HP Color LaserJet 4600 Printer series - Manual (Page 68)

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Enhanced I/O (EIO) configuration
This printer comes equipped with three enhanced input/output (EIO)
slots. The three EIO slots hold compatible external devices such as
the HP Jetdirect print server network cards or other devices. Plugging
EIO network cards into the slots increases the number of network
interfaces available to the printer.
EIO network cards can maximize printer performance when you are
printing from a network. In addition they provide the ability to place
the printer anywhere on a network. This eliminates the need to attach
the printer directly to a server or a workstation and enables you to
place the printer closer to the network users.
If the printer is configured through an EIO network card, configure
that card through the control panel Configure device menu.
HP Jetdirect print servers
HP Jetdirect print servers (network cards) can be installed in one of
the printer’s EIO slots. These cards support multiple network
protocols and operating systems. HP Jetdirect print servers facilitate
network management by allowing you to connect a printer directly to
your network at any location. HP Jetdirect print servers also support
the Simple Network Management Protocol (SNMP), which provides
network managers with remote printer management and
troubleshooting through HP Web Jetadmin software.