Backbone cabling, or vertical cabling, refers to the cables running between entrance facilities, equipment rooms, and telecommunications rooms. These cables are typically high-capacity, such as fiber optic or high-grade copper, and can handle large amounts of data traffic. Protection devices for grounding, shielding and lightning. The ER must maintain controlled temperature and. FDF, or Fiber Distribution Frame, is a key component used for the termination, utilization, and management of optical cables between wiring rooms and equipment rooms. This area typically contains: 2. Equipment Room (ER): The equipment room houses the main networking.