ZyXEL SFP-BX1550-20 100Base bi-directional SFP (Mini-GBIC) Module. Data transfer rate (max): 125 Mbit/s. Operating temperature range (T-T): 0 - 70 °C, Storage temperature range (T-T): -40 - 85 °C, Operating relative humidity range: 5 - 95 %. Certification: 21 CFR 1040.10 & 1040.11 CSA TUV. Compliance industry standards: IEEE 802.3ah