So let's wrap up and have a final clip that we talk about our recommendations and give some strategies for installing fiber on your campus. So obviously based on what you've heard me talk about about multi-mode fiber and single mode fiber, don't install any multi mode at all. Never install multi-mode you're going to only install single mode fiber and you're going to run this single mode fiber in a star or a hub and spoke configuration from the core network to individual buildings we will also run fiber cabling in a star configuration or hub and spoke inside a building from the main network rack to every other network rack one of the things i wanted to point out is you won't actually the fiber cables won't actually tend to be in a star configuration simply because you're not going to run a separate fiber run from your core location out to each individual building in a different path and we will talk about this in future talks but often you will have a duct bank a bank of pipes that are in the ground all of the fiber cabling will go in this single duct bank so even though it potentially is a star configuration you you know often the the fiber cables will all follow the same path now this is something you need to think about as you start to use your network and it becomes mission critical is you don't want a single cut if all the fiber cable runs in a set of pipes and somebody comes and digs up those pipes and breaks them that's broken your entire network so you need to think from a redundancy perspective and a future proofing perspective that at some point you're going to want to have two paths to each individual building so that a single fiber cable cut doesn't sever your network so one of the tricks here is to reduce costs you can run a large fiber cable so a fiber cable that has 144 fibers this case we actually ran some fiber cables with 288 fiber strands in them and then splice onto that large cable and run smaller cables to the surrounding buildings where that cable in so here's a quick example so again this is planning for the future if we get money to serve one building say there's a really important uh physics uh faculty in a building and they really really need some network and so you get finances to dig a trench and put pipe in the ground and pull fiber cable to that building look towards the future and think about what else is happening if you run a fiber cable from the core location to this building to be served and you notice there's three buildings adjacent if your goal is to have six single mode fiber cables from your core location to each building rather than running a six fiber cable what we can do is we can run a 24 fiber cable and then we have enough fibers to provide six fibers to each of those buildings when we get enough money to extend the fiber on those fiber cables could be installed and terminated in patch panels at all these locations or you can actually physically splice the six fibers out of the 24 fiber cable onto the six fiber cable that goes to one of the remote buildings and notice that you're gonna look at me and say wait wait wait you said we can't daisy chain that's daisy chaining and in a sense you're right if i cut that 20 4 strand cable it's going to knock out all of the served buildings so we'll absolutely knock out all of the served buildings however if there's a network problem in the building that served with the 24 strand fiber cable it's not going to affect anything that happens to the other buildings simply because the fiber cables are joined together so you could lose power in that building you could have a big broadcast storm in that building you could have a huge virus go happening in that building doesn't affect the other buildings because uh they have their own dedicated fibers from the core network location so putting this all together i'm showing the core network location i'm showing in building one that we've run a larger fiber cable to the rack and then fiber cables to adjacent buildings as well as fiber cables to additional network racks inside the building. And then we put this all together. Here we have our recommended OS2 fiber cable going everywhere and we have Category 6 cabling serving the station outlets that are pulled off the network racks.

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

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