Brand: Nokia Part Number: CS73671.28 Form Type: QSFP28 Speed: 100GBase Reach: 50m Wavelength: 850NM Transceiver Type: SR4 (52P)RTXM420-550-C76 Connector: Duplex LC Media: MMF DOM: Support Speed Description: 100-Gigabit Environment: 0 to 70C Country of origin: CHINA In addition to Nokia CS73671.28 , Liyuan Tech supply a wide range of other Nokia transceivers. If you have any need or interest, please feel free to send inquiry to global@chn-liyuan.com