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 JetDirect 600n card | |
| Manufacturer | Hewlett-Packard |
|---|---|
| Introduced | March 1991; 34 years ago (1991-03) |
| Type | Print server |
| Connection | |
JetDirect is a line of externalprint servers formerly sold byHewlett-Packard (HP). The JetDirect allowscomputer printers to be directly attached to alocal area network.[1]
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More advanced versions of JetDirect supported a number ofnetwork printing protocols. However, the protocol that ended up being associated with it, theJetDirect protocol,[2] is its raw TCP/IP protocol sometimes referred to asSocket API orRAW. It is an extremely simple network printing protocol.[3] Submitting a print job can be done bynetcating a file containing thepage description language (e.g. PostScript, PCL) to the appropriate TCP port on the printer (default port is 9100). Information about the printer and job is simply sent to the client while the TCP connection is active. The port would reject connections if the printer is busy.[3]
AppSocket is a very similar implementation byTektronix forPhaser printers, later sold toXerox.[4] This protocol adds support for querying for printer status by non-printing users via a separate UDP port.[5]
Most JetDirect devices also came with,JetDirect Interface, atelnet interface for configuring the device or printer.[6]
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| This sectionneeds expansion. You can help byadding missing information.(September 2025) |
EIO (Enhanced Input/Output) is a modular interface developed by HP for its printers to expand their capabilities. EIO does not just serve JetDirect cards, but EIO hard drives and the EIO Connectivity card for adding communication ports to the printers as well. EIO utilizes the 3.3V signaling technology of theConventional PCI bus and is significantly more energy-efficient than MIO technology. EIO print servers will not work in LIO slots, nor will the LIO print servers work in EIO slots.
Any 615n series card can fail, but it is up to HP to determine if the failure is due to the chipset or some other factor. HP recommended to call them or contact them through the Web site and they will proceed to do some simple troubleshooting steps to determine if the failure is due to the chipset or some other cause.[11]
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The Socket API is a very flexible job transfer protocol. It is widely support by most Print Server manufacturers, with the Hewlett Packard JetDirect setting the de facto standard. The Socket API is extremely simple.
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