(a) Consider that the Semiconductor company plan to deploy Wide Area Network (WAN) core optical network infrastructure and Cloud Services (Data Centres) in which organization operation are throughout the branches. Table 1 shown the Nodes and Data Centres for company with data rates of 100Gbps is being setup for each links networks. Suppose Servers at Data Centre are connected to Disaster Recovery Data Centre (DRC) via optical networks for restoration and backup purposes. Assume a 10dB power margin for losses in connectors. (i) Construct and illustrate the optical networks infrastructure connectivity in Mesh topology by providing the nodes with Core Router, Optical Cross-connect / WDM as in Table 1. (ii) Evaluate the maximum length of the optical link from ingress to egress, assuming that there are no amplifiers. (iii)If the link operates at a rate of 50Gbps and an average dispersion limit of 1250 Gbpskm. Rate the maximum length of the optical links from ingress to egress. TABLE 1