HSFP8528-SR SFP28 25G SR 850nm is a single-rate module with an operating range of 0.5m to 70m/100m over OM3/OM4 MMF (Table 1), respectively, compliant with IEEE802.3by 25GBASE-SR optical specs. 

The module optical connection is duplex LC and shall be compatible with SFP+ 28Gbps and backward compatible with legacy 10G SFP+ pluggable. The SFP28 SR module is a dual directional device with a transmitter and receiver plus a control management interface (2-wire interface) in the same physical package. 2-wire interface is used for serial ID, digital diagnostics and module control function.