Since the front panel of the optical fiber distribution box can be pulled out, the length of the optical cable trunk in the distribution box should be long enough to ensure that when the front panel of the distribution box is completely pulled out, the optical cable will not bear too much. Since the front panel of the optical fiber distribution box can be pulled out, the length of the optical cable trunk in the distribution box should be long enough to ensure that when the front panel of the distribution box is completely pulled out, the optical cable will not bear too much. When selecting a fiber distribution box, several considerations come into play. Firstly, capacity and compatibility are essential factors to evaluate. The box should have sufficient capacity to accommodate the expected volume of optical cables while being compatible with the specific network. The Fiber Optic Association, Inc. The fiber optic contractor should be able to work with the customer in each installation project. Interbay Storage Units (IBU) are used between frames to route and manage jumpers on front of the FDF. The IBUs have nine routing hubs, a top jumper trough, and a jumper trough bridge (Figure 3).