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SFP is a choice or just use media converters for fibre optics for your backbone.
Evaluate the prices and choices.
There are APs or routers with SFP, good for bridging, routing, doing some sort of control and such.
There are media converters
So the cost is either using a media converter or SFP + the SFP module
If you are setting up a tower in the center and have multiple APs, you can get a POE switch with SFP so it makes powering everything easier and it would have built in SFP too.
Depending on whether you have any buildings that use wire on the inside you can either put your main router/modem with the tower or in the main building, really depends on your setup. If none of the buildings are using any wire connections inside for networking than your main router can be with the tower in which case you wont need SFP or media converters except for internet and you wont need to worry about a backbone over a larger distance.
While ethernet is rated up to 100meters there are cables that dont fit the claimed spec and over longer distances fibre optics are more efficient and is easier to implement than copper as the copper/ethernet would be much larger and less flexible and would maintain better data rates over long distances.
Also very important to remember, dont use consumer APs, ubiquiti does really well here. Mikrotik has products too and there are other business vendors in this space. I would recommend ubiquiti for outdoor because even engenius outdoor stuff has poor quality(very high failure rate, especially if you have humidity and lightning) and mikrotik's wireless line is actually their buggiest product. If your router is going outdoor (even if going to be enclosed) you should also choose non consumer as it would be more reliable, option of POE and SFP and they are usually made to be used in tougher environments.
Evaluate the prices and choices.
There are APs or routers with SFP, good for bridging, routing, doing some sort of control and such.
There are media converters
So the cost is either using a media converter or SFP + the SFP module
If you are setting up a tower in the center and have multiple APs, you can get a POE switch with SFP so it makes powering everything easier and it would have built in SFP too.
Depending on whether you have any buildings that use wire on the inside you can either put your main router/modem with the tower or in the main building, really depends on your setup. If none of the buildings are using any wire connections inside for networking than your main router can be with the tower in which case you wont need SFP or media converters except for internet and you wont need to worry about a backbone over a larger distance.
While ethernet is rated up to 100meters there are cables that dont fit the claimed spec and over longer distances fibre optics are more efficient and is easier to implement than copper as the copper/ethernet would be much larger and less flexible and would maintain better data rates over long distances.
Also very important to remember, dont use consumer APs, ubiquiti does really well here. Mikrotik has products too and there are other business vendors in this space. I would recommend ubiquiti for outdoor because even engenius outdoor stuff has poor quality(very high failure rate, especially if you have humidity and lightning) and mikrotik's wireless line is actually their buggiest product. If your router is going outdoor (even if going to be enclosed) you should also choose non consumer as it would be more reliable, option of POE and SFP and they are usually made to be used in tougher environments.