CATV: Part 3
Power Supply
In addition to supplying power to nodes, power supplies are locations where AC current is injected, or inserted, onto the metallic coax cables of the CATV distribution system. Power supplies are typically installed every half mile in densely populated urban areas and every one to two miles in suburban areas. With the help of filters, coax cables can carry AC power without interfering with the audio and video signals they also transport (Figures 26-28). Power supplies are most often located at nodes or the beginning of trunk line legs.
Although not as robust as natural gas generators, power supplies can house batteries for back-up power during electrical outages. The DC current produced by the batteries is converted to AC inside the power supply so that the equipment downstream operates as normal (Figures 29-31). Power supplies report their condition back to the headend allowing the CATV operator to monitor its system.
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Power Supply
In addition to supplying power to nodes, power supplies are locations where AC current is injected, or inserted, onto the metallic coax cables of the CATV distribution system. Power supplies are typically installed every half mile in densely populated urban areas and every one to two miles in suburban areas. With the help of filters, coax cables can carry AC power without interfering with the audio and video signals they also transport (Figures 26-28). Power supplies are most often located at nodes or the beginning of trunk line legs.
Although not as robust as natural gas generators, power supplies can house batteries for back-up power during electrical outages. The DC current produced by the batteries is converted to AC inside the power supply so that the equipment downstream operates as normal (Figures 29-31). Power supplies report their condition back to the headend allowing the CATV operator to monitor its system.
