A patch panel is the 19-inch rack component where all permanent links arriving at a floor distribution point are terminated and made accessible at the front. Cables from the walls terminate at the rear, and front ports connect to switches with patch cords. This separation lets connections change without touching the permanent cabling.
There are two basic types. In fixed (loaded) panels the ports are built in and 110 IDC contacts sit at the rear, terminated with a punch down tool. In blank (keystone/modular) panels the positions are empty and the chosen keystone jacks are fitted. The modular format allows mixing categories (Cat6, Cat6A) or media types (copper, fiber) in one panel and replacing a single faulty port.
Port count and height are planned together. 24 ports typically occupy 1U and 48 ports 2U. Leaving spare ports above current need matters for adding connections later without pulling cable. Fitting a 1U cable organiser under each panel prevents cords piling up in front and blocking port access.
If screened (FTP) cabling is used, the panel must be screened too and its earth terminal bonded to the cabinet earth bar. Screen continuity must run unbroken from cable through jack, panel and cabinet to the building earth; a break anywhere renders the screen useless. Labelling is part of the panel too: without a record of which port serves which room, every intervention starts with tracing.