So let's look at a simple example. we have a core router you know border router core router and uh your central switch for the servers in your central location this is where you're running your cable from your core location to and we're gonna run it to four different buildings you can see the total distance here is 1400 meters or 1.4 kilometers and you can see it's going to require eight optical interfaces it requires an optical interface in the core router and it requires an optical interface in the remote building so let's just do a really quick look at what would it cost and again this doesn't include the cost of the router or switches that support this these speeds it's looking only at the cost of the optical interface and the fiber itself so if we built that network with OM1 it's 1.4 kilometers times the per kilometer cost of 49.21 so we get you know 1.4 times 4921 is 68.89 now for the optics if you remember with the gigabit optics you can go on OM1 fiber 275 meters so we can use one of those links the one that is 200 meters i can use the cheaper optical interface the six dollar optical interface rather than the nine dollar optical interface but only for that one link that 200 meter link the rest of them i have to buy the more expensive optical interface at nine dollars each i need to buy six of those so you add that up two times six plus 6 times 9 and then you'll get the total cost of 69.55 doing the same for OM2 we note that OM2 will support gigabit for 500 meters which is the farthest uh any of these buildings are so we can use the less expensive optics so if we had one it's going to cost us 66 for the optics if it's OM2 we only need eight of the less expensive so 48 dollars and the fiber cable itself is cheaper so 1.4 times the the cost per kilometer and you come up with you know about 5 grand doing a similar with OM3 and OM4 you can see the cost of the optics is totally dwarfed dwarfed by the cost of the fiber cable so 014 we're going to spend 12 500 on the cable but only 50 bucks on the optics and then finally for os2 even though it requires all of the more expensive interfaces the cost of the fiber is so much cheaper it's thirteen hundred dollars and you add the cost of the more expensive optical interfaces you get installed system much much much less cost than any other choice if we move to 10 gig so if we move to 10 gig note that some of these fiber types won't support 10 gig over the required distances right so om1 om2 and om3 can't build this network because om1 and lm2 won't do 10 gig farther than 220 meters om3 won't do 10 gig farther than 300 meters so if you installed that fiber and we're trying to build that type of fiber and try to build this network you couldn't actually do this OM4 will absolutely do this it takes eight of the less expensive interfaces at 144 dollars so you can still see you know it's around thirteen thousand dollars for the optics and for the uh fiber cable again not including the cost of the switch or the router with single mode fiber again since the cost of the fiber is so much less even though the optical interfaces cost more the installed system cost is very very uh much better than using OM4 fiber and then if we move on and just take a look at 100 gigs you can see that none of the multi-mode of fiber cable types none of the OM fiber types will support 100 gig over any of the required distances single mode absolutely will now here the single mode interfaces are dramatically more expensive they're six times more than the multi-mode interface for 100 gig but at least you can build the network here we have the optics starting to dominate the cost so you know it's the only thing that will work.

© Produced by Philip Smith and the Network Startup Resource Center, through the University of Oregon.

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