So you want to connect A to C but there is no direct link from A to C, however, there is a link from A to B and B to C. NOTE: I'm going to presume that the links are all of the save wavelength, either SM or MM (and not both. So you'll just need to find a fibre optic patch cord of the right length and terminating ends (LC, SC, ST or MTRJ) and patch the links in.
SM optics have a range of 10 km and it sounds like you are in a campus environment not going anywhere near that. The loss should be negligible assuming fibers and connection points are clean and sound.
You should be able to any length you want for the fiber patch cable. There are pre-made lengths that afre probablt trhe better way to go, but you should have no problem just looking online.
The fact that you are patching through building B should have no affect on the error rate. If the fiber infrastucture is sound it should be clean and error free.
Typically SM = yellow patch cable. (MM = orange) I know I can order 1 m, not sure about .5 m legnth. You'll want to verify if all patching uses LC to LC, or what specifically you are using. If SM fiber throughout you won't need a device to change over from SM to MM.
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