The PCS125MT221 is a modular transceiver from Viking Electronics, a company specializing in telecommunication equipment. This device is a Phase Carrier System (PCS) that combines a three-line audio, data, and control system over a single copper pair. It is specially designed for voice and fax applications with enhanced supervisory control and progressive TDM protocol support. It supports a 120VAC, 16A, 50/60Hz single phase input. The transceiver has an IP66-rated enclosure to protect the internal components from moisture, dust, and extreme temperatures. It also features noise cancellation, echo cancellation, and advanced network synchronization capabilities. The transceiver is compliant with United States and Canadian UL and CSAC regulations.