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Re: CWDM equipment (current favorites) (fwd)
Since we are clarifying...As there's no specification for 2.5 gigabit ethernet (that I'm aware of), and SONET gear with pluggable optics is likely out of your league, I'm afraid that's a decision you'll have to make. :-) There are plenty affordable options available 1U for switches with 10GE uplink ports. I've had good luck with the Extreme Summit x450. If you're a bit more daring, Allied Telesyn recently announced a switch with a similar port density, though lacking in the useful "bunch of SFPs rather than 10/100/1000 ports" configuration. More and more, I'm finding it difficult to justify deploying n x GE port-channels across dark fiber, when 10GE is a lot easier to scale and troubleshoot...
Yes, 10G is a nice option when you can use reasonably priced optics (<80km). CWDM (nx2.5 or nx1G) works happily up to 30+db of loss and reduces complexity if you can avoid all the associated pieces of DWDM you may need to address conditions in the long reach end of the range.