Back-to-back connection

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In telecommunications, a back-to-back connection is a direct[1] connection between either:

  1. the output of a transmitting device and the input of an associated receiving device. When used for equipment measurements or testing purposes, such a back-to-back connection eliminates the effects of the transmission channel or medium.
  2. the output of a receiving device and the input to a transmitting device.

[1]The term direct may be construed as permitting a passive device such as a pad to accommodate power level constraints.

Source: from Federal Standard 1037C and from MIL-STD-188
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