Optical Time-Domain Reflectometer troubleshooting of a passive optical network can be enhanced by deploying cascaded splitters, at least some of which have multiple inputs. The port addition section involves the addition of new ports to each switching element. The pocket is fabricated from a unified piece of material and shaped accordingly to distinctly define a frontal tapered member bounded by a right side member and a left side member integrally incorporating an outer extending flange. The base bracket has a stopper and pivotally supports the first link member and the second member in a freely turning way. A third panel is located between the first panel and the second panel.