No network access with Dell C2660dn

Hello,

I just bought a Dell C2660dn. It shall be placed in a separate room, access shall be done through DLAN. I can find the printer as LAN accessed in my routers application software (Fritzbox 7490) but it is not found in the network by my computers. What is going wrong as I understand that the printer has AirPrint capability.

Many thanks in advance