Back-to-back connection

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A back-to-back connection is the direct connection of the output of one device to the input of a similar or related device.


In telecommunications, a back-to-back connection can be formed by connecting a transmitter directly to a receiver without a transmission line in between;[1] this is used for equipment measurements and testing purposes. The back-to-back connection eliminates the effects of the transmission medium.

In some cases, the output of a receiving device is instead connected to the input of a transmitting device.

Power transmission[edit]

A back-to-back connection for electric power transmission is a high-voltage direct-current (HVDC) system with both ends in the same switchyard; this is used to couple asynchronously operated power grids or for connecting power grids of different frequencies where no DC transmission line is necessary.


In electronics, a back-to-back connection is the connection of two identical or similar components in series with the opposite polarity; this is used to convert polarised components to non-polar use. Common examples include: