HP 310X - Manual (Page 166)

03 LAN Error: EXTERNAL
LOOPBACK
for HP Jetdirect 175x external print server/Internet connector for USB
and HP Jetdirect 310x external print server/Internet connector for
USB
The print server is incorrectly connected to the network or is
defective.
Make sure that your print server is correctly attached to your network.
In addition, check all other cabling and connectors.
For help in correcting this error, please check your print server
documentation (the welcome mat or the User's Guide on the Jetdirect
CD-ROM), or contact HP Jetdirect technical support. Click on the
button below for information on contacting HP.
©2000, 2001 Hewlett-Packard Company