single-mode SFP on one end with a multi-mode SFP on the other. Success meaning that the link came up. Once I realized my mistake, I swapped out the incorrect SFP so I don't know whether it would have ...
We thought it was a bad SFP on the Ciena until the AT&T tech showed up and tried a TP Link media converter, and that lit up instantly. I've used those Startech media converters at several sites ...
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