This part of IEC 61300 describes the procedure to measure the withdrawal force between the
ferrule (gauge pin) of the plug connector and the resilient alignment sleeve of the adapter. The
gauge pin should have the same shape (chamfer) like the normal ferrules described in the
optical interface, see IEC 61755-3 series and IEC 61754 series. This measurement procedure
is applicable to single-fibre cylindrical ferrule optical connectors.