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“Links” is a UPB term to describe a channel of communications linking transmitters and receivers in a lighting system. A link essentially represents a scene. A transmitter sends a “link command” over the powerline, which contains a “link number” from 1 to 250. Receivers within the network domain are programmed to listen for and act upon certain link numbers. Receivers can take different actions (i.e. dim a light to a certain level at a certain rate, turn the light on or off, etc.) depending on the link number received. Because of the “link” structure of UPB, one powerline command can affect up to 250 devices simultaneously.
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