SF Cable, 48 Port CAT6 110 Patch Panel Rackmount w/LED Indicator With LED patch panel and Signal Generator(102213), you can instantly identify ports without removing panel wiring or shutting down system No more cumbersome trial and error port serch with tone generator and probe; Just connect Signal Generator to wall plate LED indicator on patch panel instantly guidse you to corresponding port LED patch panel is a powerful port identification solution, especially when you are managing large scale networking 25 years warranty