The Cable Assembly Type is LC LC Fiber Patch Cord .

On the other hand,SC fiber products are commonly seen and SC fiber optic connectors are found on many equipment and cable assemblies. The LC-SC Patch Cord features its easy operation, good accuracy and low cost. backbone fiber optic cable systems that go between floors of a building,or between building on a campus are typically wired straight through when making a connection between an ethernet hub and a backbone fiber optic system you need make sure that the signal crossover is achieved in the patch cable at one end of the link.

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