M refers to the organized system and operations involved in maintaining, repairing, and optimizing network infrastructure directly at field sites. It plays a crucial role in ensuring continuous and reliable connectivity for telecommunication, data, and utility networks. Field maintenance teams are responsible for diagnosing faults, replacing damaged equipment, performing preventive maintenance, and upgrading hardware or software components. This network of skilled technicians and engineers works in coordination with centralized network operation centers to minimize downtime, enhance performance, and extend the lifespan of network assets. Effective field maintenance not only improves service quality and customer satisfaction but also ensures operational efficiency and cost control for organizations managing large-scale network infrastructures.