Which ethernet cables are fiber optic?

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I too am not sure you are going down the correct path. What type of cable are you using now? CAT3? I might suggest you switch to UTP Cat5 or even move to shielded twisted pair. Fiber is immune to EMI, both reception and transmission, and it also has the advantage of preventing ground loops which may be a bigger problem than EMI. However the fiber GBIC's are not as reliable as the copper ports. If your data center is that dirty, I would look into your grounding and power for sure.

Is it the Ethernet you are trying to protect, or sensitive analog running near it? Two very different problems.
 
ggking: i work with fiberoptics daily, in our metro network. And i can tell you, that yes - those will work together. Just remember to swap TX/RX in each side when you plug them in. Also, you maybe have to change some dip-switches on each side to have network auto detect work.
 
You can use normal Cat5 cables, crossover not needed. What i meant with swapping Tx/Rx is that you have to cross the fiber patch cord between both fiber converters. (Tx from one side to Rx on the other and the other way around on next fiber)
 
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