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II <br />' 3.3 Standard Intersection Node Bandwidth Allocation <br />' To determine bandwidth requirements, the standard intersection node configuration assumed <br />would consist of the equipment listed in Table 6. The bandwidth requirements are based on a <br />worst case scenario where the data sources listed in the table are assumed to be operating at <br />' maximum bandwidth at all times. DKS recommends designing the traffic communications <br />network to be capable of supporting the maximum possible bandwidth. <br />M Table 6. Standard Intersection Node Requirements <br />The bandwidth for video detection cameras varies from manufacturer to manufacturer and the desired <br />video quality. The existing video detection cameras may be transmitted at a 1.0 Mbps bandwidth. The <br />Public Works Department should evaluate their bandwidth needs when they expand their video detection <br />in the future. <br />t DKS Associates Eugene Master Traffic Communications Plan March 2008 <br />Page 18 <br />Approximate <br />Communication <br />Channel <br />Type <br />Description Maximum <br />Bandwidth <br />CCTV Camera <br />Video <br />One camera per node 6.0 Mbps <br />CCTV Camera Control <br />RS- 422/485 <br />One video data channel <br />9.6 kbps <br />Video Detection Cameras <br />RS -232 or Ethernet <br />Typically 4 to 6 video cameras per <br />1.0 Mbps <br />intersection.' <br />Traffic Signal Control <br />RS -232 or Ethernet <br />Up to six intersections per channel <br />56.0 kbps <br />Ramp Meter <br />RS -232 or Ethernet <br />Data from a single ramp meter <br />9.6 kbps <br />Emergency Preemption <br />RS -232 or Ethernet <br />Typically 2 discriminators <br />19.2 kbps <br />Transit Signal Priority <br />RS -232 or Ethernet <br />Shared with traffic signal controller <br />N/A <br />data <br />System Detector <br />RS -232 or Ethernet <br />Some controllers support dozens of <br />N/A <br />system detectors. Shared with <br />traffic signal controller data. <br />Dynamic Message Sign <br />RS -232 or Ethernet <br />Up to four signs per channel <br />9.6 kbps <br />Weather Station <br />RS -232 or Ethernet <br />19.2 kbps <br />Red -Light Enforcement <br />Typically operated by a private firm <br />Camera <br />Speed Enforcement <br />Typically operated by a private firm <br />Camera <br />TOTAL <br />1 7.1 Mbps <br />The bandwidth for video detection cameras varies from manufacturer to manufacturer and the desired <br />video quality. The existing video detection cameras may be transmitted at a 1.0 Mbps bandwidth. The <br />Public Works Department should evaluate their bandwidth needs when they expand their video detection <br />in the future. <br />t DKS Associates Eugene Master Traffic Communications Plan March 2008 <br />Page 18 <br />