The iConverter 4xT1/E1 MUX/M operates in a back-to-back configuration with one multiplexer at each end of the fiber transport link. The 4xT1/E1 MUX/M can be used in applications where services from legacy TDM equipment require transport across long distances that exceed the reach or capacity of copper. This includes applications such as T1/E1 extension mobile backhaul and building-to-building PBX connectivity making it ideal for Enterprise Telecom and Utility industries.