3Com NJ90 Network Jack User Manual

Also see for NJ90 Network Jack: Datasheet

Contents

3Com NJ90 Network Jack User Manual Manual pdf 19 page image

Appendix E: Troubleshooting the NJ9013Appendix E: Troubleshooting the NJ90If you encounter problems with the NJ90:1. Verify the NJ90 is receiving power by viewing the Power LED (itshould be lit). If the Power LED is not lit, make sure:• The other end of the network cable is plugged into a systemthat provides Power over Ethernet according to IEEE 802.3af,if using Power over Ethernet.• The Local Power Supply is plugged into the NJ90 and into aworking electrical outlet, if using Local power supply.2. Verify the NJ90 is connected to the network properly by viewingthe Link LED (it should be lit). If the Link LED is not lit, make surethe network cable:• Is terminated properly. Refer to the connector manufac-turer’s instructions for terminating the cable. Be sure to testthe connector and verify it is working.• Has a valid connection to the network.• Adheres to proper length and cabling specifications for yournetwork.3. Make sure the port on the switch to which the NJ90 is connected isconfigured as a standard MDI-X port. Make sure all cables con-necting the NJ90 to the patch panel are straight-through cables(not crossover cables).