According to Epson those printers will not work with Pharos.
Epson America, Inc.
3840 Kilroy Airport Way
Long Beach, CA 90806-2469
Phone Number: (562)276-1305
I asked about the driver and server support for the following two printers.
Epson Stylus Professional 4880
Epson Stylus Professional 7800
Epson stated that these printers will not work in a print server environment.
This appears to be the case with all of the Epson Stylus Professional printers.