The HFC infrastructure in the Miravalle sector was evaluated to identify its limitations. The results showed that 78% of the nodes had a high load, which generated saturation and signal degradation, especially during peak hours. The maximum capacity of the system was 200 Mbps, which was insufficient to meet the projected demand of 500 Mbps per user in the next five years. In addition, attenuation problems were identified in sections greater than 500 m, with average losses of 8 dB, which affected the quality of the service. The design of the GPON network took these limitations into account, so an architecture with 1:8 optical splitters was used, allowing up to 8 users to be connected per NAP box. In addition, the coverage included 10 km of ITU-T G.652.D single-mode optical fiber, which presented low losses of 0.2 dB/km. To ensure optimal performance, a simulation was performed in OptiSystem, which yielded an SNR of 32 dB, a BER of less than 10−9 and a latency of 2 ms. After the network was implemented, operational tests were performed. The average speed reached 950 Mbps downstream and 800 Mbps upstream, i.e. 95% of the theoretical capacity. In addition, availability was 99.8% and connection losses remained at 0.45 dB. As a result, 94% of users perceived improvements in service speed and stability, which confirms the success of the migration to GPON.