Technical specifications Interfaces Internet via cable on DOCSIS 3.1/EuroDOCSIS 3.0 cable connection 4 x gigabit LAN port (10/100/1000 Base-T) Wireless access point compliant with IEEE 802.11ac, n, g, a 2 USB 3.0 ports for printers and storage media Integrated DECT base station for up to 6 cordless telephones ISDN S₀ bus (RJ45) for ISDN telephones or ISDN telephone system 2 a/b ports (TAE, RJ11)...
> https://en.avm.de/products/fritzbox/fritzbox-6591-cable/technical-specifications/