Issue link: https://www.e-digitaleditions.com/i/1327492
16 I ICT TODAY To meet CEREMA's goals, budget, and environ- mental priorities, the ICT integrator collaborated with manufacturers and added value distributors to develop a turnkey solution that effectively reused the company's infrastructure to improve network speed, while mini- mizing physical building disruption for employees and visitors. The ability to integrate multiple technologies and product components was key to the project's deployment. Product components included: • Class B+ GPON SFP transceivers compliant with ITU-T G.984.2 standard in the OLT and ONT active layer. • OLT supporting 4 to 16 PON ports, 1 to 4 10G, and dual 48 V power feeds for redundant power supply. • ONTs-24 ports. • MM/SM modal splitter in 1RU 19" rack with MMF on the rear panel to be brought into the existing patch panel to perform fusion splicing on the MMF. See Figure 9. by the modal splitter and perfect center launching modal adapter, which saved time and budget dollars through repurposing CEREMA's cables. In the first phase of the project, the modal splitter was deployed in the IDF at the end of the MMF link, while the modal adapter and OLT were installed in the MDF. The multimode fiber link was thus encapsulated between two modal adapter equipment allowing modal adaptation with the surrounding singlemode equipment. To clarify, the modal adapters were installed at both ends of the MMF to convert the MMF links into SMF. The active layer was connected to the upgraded MMF link through singlemode patch cords. By using 24-port ONTs just at the outputs of the modal splitter, the existing riser Cat 6A balanced twisted-pair cabling could be reused without any rewiring required. There was minimal disruption and near immediate improvement. In a few hours, all active and passive equipment were installed, and all offices had high bit rates access. This allowed a network operation phase to be maintained with minimal impact on the site's services. After a few months of phase 1 operation, phase 2 began in order to enable the deployment of SMF cables in the riser ducts to replace the existing copper cabling and to bring the 4-port ONTs closer to the end users. The SMF riser links were connected to the modal splitter and to the remote ONT terminals to complete the POL architecture and project. CEREMA's completed optical cabling POL architecture is eco-friendly, future-proof, and ready for a transition to XGPON in the future. FIGURE 10: Compact perfect center launching modal adapter to be installed on the OLT side at the beginning of the multimode link. FIGURE 9: Multimode to singlemode modal splitter 2x16. • MPLC-enabled remote perfect center launching modal adapter, which is a compact form factor inserted into the remote existing MMF optical drawer in order to carry out the splicing process. The drawer is then closed and the existing patch panel is connected to the active equipment via an SMF patch cord. See Figure 10. A mastery of POL equipment and modal adaptation for MMF refurbishing allowed for a high bandwidth network laid over the existing OM3 links facilitated