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A-XDR encoding rule Status: IECknown as Distribution automation using distribution line carrier systemsis a standard for low-speed reliable power line communications by electricity meterswater meters and SCADA.
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BS EN 61334-6:2001, IEC 61334-6:2000
The frequencies are placed far enough apart that frequency-selective fading and narrow-band interference only blocks one of the frequencies, so the receiver can still recover all the data from the other frequency.
The standard’s low speed is caused by the limited number of bits per power line cycle.
The first four bytes of each packet are a preamble to measure the channel’s current condition. One tone is chosen for mark i. Depending on the signal to noise ratios, the bits can be recovered from the difference between the power of the mark and space tones, the power of the mark tones only, or the space tones only. Find Similar Items This product falls into the following categories.
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The standard permits each zero-crossing to convey 1, 2, 4 or 8 bits, with increased sensitivity to timing as the number of bits increases. You may find similar items within these categories by selecting from the choices below:.
The physical layer is adaptive. This is followed by 38 bytes of data, and 3 byte-times of silence.
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Automatisation de la distribution a l’aide de systemes de communication a courants porteurs. Take the smart route to manage medical device compliance. The system should be able to adjust the receiving method on each byte packet.
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For example, it lets a central controller read a unit’s signal to noise ratios, and set the bit that enables a station to retransmit weak stations. Wide area networks Networking standards. Related standards use the physical layer e. You may experience issues viewing this site in Internet Explorer 9, 10 or The tones are chosen by utilities, not specified in the standard. The most significant bits are sent first, unlike a conventional serial port.
The data from zero crossings should be collected into 8-bit bytes. The high reliability comes from its reliable timing system i. It is actually a series of standards describing the researched physical environment of power lines, a well-adapted physical layer, a workable low-power media access layer, and a management interface. Each byte is collected into byte packets.
The physical layer synchronizes a small packet of tones to the zero-crossing of the power line’s voltage.