A structured optical fiber cabling system configured to connect first and second layers of switches in a mesh network is disclosed. The system comprises a plurality of fiber optic modules each including a plurality of first fiber optic ports distributed in a vertical direction when the fiber optic modules are installed in a chassis. A plurality of fiber optic jumper assemblies each include a horizontal segment and a plurality of legs and fiber optic connectors extending from the horizontal segment, with each fiber optic connector configured to connect to a corresponding fiber optic port of the plurality of first fiber optic ports at the same vertical location in each fiber optic module.