le of network Electrical core dimensioning. OXC (GLSR) [L] -011 = FIGURE 8.20 Physical topology, traffic matrix, and link [T] -011 lengths of the network considered in the example of dimensioning. In this normalized measurement unit, a wavelength, structured with the OTN frame, has capacity W 1. The last element that is needed to characterize the topology is the distance matrix [L], which is the matrix whose elements are the length of the physical links connecting the nodes. We are considering obviously physical length, which takes into account the real structure of the cable system and thus that can be used to design transmission systems. The value we will assume in our example for the normalized lengths of the links are reported in Figure 8.20. The traffic also, if it is a priori known, can be represented with the matrix [T] of the MPLS layer LSPs routing requests, whose value for our exercise is also reported near the network topology in Figure 8.20. To deploy equipment in an optimized way means to deploy the minimum cost network that can manage with the required reliability and QoS the given traffic. For the moment we do not consider QoS, even if this is in general an important point of the design. In order to minimize the cost, a cost model has to be done for all the equipment that is present in the network. We will choose a simple model, in line with the nature of this example: The cost of LSR will be proportional to the number of ports (A; will indicate the number of ports of the LSR in the node j, if Nj = 0 no router is present). The propor- tionality constant (unitary cost of one LSR port) will be indicated as XL. Convergent Network Management and Control Plane The cost of OXC will be proportional to the number of ports (Kj will indicate the number of ports of the OXC in the node j, if Ki = 0 no equipment is present since in the overlay model no LSR can be deployed without the transport layer switch). The proportionality constant (unitary cost of one OXC port) will be indicated with Xx. The cost of the W