HP Manual
J2593-90011
is compatible in the following HP Models:
HP Jetdirect EX Plus 3 series
HP JETDIRECT EX PLUS 3 PRINT SERVER FOR ETHERNET - J2593A
HP JETDIRECT EX PLUS 3 PRINT SERVER FOR TOKEN RING - J2594A
HP DesignJet 820 MFP series
HP DESIGNJET 820 MFP - Q6685A