* A communication channel with only one endpoint. * A patch cable, applied manually or automatically, remotely or locally, that facilitates a loop-back test. Commonly called loop around when the interconnecting circuit is accessed by dialing. * A method of testing between stations (not necessarily adjacent) wherein two lines are used, with the testing being done at one station and the two lines interconnected at the distant station. * A method of performing transmission tests of access lines from the serving switching center, which method usually does not require the assistance of personnel at the served terminal. This is primarily intended as a means of testing the transmission or transportation infrastructure.Įxamples of applications include the following: The term loopback (sometimes spelled 'loop-back') is generally used to describe methods or procedures of routing electronic signals, digital data streams, or other flows of items, from their originating facility quickly back to the same source entity without intentional processing or modification.
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