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The GCP 5000 can have up to 6 Track Modules for train detection, with each Track Module having nine track predictors that are configurable as motion sensors or predictors. The Track Module Prime Predictor is generally used for control of local crossings. The Track Module DAX A through DAX G Predictors are generally used for control of remote crossings. The Track Module Preempt Predictor is generally used for interconnection with traffic signal systems. Each Track Module has two vital inputs and two vital outputs. In addition to predictors, each track module is capable of providing multiple frequency island circuit. Using internal crossing controller(s), the GCP can control the bells and gates of a crossing and up to 40 amps of lights. Each SSCC IIIi module has 5 vital outputs. The GCP can utilize internal PSO Modules that have the ability to detect train direction on a bidirectional track circuit that allows the control of remote crossings (DAXing). Each PSO Module has three vital outputs and two vital inputs. The GCP can utilize RIO modules to extend I/O capability via the RIO's four vital inputs and four vital outputs. The GCP has redundant Main/Standby operation for CPU, Track, PSO, and RIO modules. The GCP can perform independent event recording, using the SEARIIi. The SEARIIi options include programmable alarms and automated performance of crossing test functions. The GCP also interfaces to the Wayside Alarm Management System (WAMS).The GCP utilizes Echelon communications for vital communications to other locations via Ethernet spread spectrum radio (ESSR) and single person calibration and monitoring using VHF communicator. The GCP has a color display module for configuration, monitoring and troubleshooting the system.