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Typical heat dissipation: 126.07 BTU/hour, Maximum heat dissipation: 151.15 BTU/hour, MTTR: 2 hours, Availability: > 0.99999, Noise at normal temperature (acoustic power): 46.6 dB(A), Noise at normal temperature (acoustic pressure): 34.6 dB(A), Number of fans modules: 1, Long-term operating temperature: - 5 Degree C to 50 Degree C at an altitude of 0 -1800m (0-5906 ft.), Restriction on the operating temperature variation rate: When the altitude is 1800 - 5000 m (5906-16404 ft.), the highest operating temperature reduces by 1 Degree C every time the altitude increases by 220 m (722 ft.), Devices cannot start when the temperature is lower than 0 Degree C. The operating temperature ranges from - 5 degree C to +45 Degreee C when optical modules with transmission distances greater than or equal to 60 km are used. The device does not support dying gasp when the ambient temperature is higher than 40 Degree C, Storage temperature: -40 Degree C to 70 Degree C, Long-term operating relative humidity: 5% RH to 95% RH (non-condensing), Long-term operating altitude: 0 - 5000 m (0 - 16404 ft.), Storage altitude: 0 - 5000 m (0 - 16404 ft.), Power supply mode: AC built-in, Rated input voltage: AC input: 100 - 240 V AC; 50/60 Hz, Input voltage range: AC input: 90 V AC to 290 V AC; 45 Hz to 65 Hz, Maximum input current: 1.6 A, Flash memory: Physical space: 1 GB, Console port: RJ45, Service port surge protection: Common mode: -+7 kV, Power supply surge protection: Differential mode: -+6 kV; common mode: -+6 kV, Ingress protection level (dustproof/waterproof): IP20, Types of fans: Built-in, Heat dissipation mode: Air cooling for heat dissipation, intelligent fan speed adjustment, Airflow direction: Air intake from left and air exhaust from right, Certification: EMC certification, Safety certification, Manufacturing certification