Think about the lifetime you are expecting from this service going into the trench. Do you expect it to last several decades without being touched? Or maybe your site is dynamic and you know it probably only needs to last 10 years, or perhaps you know the site doesn't like to be touched so you need to get 30 years out of it. > Now the rest of our site is getting OM3 fiber for the buildings that actually need it both in capability and in distance. OM3 is fine for everything today. Typically I get customers to install OM4 these days. If it was me I would get a price on OM4 as well before making a final decision. OM4 is definately more expensive. If it was me, I would definately install more than one type of whatever circuit you run. Lets say 5 years from now you are getting some weird circuit problems - having a spare cable lets you switch between them for testing. Also their is nothing worse than when a cable fails (perhaps water ingress, perhaps a rodent, perhaps a tree root, etc) and you have to dig the whole lot up again. Having a spare to change over makes it so much easier. If there is enough money - I would drop a couple of fibres into the trench - and just don't bother terminating them (to save money). Just leave them coiled up at each end. Then if something changes into the future, they are ready to be used. Fibre itself is usually not that expensive. It's all the labour to fit them off, trench them, etc which makes up most of the cost. I understand your logic with a run that is only 54m. But I'm with @NolanHerring . I'd be dropping a 6 core OM4 fibre into the trench. The fibre will be good for decades to come. It wont be affected by lightening strikes, temperature or water ingress, and is likely to be supported by new network standards for several decades.
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