Abstract: A back-end variation control cap configured for use with a jack module including a plurality of insulation displacement connectors, the cap being configured for routing a plurality of twisted conductor pairs. The cap includes an upper portion, a bottom portion, a plurality of twisted pair channels extending between the upper portion and the bottom portion, and a pair of opposed end walls, each of the end walls including a plurality of wire constraints disposed thereon. Each wire constraint has opposed surfaces configured to retain one of the conductors and each twisted conductor pair extends through one of the twisted pair channels and the conductors of the twisted conductor pairs are disposed in the plurality of wire constraints such that each conductor is aligned with one of the insulation displacement connectors when the bottom portion is disposed adjacent the jack module.

Abstract: An apparatus for tuning PM optical fiber connections has a first assembly including a light source which is connected to a first coupling stage having a rotatable polarizer, and a second assembly having a second coupling stage and a rotatable polarization analyzer for directing light transmitted through a terminated PM jumper cable coupled between the first and second coupling stages to a power meter. The output of the power meter is applied to a processing unit which, in turn, controls a rotation arrangement for the polarizing and analyzer. Crosstalk of this jumper is determined by ascertaining the angular positions of the maximum and minima outputs of the rotating analyzer, and the terminating connectors of the jumper are turned to the maximum value by aligning with a connector key.