A type of communications circuit board that mounts high-density connectors onto a multi-layer printed circuit board, and which interconnects with numerous other circuit boards – such as those in servers. Backplanes serve as the core communications conduit in high-density, high-performance server systems. Also referred to as "mid-plane" in some cases.
 Noise caused by crosstalk and reflections
Crosstalk refers to signals affecting adjacent wires, and reflections refer to noise caused by mismatches in communications characteristics, such as those of connectors. Both crosstalk and reflections can hinder high-speed communications.
 Two types of equalizer circuits
A one-level decision feedback equalizer circuit minimizes crosstalk and reflections, and a linear equalizer circuit compensates for transmission losses. Conventionally, multi-level decision feedback equalizer circuits have been used for compensation of transmission losses in backplanes.
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Date: 12 February, 2009
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