The T3DO-M is a time-division multiplexer designed to allow multiple users to access a single physical interface. It is one of the products in the Elatec range of communication monitoring and analysis instruments. The T3DO-M has a powerful graphical user interface, which allows users to set up, configure and monitor the operation of their communications links. The device can be used to analyse VoIP, PSTN, ISDN and ATM networks and includes a range of powerful tools such as protocol analysis, trace logging, script debugging and RTP/RTCP debugging. The T3DO-M also supports various monitoring features such as packet and bitrate monitoring, latency analysis, end-to-end traffic analysis, call and trunk monitoring. In addition, the T3DO-M is equipped with a variety of other features including software-defined radio, call recorder and call recorder playback, as well as protocol decoders for Ethernet, ATM, Frame Relay and Point-to-Point Protocol.