A chassis panel defines one or more rearward-facing, open-ended slots at a rear of the chassis panel. One or more management inserts can be mounted within the open-ended slot along a forward-rearward axis. Cables can be pre-cabled through the inserts prior to being installed at one or more port modules. Accordingly, the port modules can be cabled prior to being installed at the chassis panel without first having to thread the cables through the chassis panel. Alternatively, the cables can be slid directly into the open-ended slots during installation of the port modules.