Hi, I believe nobody actually answered the original question: is there any tunable SFP module available. Notice the lack of a + in that statement. The datasheets for modules cited in this thread are all 10G modules with minimum speed of 8.5G. Nothing that will work at 1G. But correct me if I am wrong, the real reason this is not available is because tunable optics is so extremely expensive. It is expensive for 10G and would be insane for a 1G link. When will I be able to buy tunable optics with only a modest price premium? I would love to stock tunables... but it is just so expensive that it is much cheaper to have spare parts for many different wavelengths lying around. Only organisations where money is unlimited can afford to use this stuff just for the convenience! Regards, Baldur