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Nowadays it is typical for large cities that IP and cellular network traffic is dramatically growing all the time. At the same time, it is extremely expensive or sometimes even impossible to add new optical fiber links (due to municipal regulation, lack of space, required construction and installation time, etc.) that would resolve the network overload problem. Currently there are two main approaches to the problem. The first addresses the problem from a low-level and looks for new wireless link technologies that are easily deployed in metropolitan areas instead of fixed fiber lines. The second approach addresses the problem by applying high level network management that allows efficient distribution of load in the network, avoiding link congestion and maximizing use of all available physical resources. This paper discusses wired and wireless networks with need of more capacity, where utilizing point-to-point microwave radio links is cost-efficient. Moreover, it defines a new link-extension framework that combines both approaches and is based on the new flexible Microwave Gigabit Radio Link solution extended by a network-level link management system. The proposed link management scheme maximizes use of physical resources by dynamically adjusting link capacity to the current network need, while taking into account physical conditions of the line and minimizing usage of bandwidth and power.