bids are invited for tdm over ip ( q3 ) -overview the 4e1 tdm over ethernet ( ip ) converter is mainly used for transmitting e1 signals over ip network. it allows operators and enterprises to seamlessly and reliably connect tdm equipment and user ethernet over a standardized, low-cost wireless or wired ethernet / ip infrastructure, without any impact on the quality of service. tdm over ip is transparent to tdm signals and ensures the seamless connection of any device with a physical e1 interface, such as pbx, mobile base station, ss7 signaling equipment, and voice mail system. it can be used in ip-based communication systems, including lan, wan, man, and wireless networks. the device has 4 e1 service ports, 2 10 / 100 / 1000m ethernet ports, a 100 / 1000m adaptive sfp optical port, and a console management interface. photo total quantity : 2