Item 18 - Measure M2 Funding Eligibility 2026-27 Renewal

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EXHIBIT 4 L D. Traffic Signal Communication The city currently uses a combination of twisted wire pair(TWP), Fiber Optics(FO), and wireless radios for field device communications. Most of the traffic signals communication is via the City underground hardwired interconnect network, and similarly, communication to CCTV cameras is via the City underground fiber-optic network. Where fiber-optic is not available,wireless or hardwire interconnect is used for CCTV cameras. The City plans to upgrade all communication to Fiber-optic as funding becomes available. The City traffic signal network is comprised of`network zones' configured in one or more daisy chain rings. These daisy chains create an interconnected network of all traffic signal and ITS devices , originating from the TMC,which provides network redundancy and IP network segmentation. Each zone is supported by a Layer 3 Ethernet switch providing the network routing for devices on that ring. In addition, each traffic signal is supported with Layer 2 fiber optic switches enabling a link to the TMC. This traffic signal network provides a high-speed, high-bandwidth, and secure connection from the TMC to the ITS elements. Furthermore, Santa Ana employs a Network Performance Monitor(NPM)software for network management and monitoring which allows City staff to quickly and remotely troubleshoot network and communication issues. E. Traffic Signal Synchronization The traffic signals on the designated arterials in the LSSP are inventoried and listed in Table 2 (Traffic Synchronization Inventory).The table identifies all intersections for each arterial, associated controller type and firmware, detailed synchronization data such as cycle length of each synchronized period and Intelligent Transportation Systems (ITS)equipment. Synchronization periods include AM, Mid-day, PM and Weekend. SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN I 9