Hello, I am new to networking and dealing with fiber.   I got nervous when I saw mention of upstream fiber.   If I have multimode fiber as my uplink at a MS250 switch and have a couple of multimode fibers on SFP ports coming out of it, but I want to add one single mode on another one am I going to run into problems?   I have a scenario where I have some good distance to another building and I had requested single mode be pulled. 
						
					
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