ZyXEL Omni.Net Lite ISDN TA. Networking features: Dynamic Bandwidth Allocation, BACP & BAP (Multilink PPP), PAP & CHAP, ISP Server. Modem speed: 230.4 Kbit/s, Interface type: ISDN S/T. Minimum system requirements: PPP/MLPPP 1 x RS232. Operating relative humidity range: 5 - 90 %, Operating temperature range (T-T): 0 - 40 °C. Dimensions (WxDxH): 129 x 180 x 35 mm