Cisco ME 1200 Series Hardware Installation Manual page 36

Finding the Switch Serial Number
Auto-negotiation and NICs
Problems sometimes occur between the switch and third-party network interface cards (NICs). By default,
the switch ports and interfaces are set to auto-negotiate. Devices like laptops or other devices are commonly
set to auto-negotiate, yet sometimes auto-negotiation issues occur.
To troubleshoot auto-negotiation problems, try manually setting both sides of the connection. If this does not
solve the problem, there could be a problem with the firmware or software on your NIC. You can resolve this
by upgrading the NIC driver to the latest available version.
Cabling Distance
If the port statistics show excessive FCS, late-collision, or alignment errors, verify that the cable distance
from the switch to the connected device meets the recommended guidelines. See the
Specifications" for cabling guidelines.
Finding the Switch Serial Number
If you contact Cisco Technical Assistance, you need to know the serial number of your switch. Use the
following figure to locate the serial number location. You can also use the show inventory user EXEC
command to get the serial number.
Figure 4-1
Cisco ME 1200 Series Carrier Ethernet Access Devices Hardware Installation Guide
4-2
Serial Number location on the Cisco ME1200-4S-A and ME1200-4S-D
Chapter 4 Troubleshooting
"Connector and Cable
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