3Com 3CBLSG24 User Guide - Page 194

194 APPENDIX D: TROUBLESHOOTING Table 12 Troubleshooting Solutions (continued) Problems Possible Cause Device is in a reboot loop Software fault No connection and the port Incorrect ethernet cable, LED is off e.g., crossed rather than straight cable, or vice versa, split pair (incorrect twisting of pairs) Solution Download and install a working or previous software version from the console Check pinout and replace if necessary Fiber optical cable connection is reversed Change if necessary. Check Rx and Tx on fiber optic cable Bad cable Replace with a tested cable Wrong cable type Verify that all 10 Mbps connections use a Cat 5 cable Lost Password Check the port LED or zoom screen in the NMS application, and change setting if necessary Contact 3Com