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BS EN 61334-6:2001, IEC 61334-6:2000
In multiphase power lines, a separate signal might be sent on each phase to speed up the transmission. The system should be able to adjust the receiving method on each byte packet. One tone is chosen for mark i. Verteilungsautomatisierung mit Hilfe von Traegersystemen auf Verteilungsleitungen.
IEC – Wikipedia
The standard’s low speed is caused by the limited number of bits per power line cycle. The high reliability comes from its reliable timing system i. The first four bytes of each packet are a preamble to measure the channel’s current condition.
Related standards use the physical layer e. S-FSK spread frequency-shift keying is a modulation scheme that combines some of the advantages of classical spread-spectrum modulation immunity against narrow-band interference with some of the advantages of classical frequency-shift keying FSK is low complexity.
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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. IECknown as Distribution automation using distribution line carrier systemsis a standard for low-speed reliable power line communications by electricity meterswater meters and SCADA.
Retrieved from ” https: Click to learn more. The data from zero crossings should be collected into 8-bit bytes. The bytes from the low-layer packets are reformed into bytes for the ifc layers. Electric power distribution, Electric power transmission, Electric power distribution lines, Data transmission, Electric power transmission networks, Electric power networks, Automatic control systems, Control systems, Coding data conversionCodes, Data handling, Data syntax, Data transfer.
The tones are chosen by utilities, not specified in the standard. Learn more about the cookies kec use and how to change your settings. From Wikipedia, the free encyclopedia. This page was last edited on 30 Marchat The physical layer synchronizes a small packet of tones to the zero-crossing of the power line’s voltage. The standard permits each zero-crossing to convey jec, 2, 4 or 8 bits, with increased sensitivity to timing as the number of bits increases.
Automatisation de la distribution iiec l’aide de systemes de communication a courants porteurs. The most significant bits are sent first, unlike a conventional serial port. 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. The 6334-6 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.
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.
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