JetDirect explained

JetDirect
Type:Print server
Manufacturer:Hewlett-Packard

JetDirect is a line of external print servers formerly sold by Hewlett-Packard (HP). The JetDirect allows computer printers to be directly attached to a local area network.

Protocols

More advanced versions of JetDirect supported a number of network printing protocols. However, the protocol that ended up being associated with it, the JetDirect protocol,[1] is its raw TCP/IP protocol sometimes referred to as Socket API or RAW. It is an extremely simple network printing protocol.[2] Submitting a print job can be done by netcating a file containing the page 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.[2]

AppSocket is a very similar implementation by Tektronix for Phaser printers, later sold to Xerox.[3] This protocol adds support for querying for printer status by non-printing users via a separate UDP port.[4]

Most JetDirect devices also came with, JetDirect Interface, a telnet interface for configuring the device or printer.[5]

Internal print servers

EIO

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 the Conventional 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.

615n series ASIC issue

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.[10]

External links

Notes and References

  1. Web site: Using Network Printers. cups.org. 2017-09-06.
  2. Web site: Socket API. Patrick A. Powell. LPRng Reference Manual. 26 Nov 2010. 3.8.35. 7 December 2019. 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..
  3. Web site: Printing to a Xerox Multifunction Device Using Port 9100. Xerox Multifunction Devices - Customer Tips. September 26, 2003. 7 December 2019.
  4. Web site: AppSocket TCP/IP Protocol. Patrick A. Powell. LPRng Reference Manual. 26 Nov 2010. 2017-09-06. 2015-10-24. https://web.archive.org/web/20151024170106/http://lprng.com/LPRng-HOWTO-Multipart/appsocket.html. dead.
  5. Web site: HP JetDirect Interface. Patrick A. Powell. LPRng Reference Manual. 26 Nov 2010. 3.8.35. 7 December 2019.
  6. Web site: HP 1284B Parallel Card . February 27, 2016.
  7. Web site: HP Jetdirect 640n Print Server. February 27, 2016.
  8. Web site: HP Jetdirect 690n IPv6/IPSec 802.11g Wireless Print Server - overview and features . September 18, 2008 . dead . https://web.archive.org/web/20081228045553/http://h10010.www1.hp.com/wwpc/us/en/sm/WF05a/18972-18972-236253-34210-396578-3662193.html . December 28, 2008 .
  9. Web site: HP Jetdirect 695nw Print Server . February 27, 2016.
  10. Web site: HP J6057A 615n EIO 10/100 Information . February 2, 2016 . dead . https://web.archive.org/web/20110609014450/http://www.hp.com/pond/jetdirect/j6057a.html . June 9, 2011 .

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