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Interposition trunk

In telecommunication, the term interposition trunk has the following meanings:

1. A single direct transmission channel, e.g., voice-frequency circuit, between two positions of a large switchboard to facilitate the interconnection of other circuits appearing at the respective switchboard positions.

2. Within a technical control facility, a single direct transmission circuit, between positions in a testboard or patch bay, which circuit facilitates testing or patching between the respective positions.

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

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