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BS EN 61334-6:2001, IEC 61334-6:2000
The data from zero crossings should be collected into 8-bit bytes. 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.
Electric power distribution, Electric power transmission, Electric power distribution lines, Data transmission, Oec power transmission networks, Electric power networks, Automatic control systems, Control systems, Coding data conversionCodes, Data handling, Data syntax, Data transfer.
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In multiphase power lines, a separate signal might be sent on each phase to speed up the transmission. 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. Verteilungsautomatisierung mit Hilfe iev Traegersystemen auf Verteilungsleitungen. 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.
This is followed by 38 bytes of data, and 3 byte-times of silence. You may experience issues viewing this site in Internet Explorer 9, 10 or The high reliability comes from its reliable timing system i. Retrieved from ” https: The first four bytes of each packet are a preamble to measure the channel’s current condition.
The silence and the preamble allow the receiver’s signal processing to measure the channel’s noise ratios. The tones are chosen by utilities, not specified in the standard. Views Read Edit View history. A-XDR encoding rule Status: This page was last edited on 30 Marchat The standard’s low speed is caused by the limited number of bits per power line cycle. The higher link-layer strongly resembles 61334–6except with a novel feature that allows selected stations to retransmit messages.
The physical layer synchronizes a small packet of tones to the zero-crossing of the power line’s voltage. Related standards use the physical layer e. This website is best viewed with browser version of up to 613344-6 Internet Explorer 8 or Firefox 3. It is actually ie 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.
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. IECknown as Distribution automation using distribution line carrier systemsis a standard for low-speed reliable power line communications by electricity meterswater meters and SCADA.
One tone is chosen for mark i. Learn more about the cookies we use and how to change your settings. Your basket is empty. The bytes from the low-layer packets are reformed into bytes for the higher layers. The system should be able to adjust the receiving method on each byte packet. Each byte is collected into byte packets. 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.
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