Super product. I've been using the device directly to a Fritz box 6360 Cable to over patch panel Patch Panel Cat6a 500MHz 10 Gigabit 24 times - to distribute patch panel 24-port 1U fully shielded an ISDN connection star-shaped wired in the building. I chose this product because it was the instrument with most ports and the possibility is still very low. So far, I only use 2 ISDN ports and it works flawlessly.