The longwave 1G SFP's were certified independently to work with 2.1.2 and above. But the overall solution has not been certified. The 4G LW SFP's that are supported with 3.x are on the list to be certified. If you need this, I would contact the Cisco sales team to create a business case for it. Up to now, noone has presented a biz case for how much LW is needed for the 9020
