The DTS 14A device is a telephone system converter that can convert a two-wire system to a four-wire system (E&M) or vice versa. By using advanced digital circuits and the accurate design of the analog system, the sound quality is well maintained in this product. This equipment is offered in two single-circuit models (Standalone) with the ability to be installed on a rail and a Rack mount model that includes 18 DTS cards. The single-circuit model is used for electrical substations and the rack mount model is used for dispatching centers.