The problem is in a 2-Port Multiprotocol adapter cable. 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 |
| 2C3 | Any | 93H5263 | 2-Port Multiprotocol adapter cable V.24 | Un-P1-Cx-Tx |
| 2C3 | Any | 93H5264 | 2-Port Multiprotocol adapter cable V.35 | Un-P1-Cx-Tx |
| 2C3 | Any | 93H5265 | 2-Port Multiprotocol adapter cable V.36 | Un-P1-Cx-Tx |
| 2C3 | Any | 93H5267 | 2-Port Multiprotocol adapter cable X.21 | Un-P1-Cx-Tx |