NEC 5800/320MA Manuale Utente

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Troubleshooting Ethernet PCI Adapters
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Express5800/320Ma: PCI Adapter Guide
 
Checking Cables of Ethernet PCI Adapters
If your system cannot communicate with the network using a particular Ethernet port, 
make sure that the Ethernet cable is properly connected to the port and that the 
ACT/LNK LED on the port is lit. For information about the cables for Ethernet PCI 
adapters, see 
. Note the 
following maximum allowable distance between an Ethernet PCI adapter and a switch.
The maximum distance between a U575 PCI adapter or an embedded Ethernet 
PCI adapter and a hub or switch is 328 ft (100m). 
The maximum distance between a U574 PCI adapter and a switch is 902 ft (275m).
For U575 PCI adapters or embedded Ethernet PCI adapters configured at 100 or 1000 
Mbps, low-quality cables might cause signal integrity problems. If a connection using 
either of these Ethernet PCI adapters fails to operate at 100 or 1000 Mbps, you can 
determine if the cable is at fault by using the same cable but resetting the data rate to 
10 Mbps. For more information, se
You can also run diagnostic tests on cables. For more information, see 
Verifying Link Data Rate and Mode
If a problem persists when the network cables are properly attached and the distances 
are within acceptable limits, examine the data rate and duplex mode (full or half) of 
each Ethernet PCI adapter and its link partner. Verify that these values are appropriate 
and that they are supported by both the adapter and the link partner.
For more information, se
Checking the Network Statistics
If there is a viable link between each Ethernet PCI adapter and its link partner, but 
network connectivity is still intermittent, check the network statistics for the individual 
adapters and associated teams to see if there are any errors.
Look for the network statistics in the Network Driver tab of a particular adapter or team 
in the PROSet utility (