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bipolar method

The bipolar method is a transmission method used in the baseband which assigns the transmit amplitude "0" to the binary value "0" to be transmitted and the transmit amplitude "+A" and "-A" alternately to the logical "1".

Bipolar method

Bipolar method

To recover the information in the receiver, the decision thresholds must be set to the value ± A/2 for a received signal with the amplitudes 0 and ± A respectively. The bipolar method eliminates the disadvantages of the single-current and double-current methods in the transmission of long "0" and "1" sequences, respectively, because it does not contain a direct-current component; however, it is not self-clocking. It was originally developed for Ethernetcoding and corresponds to Alternate Mark Inversion (AMI).

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Englisch: bipolar method
Updated at: 29.01.2004
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