Post

The magic bus is the row of jacks all the way across each row at the bottom.  It's a series of connections/mults that have interconnects to the other cabinets.  You can see it here:

http://media.technoempire.netdna-cdn.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/4/9/4990_17_.jpg

The jacks with the vertical bars are connected to the other cabinets through a patch panel in the back:

http://media.technoempire.netdna-cdn.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/4/9/4990_36_.jpg