Part 1: Using fiber to run a 1000 foot ethernet link
Using fiber to run a long ethernet link is not quite as simple as you make out but it's certainly not unreasonable to DIY.
A few things you have missed.
- Putting connectors on the end of fiber is a specialist job. If you don't want to involve any specialists then you need to buy pre-terminated fiber terminated with the right connectors.
- You should avoid sharp bends in the fiber, I would also suggest running a duct rather than direct burial even if the cable you buy is advertised as suitable for direct burial.
- The individual fibers breaking out of a fiber installation cable will have very little protection against damage (far less than a patchcord does). If you buy a pre-terminated cable it should come with a preattatched gland that you can use to attatch the sheath and reinforcement of the cable to something solid and then a cover that covers the breakout section during installation. The proffesional way to deal with this is to fix the cable to a patch panel and then use patchcords to connect to the media converters. For a single link that is IMO overkill but you should take reasonable steps to ensure that the individual fibers don't get disturbed.
- Multimode fiber comes in different grades. I would suggest getting the higest grade (OM4) to minimise the risk of problems.
- Media converters are often fixed speed and will not work at lower speeds. So if one or both of the devices at the ends of the fiber links only supports 100 Mbps then you should buy 100 Mbps media converters.
- Remember to cross transmit and receive between the two media converters. The general convention with duplex patchcords and couplers is that they are always crossed (so you get an odd number of crosses between the end devices) but your installation cable will likey have single connectors on it so you will have to thing about the crossing yourself.
Part 2: sharing an internet connection
From a technical point of view you can build an ethernet network that spans multiple houses, connect it all to a normal home/small buisness NAT router and it will work. The protocols have no idea if the endpoints are ithe same house or not. However there are a number of things to be aware of.
- You will all be on the same LAN. There are obvious security implications to this.
- Your cable provider's terms and conditions may prohibit such usage and they may disconnect you if found out
- You will be sharing a public IP address, if someone in your community abuses the connection it may be difficult to determine who did it and you may find yourself all banned from online services. If people need ports forwarded there may be arguments over who gets what port.
- There may be local laws that put some legal responsibility on you as an ISP which you may struggle to comply with.
- If someone runs a connection hogging program like bittorrent they may drag down the quality of internet service for everyone.
There are ways around some of these, for example you can put NAT routers behind the main NAT router to provide some isolation between lans (though at the cost of having two layers of NAT which can break some services). You may be able to buy a buisness package from your ISP that allows the first level LAN to have public IPs so each house has thir own public IP, getting a buisness package from the ISP may or may not also eliminate unfavorable terms and conditions. You can get traffic shaping routers to try and reduce the impact of the torrent traffic.
Part3: responses to comment
I was thinking of simply laying the cable on the ground - it's all forest - except burying it in PVC where it crosses the road.
Doesn't seem like a good idea to me, a cable running along the surface is at quite high damage risk.
If unable to terminate myself, that means when the cable gets damaged, we need a whole new cable.
Rejoining a broken cable outdoors is possible but it's not a DIY job.
I have no idea what you mean by crossing transmit and receive; do you mean I need two cables, with one end connected to transmit port and other to receive (on the two media converters), and vice versa on the other cable ?
Normal fiber equipment uses two fibers, one for each direction. You have to cross over transmit and receive ports between the two transcivers, the fiber world has no equivilent to the AUTO-MDIX you see in the twisted pair world.
With most common fiber connector types you have both single fiber connectors and duplex (paired) connectors. It is possible to insert two single connectors into a duplex connector.
Couplers and patchcords are usually duplex and crossed. So if you connect two transcivers with duplex couplers and patch cords you end up with an odd number of crosses and everything works.
Installation cables usually contain at least four fibers (it is considered good practice to put in at least a couple of spares, so there is little point in a 2 fiber cable). If you buy them pre-terminated it is most likely that each fiber will be terminated on a seperate single connector (it's easier for them to fit a protective cover over the connectors for pulling the cable that way, as an asside make sure any preterminated cable you buy has this). So you have to remember to cross them over yourself when connecting them up.