Install the Cisco MDS 9148S mounting rails

1. Attach the two mounting ears to the front sides of the switch using the three M4 screws that came with each bracket.
   
   
   
2. Attach the rear mounting bracket to the switch using M4 screws provided with the mounting kit.
3. On the front side of the rack, install three M5 caged nuts (from the rack accessory kit) in the top, middle, and bottom square holes of the left and right sides of U25 and U26.
4. On the rear side of the rack, install two M5 caged nuts (from the rack accessory kit) in the top and bottom square holes of the left and right sides of U25 and U26.
5. Connect the two long halves of the mounting rail kits to the front of the rack using two M5 screws per bracket as shown in the following image.