This test measures fiber pushback@ defined as permanent or semipermanent fiber motion under load. It does not include temporary fiber movement relative to the ferrule due to temperature variations@ or permanent fiber withdrawal that occurs when no load is present. The test applies to any type of optical connector in which a fiber is affixed into a ferrule by means of an adhesive. To perform this test procedure@ the user must have the capability of measuring the fiber position relative to the ferrule to within the accuracy required by the Detail Specification. Contacting or non-contacting interferometry are the typical types of measurement equipment used. Because this test is for comparative purposes only@ and not intended to simulate the actual amount of fiber pushback in optical connectors@ it is not a specifiable parameter. Therefore@ this test method shall not be called out in any TIA specification document.