400GBASE-DR4+ QSFP-DD SMF 1310nm 2km DDM Transceiver is 100% compatible with switches and routers made by most major OEMs like Adtran, Agema, Alcatel, Allied Telesis, Arista, Avago, Brocade, Calix, Check Point, Chelsio, Ciena, Cisco, Commercial, Data Cen