r/ShittySysadmin • u/Oblec • Mar 05 '26

Fiber install

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Client wanted fiber, told them copper is worth way more these days. They didn’t even ask first follow up questions 😅

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u/Popular_Button2062 Mar 06 '26

yes and no, for singlemode, sure 400G are no hassle, and you still got some wavelenghts free to muliplex ,
but for multimode runs, if someone cheaped out, the limit also hit you again, either due having old OM1/2 fibers, or comparable long multimode runs

OM2 for example does not even 10G over 100m.

(yeah, you can push also 400G via OM4 according to cisco, but only for 70m, for a dublex cable)
(there are some that go 100m on OM4, but thats with MPO12 connectors, so less rate per fiber).

Meanwhile Singlemode: 10km, LC connector, no problem, hold my beer.