Eugene Master Traffic Communications Plan

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2. EXISTING COMMUNICATIONS INFRASTRUCTURE This section includes an overview of the existing communications infrastructure managed by the City of Eugene's Public Works Department to support their traffic signal system and other traffic devices. It also includes a description of the communications infrastructures of other departments within the City and other agencies that may provide opportunities for sharing resources with Public Works. 2.1 Existing City Public Works Communications Infrastructure The City of Eugene has an extensive network of twisted pair copper plant utilized for traffic signal interconnect to 195 (85 percent) of the City's 230 traffic signals as shown in Figure 2. The twisted pair copper also provides communications to four closed- circuit television (CCTV) cameras on Coburg Road on the Ferry Street Bridge and five block controllers used for the Emerald Express (EmX) transit system. The twisted pair copper interconnect terminates at one of two hubs as depicted in Figure 3: 1. 1820 Roosevelt Boulevard: The QuicNet 2006 central signal system server is housed upstairs at the Public Works Maintenance facility on Roosevelt Boulevard. One twisted pair copper interconnect cable, which serves 31 traffic signals, four CCTV cameras, and the 7' Avenue /Jefferson Street video detection cameras, terminates in modem racks downstairs at the Public Works Maintenance facility. The traffic signal modems support serial (RS -232) data communications to the field. The modem racks interface to a 16- channel Etherlite® network serial concentrator, which interfaces with the City's network and ultimately with the central signal system server located upstairs. 2. 858 Pearl Street: The central signal system server was previously located on Pearl Street prior to being moved to the Roosevelt facility. Nine twisted pair copper interconnect cables, which serve 169 traffic signals, terminate in modem racks on the third floor of the 858 Pearl Street building. The modem racks interface to a 32- channel EtherLite@ network serial concentrator, which is connected to the City of Eugene Ethernet network infrastructure and allows the use of the City's fiber optic network to provide a connection between 858 Pearl Street and the central signal system server at Roosevelt. All 32 channels of the EtherLite@ concentrator are currently in use. The twisted pair copper cables are typically gel - filled with either 12 or 25 pairs of wires and much of the cable has been in the field for 20 or more years. Table 3 includes a description of the homerun cables at the Pearl and Roosevelt hubs while Appendix B includes detailed maps of the cable routing and the wire pairs assigned to traffic signals, cameras, or other functions (e.g. advance emergency preemption or bus priority). Often, 12 -pair or 6 -pair cables branch off from the main 25 -pair or 12 -pair cable to pick up traffic signals along streets adjacent to the route of the main cable. The majority of the twisted pair copper cables are installed underground but a significant amount are also installed overhead as depicted in Figure 2. The underground interconnect is installed in conduits ranging in size from one - and -one quarter to three inches, with two inches being the most common size. The conduit may typically be accessed in Type 2 junction boxes (JB -2s) that are 22" x 12" x 12" and located approximately every 200 feet. Overhead interconnect is typically attached to wood utility poles owned by the Eugene Water and Electric Board (EWEB). Public Works currently performs all of the maintenance for their twisted pair copper interconnect system. DKS Associates Eugene Master Traffic Communications Plan March 2008 ' Page 7