The 4-port 10/100/1000 Base-TX PCI Express adapter might be failing.
If you replace a 4-port 10/100/1000 Base-TX PCI Express adapter and the problem is not resolved, replace the I/O backplane.
Note: Use the location code to identify the failing unit or enclosure.
Use the following table to determine the part number for the field replaceable unit (FRU).
| CCIN or FFC | Type and model | Part number | Description | Location code |
| 256E | Any | 10N8556 | 4-port 10/100/1000 Base-TX PCI Express adapter | Un-Px |
| 256E | 8203-E4A, 8261-E4S, 9407-M15, 9408-M25 | See System parts. | System backplane | Un-P1 |
| 256E | 8204-E8A, 9409-M50 | 10N9369 | System backplane | Un-P1 |
| 256E | 9117-MMA | 42R7352 | I/O backplane | Un-P1 |
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