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Light sources are being competitive in the current market. Several types of these products have been widely used in the last two decades. They play a major role on the low voltage network as they produce and inject undesired noise onto the transmission lines of the PLC channel. This noise can be of a serious and negative effect when using the power line communications system to control the automatic...
This paper shows how Light Emitting Diode (LED) Tubes negatively influence the data rate throughput of an indoor broadband Power Line Communications (PLC) channel. This negative influence on the data rate is due to noise being generated by the lamps. Differential Mode measurements were done with two PLC modems communicating and then introducing LED lamps that add noise to the channel. Drops in data...
In pursuit of a wireless (contactless) power line communications (W-PLC) system for low voltage (LV) power distribution networks, a commonly utilized bundled low voltage electrical cable called Cabtyre, was energized with a range of frequencies up to 3 GHz. The intention was to characterize the cable from a radio frequency radiation perspective for the utilization of standard low voltage distribution...
This paper proposes a noise source model for power converters consisting of a single source as well as impedances that model imbalance. The single source models Differential Mode (DM) noise, while the imbalance in the model the Common Mode (CM) noise. This is different from models where both the DM and CM sources are modeled independently. Such models rely on external black box observations and do...
Drawing on public relations, communication and marketing theories, this article explores South Africa's Saambou Bank tumbling from growth and positive media coverage to its downfall in one year. Interviews with Saambou officials and financial journalists, as well as a media content analysis of Saambou media coverage, investigates this issue. Theoretically comparing Saambou with the US Enron Corporation,...
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