Interchangeability (telecommunication)
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In telecommunication, an interchangeability is a condition which exists when two or more items possess such functional and physical characteristics as to be equivalent in performance and durability, and are capable of being exchanged one for the other without alteration of the items themselves, or of adjoining items, except for adjustment, and without selection for fit and performance.
Source: from Federal Standard 1037C and from the Department of Defense Dictionary of Military and Associated Terms
