Buy IEC Ed. Distribution automation using distribution line carrier systems Part 6: A-XDR encoding rule from SAI Global. IEC (), Distribution automation using distribution line carrier systems. Part 6: A-XDR encoding rule: Defines a set of encoding rules that may be. Purchase your copy of BS EN , IEC as a PDF download or hard copy directly from the official BSI Shop. All BSI.
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Your basket is empty. 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. A-XDR encoding rule Status: Wide area networks Networking standards. Related standards use the physical layer e.
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. This is followed by 38 bytes of data, and 3 byte-times of silence.
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The higher link-layer strongly resembles HDLCexcept with a novel feature that allows selected stations to retransmit messages. You may find similar items within these categories by selecting from the choices below:.
This page was last edited on 30 Marchat Take the smart route to manage medical device compliance. Find Similar Items This product falls into the following categories. The silence and the preamble allow the receiver’s signal processing to measure the channel’s noise ratios. Depending on the signal to noise ratios, the bits can be recovered from the difference between the power of 611334-6 mark and space tones, the power of the mark 6334-6 only, or the space tones only.
Views Read Edit View history. The tones are chosen by utilities, not specified in the standard. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.
BS EN 61334-6:2001, IEC 61334-6:2000
The data from zero crossings should be collected into 8-bit bytes.
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Accept 6133-6 continue Learn more about the cookies we use and how to change your settings. You may experience issues viewing this site in Internet Explorer 9, 10 or The bytes from the low-layer packets are reformed into bytes for the higher layers.
The physical layer synchronizes a small packet of tones to the zero-crossing of the power line’s voltage. In multiphase power lines, a separate signal might be sent on each phase to speed up the transmission. Click to learn more. IECknown as Distribution automation using distribution line carrier systemsis a standard for low-speed reliable power line communications by electricity meterswater meters and SCADA.
The most significant bits are sent first, unlike 613334-6 conventional serial port. 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.
Search all products by. 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. 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.