64-QAM Digitalization of an Analogue Microwave Radio Network

With the emergence of new high capacity digital services, new modern digital networks are necessary to satisfy customer applications. However, the task is to provide digital connectivity that gives the best performance at the least cost. One way is accomplish this is to retain as much analogue equipment as possible. The TD-90 system, described here, utilizes existing long distance analogue microwave radio and economically converts it to high performance, high capacity, digital radio by application of innovative technology and careful route planning.