The whole evening, all that was accomplished was this.
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It's the ends of two 30m fiber pairs, fished through an existing wall, into the basement via the attic, to the network 'closet'. One will run 1.25G for the main network, and the other will be a 10G drop to the FreeNAS box.
And this was all the leftover! (The aqua ones, not plugged in yet) That was close!
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Only problem is I long ago ran out of SFP ports in the switch. So could really use a 10G SFP+ switch, but they ain't cheap! There are plenty of PCIe slots in the FreeNAS box for more dual SFP+ NICs. Might be cheaper to drop an extra NIC in the FreeNAS box and bridge them. (Throughput and latency through bridged connections are pretty poor for the 10G in that box tho...) But, that's a problem for another night.