- noun a device at the centre of a Token-Ring network which provides a logical star topology in which nodes are connected to the concentrator. Inside the device is a physical ring circuit that connects all the nodes together.
- A device, such as a multiplexer, which combines multiple communications channels or signals.
- A device which provides a communications path that links many lower-speed channels to one or more higher-speed channels. A benefit of this arrangement is that it accommodates multiple-user connectivity with a reduced amount of circuit use.
- A device which utilizes optical elements to increase the amount of light, especially sunlight, incident upon a photovoltaic cell or panel.
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