Cisco ATM NETWORK MODULE. Networking features: E3 ATM. Cable type: 75 Ohm BNC type connector. Minimum system requirements: • DS3 and E3 ATM network modules are supported in all 2600 Series, 3620, 3640, and 3660 platforms. Dimensions (WxDxH): 39 x 180 x 182 mm. Operating temperature range (T-T): 5 - 55 °C, Storage temperature range (T-T): -25 - 70 °C, Operating relative humidity range: 0 - 90 %