https://www.gearlinkoptic.com/products/sfp28-25g-1310nm-10km-ddm-lc-transceiver/ SYSP8A10D SFP28 lr transceivers, according to 25 Gigabit Small Form Factor Pluggable "SFP28"(25ge sfp28) Multi-Sourcing Agreement (MSA) SFF-8431 Rev.4.1 and SFF-8472 Rev. 12.1, are designed for use up to 25.78Gb/s data rate and up to 10km link length. They are compatible with SFF-8432.