1000BASE 120km SM 1550nm SFP Optical transceiver OEM/ODM order available Compatible with Cisco FeaturesUp to 1.25Gb/s Data rate 1550nm DFB ... ASFP1G-120-S55-CD 1000BASE 120km SM 1550nm SFP, with DDM, 0 ~ +70 °C ASFP1G-120-S55-I 1000BASE 120km SM 1550nm SFP, without DDM, - ... 45~+85°C ASFP1G-120-S55-ID 1000BASE 120km SM 1550nm SFP, with DDM, - ...