I was talking to an AT&T installer that was doing some fiber work for me today. And we extended his equipment on the internal LC MMF fiber panels that were already installed in the building. They are large 1/2" Light blue fiber cables. Everything worked as expected and it all came up.
He brought up that there is SMF or MMF for internal on-prem building installs. And you really shouldn't do SMF on MMF.. I've never seen a 850/1310/1510 destination on actual fiber.
I've always believed that MMF can handle SMF connections and it's on on the SFP's which one you are doing. Granted you can't run MMF on the older SMF fiber runs.
Is he right, or am I?
Edited: for clarity..
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