Cisco 1841. DSL connection type: ADSL. Switching protocols: Ethernet, Data link protocols: Ethernet, Fast Ethernet, Management protocols: SNMP, Telnet. Flash memory: 32 MB, Internal memory: 128 MB. Power supply: 50 W, Input current: 1.5 A. Operating temperature range (T-T): 0 - 40 °C, Storage temperature range (T-T): -25 - 65 °C, Operating relative humidity range: 10 - 85 %