The ACI 757 Voice Communications and Control System (VCCS) is a solid state, modular, and flexible system which has provided reliable ATC communications for over twenty years. The basic premise of the design is to provide the Air Traffic Controller with a functional system tailored to his needs. The system provides the controller with single button selection of radio channels for transmit and receive. It also provides 'monitor only' as well as headset and/or microphone loudspeaker functions. Use of intercoms, hot line, and airport telephone access are also part of the system. Channel selected and channel in use are readily visible day and night. Interposition lockout is available to prevent two operators inadvertently using the same radio channel at the same time. Incoming RF signals are visually and audibly apparent with the frequency displayed.

The following is a list of the 757VCCS sub-systems.

• Radio Channel Control
• Intercommunications
• Telephone
• Crash Alarm & Control
• Clock
• Test Unit
• Power Supply
• Meteorological

ACI MODEL 757 MD VCCS: MICROPROCESSOR CONTROLLED VCCS
 

The 757 MD, a microprocessor controlled voice communication control sub-system (VCCS) integrates the radio, the telephone circuits, the intercom circuits, the hotline circuits, the PABX and switched public network circuits to provide a fully integrated voice communications system. The parameters and configurations can be custom tailored in the field, via the electronic technician's system monitoring and control console, to the customer's needs and requirements.

The VCCS is modular and easily expandable. Plug-in modules are used to facilitate maintenance and replacement of modules. The VCCS consists mainly of four parts: position electronics, a central electronics, remote intercom units, and an electronic technician's system monitoring and control console.

The VCCS relies heavily on the distributed processing approach. Micro controllers in different cards and modules relieve the main 32 bit microprocessor in the central electronics unit from repetitive tasks. Each microprocessor circuit has built-in self test facilities

The 757MD Air Traffic Communications Control System integrates various sub-systems necessary to provide the operators with access to all the required communication links and to enable the operators to monitor the system status.

The 757MD Radio Channel Control Sub-System provides the operator with the controls to select, transmit and receive (monitor) all radio channels available to the position. Selection of channels is by pushbutton; PTT is by microphone, headset or foot switch. Audio to module the transmitters is by hand microphone or by headset. Monitoring is by headset or loudspeaker. To enable the operator to conduct his/her work efficiently the system is equipped with indicator lights, warning lights, buzzers, and the means of eliminating inadvertent interference by other operators.

The 757MD Intercom/Telephone Sub-system provides the air traffic control operator with the means of communicating directly with other parties through operating pushbuttons and other controls on the console. Telephone communication is by headset or handset. (Other system configurations are possible.)