SCADA is an acronym which stands for Supervisory Control and Data Acquisition. It may be used for a variety of applications where work processes, voltages, load, alarms, fluid levels, wireless remote control or telemetry is required. This control may be one-way or two-way and may have tones or data of varied bandwidth based on the processes being monitored or controlled. A number of control schemes may be used, some proprietary.
SCADA at non-federal facilities typically takes place the following VHF frequencies:
Frequencies between 450 and 470 MHz can be used on a secondary basis. SCADA operations may also take place in the 72 to 76 MHz band, the 216 to 220 MHz band, on trunked radio system talkgroups, cellular, PCS or other wireless networks, and on frequencies regulated by Part 101, the Fixed Microwave Services rules. Note that this rule title is a misnomer. Part 101 also covers point to point frequencies which lie outside of what is generally accepted as microwave spectrum. SCADA at federal facilities is usually in the federal government bands.
SCADA operations which are limited to meteorology, flood warning, stream flow gauges, etc. take place on the Hydrological/Meterological Channels.
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