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Overhead I/O cabling is contained within the frames. Extension “chimneys” that were featured with previous Z systems are no longer used. 

A view of the top rear of the frame and the openings for top exit cables and power is shown in Figure 2-4. When FC 7917 is installed, the plated adjustable shields are removed and the top exit enclosure is installed. 

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A newly designed vertical cable management guide (“spine”) can assist with proper cable management for fiber, copper, and coupling cables. Depending on the configuration, a spine is present from manufacturing with cable organizer clips installed. 

The cable retention clips can be relocated for best usage. All external cabling to the system (from top or bottom) can use the spines to minimize interference with the PDUs that are mounted on the sides of the rack. 

