https://www.optical-sintai.com/products/otu-transponder/ The OTU Transponder includes 1x100G into 1x100G transponder (CFP2, CFP), 4x25G into 4x25G transponder, 4/5x10G into 4/5x10G transponder and 4x2.5G into 4x2.5G transponder, which can be matched with OTNS 8600 I/II/V series of 1U, 2U and 5U chassis.