Is the connection from your 3448 to your router set as a Trunk port? Does the router have the same VLANs on it along with IP addresses assigned to them? For instance the router will have VLAN 160 on it with an IP address of 10.21.162.1 Set the printer to 10.21.162.86, with a gateway of 10.21.162.1.
Just connected a 5548p to our network and I can get on the web interface, I have created several vlans and set them all to access, I have one port (48) on vlan 1 as trunk, Not sure why but when I connect a device to one of the vlan ports I have no access to it I can't ping or anything, I read somewhere on another forum that I need vlan routing enabled but for the life of me I cannot find anywhere to enable vlan routing, or maybe it is some other issue that is causing the problem? I also did the switchport mode access for all vlans and trunk allowed vlan add command for all vlans.
Dell 5548P Vlans