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Network controller is the core of Praesideo system. It can transmit up to 28 audio channels simultaneously to power the system, report faults and control the system. Audio input can be a broadcast, background music, or local audio from a call station. Network controllers can be configured to suit the most complex public broadcast systems. The configuration can be easily and efficiently completed with a PC. A PC is required only for configuration purposes. When configured, the controller can disconnect the PC and run independently. However, with the accompanying software, the controller can use PC to display system status information. The device can be used independently on the desktop or in a 19-inch cabinet. PRS - NCO3 network controller requires PRS - SW software version 4.0 or higher. The basic function connection option network controller has four analog audio inputs. Two of these can be switched between microphone input and line input. The other two are fixed for line input. Microphone/line input can be used as call input in conjunction with any of the eight programming Settings that control input. These control inputs can be specified at will for various system operations and are free to choose priorities. Line input provides an optional 20 kHz pilot tone detection for cable monitoring. The controller has 4 analog audio line outputs, each with an optional 20 kHz monitoring signal. Three of these control outputs can be specified for failure or call, while the other two can be used to connect visual and sound fault indicators. Currently available with 24 Vdc auxiliary outputs that can be used to power external visual failures and/or emergency lighthouses. Operation and performance of the user can through the PC with the attached software to fully configured network controller, and the PC can also provide the current state of the running system information and appropriate and effective configuration. In addition, after the configuration is complete, the controller can disconnect the PC and run independently. The front panel is equipped with a 2 x 16 character LCD display and knobs for viewing menus and selecting menu items. Use the display and knob to complete the address, version, failure events, and monitoring queries. The network controller can control up to 60 nodes. These nodes include devices such as power amplifiers, audio amplifiers, call stations, call station kits, and so on. In order to meet the requirement of emergency speech system, the network controller provides the function of automatically releasing information. The controller has a built-in removable CF card with installation capacity that meets the requirements of audio information storage. The system can play 4 messages at the same time. The system monitors information storage and information itself. Users can use a computer and download audio information (a set of wav files) via a Ethernet link. In addition, the controller can store multiple prompt, test and alarm sounds, all of which can be accessed through any call station or control input for broadcast or alarm broadcast. The network controller has a built-in buzzer, which can be used to notify faults or emergencies. The internal real-time clock allows you to schedule events, such as playing scheduled broadcasts or changing the background music volume at night. The controller has a variety of audio processing functions for audio input and audio output. Users can use configuration software to easily adjust parameter equalization, amplitude limiter and gain. There is also a headphone jack for monitoring audio channels. The security network controller supports redundant network wiring. It can be wired either as a branch network or as a redundant loop. The system can handle 256 call priorities for hundreds of areas and even meet the most complex public broadcast and emergency alarm systems.