This study arose from the need for the perception that the telecommunications company OI had to meet the high demand of subscribers who called the company after the fixed telephone service interruption that happened when the fiber optic broke, causing performance decrease in the indicator. the company's unemployment and thus the need for a study and project to solve the problem indicated by the subscribers. This study took place in the northern zone of Manaus, where the replacement of PDH modems by SDH interconnected with ring topology was performed, allowing greater gain in service protection and equipment stability in the fixed telephone service in the study area. SDH is a unified, high-speed digital transmission system that provides greater capacity and efficiency in network management, as well as a considerable price reduction. The multiplexing process, because it is more flexible, makes this step much simpler than PDH, which requires equipment symmetry at all points of the network. An SDH signal can be inserted at a higher rate without going through intermediate stages (BERNAL FILHO, 2009). The paper described the advantages and disadvantages of using data transmission via SDH for enterprise. The methods employed were bibliographic and field research, with replacement of data via PDH by SDH. After replacement, the availability of services was improved, especially due to the remote management obtained. It was concluded that the ring configuration proved to be very efficient in this region due mainly to the infrastructure problems brought by the growth of this region.
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