The Málaga CPM, headquartered at the Secondary Substation, based its communications system primarily on radio. This equipment, manufactured by ENSA, along with other star-connected radios located at strategic points throughout the province, were the first to be adapted for continuous transmission. This, along with achieving a flat frequency response for data transmission, centered around 2800 Hz, was one of the major accomplishments resulting from the collaboration between our technicians and those of the supplying company.