Link Troubleshooting

If the HP Jetdirect 640n Print Server does not successfully connect to the network:

●All LEDs (Link, Activity, and link speeds 10, 100 and 1000) will be off.

●LAN ERROR - LOSS OF CARRIER will be indicated on the HP Jetdirect Configuration Page. If a link failure is indicated, try the following:

●Verify cabling connections.

●Manually configure the link setting on the print server to match the port configuration of the network hub or switch. For manual configuration methods, see Link Configuration Methods on page 18. Turn the printer/MFP off, then on again, to re-initialize the setting on the print server.

●Print an HP Jetdirect configuration page and verify link settings on the print server.

Table 4-2Link Settings

Item	Description

Port Config	If the print server is properly linked, this item indicates one of the following link settings:
	◦	10BASE-T HALF: 10 Mbps, half-duplex
	◦	10BASE-T FULL: 10 Mbps, full-duplex
	◦	100TX-HALF: 100 Mbps, half-duplex
	◦	100TX-FULL: 100 Mbps, full-duplex
	◦	1000TX FULL
	If the print server is not properly linked, one of the following messages will appear:
	◦	UNKNOWN: The print server is in an initialization state.
	◦	DISCONNECTED: A network connection has not been detected. Check network cables. Re-
		configure the link settings on the print server, or cold-reset the print server.

Auto	Indicates whether auto-negotiation for link configuration is on or off.
Negotiation	◦	ON (default): The print server will attempt to automatically configure itself onto the network at
	◦
		the proper speed and communication mode.
	◦	OFF: You must manually configure the link speed and communication mode using the control
		panel menus. Your settings must match those of the network for proper operation.

Link Configuration Methods

The HP Jetdirect 640n Print Server supports 10, 100, or 1000 Mbps network link speeds using full- duplex or half-duplex communication modes (a 1000T half-duplex selection is not supported). By default, the print server will attempt to auto-negotiate its link operation with the network.

When connecting to network hubs and switches that do not support auto-negotiation, the print server will configure itself for 10-Mbps or 100-Mbps half-duplex operation. For example, when connected to a non-negotiating 10 Mbps hub, the print server will automatically set itself to operate at 10 Mbps half- duplex.

18 Chapter 4 Troubleshooting

HP 640n Print Server manual Link Troubleshooting, Link Configuration Methods