10-14-13 Regular Meeting of La Porte City Council

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2.4GHz M1020M1010 VehicleRadio ModuleUnit Ethernet M764 PhaseSiemens Controller Selector The M1020 vehicle unit broadcasts its identity, GPS location, heading and speed three times every second to the M1010 radio unit at the intersection. The list of detected vehicles is transferred to the M764 phase selector for evaluation. Using pre-programmed criteria, the phase selector determines the approach channel and distance to the intersection. Using the reported vehicle speed, the ETA to the intersection is then calculated. Again using pre-programmed criteria, the proximity is evaluated using both the distance and the ETA against a list of thresholds for the approach on which the vehicle is travelling. The vehicle priority level (high for EVP and low for TSP) is used to identify the appropriate threshold. If the vehicle has reached one of these thresholds then a detector input is reported to the controller. Centralized Authentication, Data Collection and Reporting GTTs Central Management Software (CMS) in its current configuration communicates with the phase selector at the intersection to monitor preemption status, provide remote access for operational maintenance and provisioning and extraction of call records from the phase selector’s activity log. The current method of monitoring is via polling of the phase selectors for status. Both batch processing via scheduled jobs and live access via a graphical user interface are available in the product. Authentication is currently accomplished in the system via means of security coding that uses the agency, class and ID of the vehicle unit as a key to access preemption and priority services at the intersection. Coding is available as static lists of code ranges that allow up to 5000 code ranges to be specified and via scheduled time plans that allow smaller sets of ranges to be specified for access during specific times during the day. Up to 100 additional code ranges may be specified using this method. The preferred medium for communication is via a TCP/IP network. CMS uses an efficient proprietary communications protocol to communicate with the phase selectors. City of La Porte EMS will install a communications network for intersection to intersection connectivity for CMS usage and reporting for Houston Tran Star.