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City of Santa Ana <br />Signal <br />Local Si l Synchronization Plan <br />g Y <br />underground hardwired interconnect network, and similarly, communication to CCTV cameras <br />is via the City underground fiber-optic network. Where fiber-optic is not available, wireless or <br />hardwire interconnect is used for CCTV cameras. The City plans to upgrade all communication <br />to Fiber-optic as funding is available. <br />The City traffic signal network is comprised of 'network zones' configured in one or more daisy <br />chain rings which provides a redundant interconnection of all devices originating from the TMC. <br />The network redundancy and IP network segmentation provide multiple paths for <br />communication so that data can keep flowing even in the event of hardware malfunction. Each <br />zone is supported by a Layer 3 Ethernet switch providing the network routing for devices on <br />that ring. In addition, each traffic signal is supported with Layer 2 fiber optic switch completing <br />the link to the traffic management center. The traffic signal network provides a high speed, high <br />bandwidth and secure connection from the TMC to the ITS field elements. Furthermore, Santa <br />Ana employs a Network Performance Monitor (NPM) software for network management and <br />monitoring which allows City staff to quickly and remotely troubleshoot network and <br />communication issues. <br />Traffic Signal Synchronization <br />The traffic signals on the designated arterials in the LSSP are inventoried and listed in Table 2 <br />(Traffic Synchronization Inventory). The table identifies all intersections for each arterial, <br />associated controller type and firmware, detailed synchronization data such as cycle length of <br />each synchronized period and Intelligent Transportation Systems (ITS) equipment. <br />Synchronization periods include AM, Mid -day, PM and Weekend. <br />Page 12 2023 <br />