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EXHIBIT 4 <br /> III.Traffic Signal Infrastructures and <br /> Synchronization Inventory <br /> A. Traffic Management Center (TMC) <br /> The TMC provides City staff with a centralized <br /> command and control of all city traffic signals. It <br /> wo supports all current and future ITS field devices and <br /> technologies. It is a central housing for all traffic signal <br /> systems, communication hardware, and traffic signal <br /> video/monitoring systems. <br /> The City has a Main TMC located at the City Hall <br /> Building, 20 Civic Center Plaza, Santa Ana, CA 92701, <br /> shown in Image 1. There is also a Remote TMC <br /> �® located with the same address in the adjacent Ross <br /> Annex Building, shown in Image 2. <br /> _ As part of the upcoming Bristol RTSSP,the City plans to <br /> relocate the existing Main TMC facility and systems into <br /> the Ross Annex Building. This will allow the city to <br /> decommission the existing Remote TMC(RTMC)and <br /> centralize its traffic operations and related systems within <br /> a new Main TMC. The new Main TMC is to be relocated <br /> to the same floor space and operations area as all traffic <br /> engineering personnel. <br /> As part of the TMC relocation, the City anticipates <br /> — relocating the existing servers to new server racks, <br /> relocating existing workstations and procuring new <br /> workstations, implementing a new video wall, and <br /> n reterminating the City's fiber optic cable at the new <br /> TMC. Additionally, the City will refresh their existing <br /> Centracs licensing for an additional three years. The <br /> City of Santa Ana uses Econolite Centracs Central <br /> Advanced Transportation Management System <br /> + r (ATMS). Centracs is used to facilitate the operation of <br /> the existing traffic control system via the existing <br /> communication infrastructure. <br /> The existing TMC systems communicate to the entire <br /> traffic network through seventeen (17)separate fiber <br /> optic legs. Each cable is terminated on 1 of 3 FDUs <br /> (Fiber Distribution Units) housed in the TMC server <br /> racks. These (17)communication legs are all landed on <br /> a Layer 3 Ethernet Switch which acts as the central <br /> gateway on the network. An image of the TMC <br /> equipment room is shown in Image 3. <br /> SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN I 6 <br />