Chapter 6: Troubleshooting
6. Troubleshooting
•During installation, first test the fiber and twisted pair connections with all troubleshooting features disabled, then enable these features, if desired, just before final installation. This will reduce the features’ interference with testing.
•When working with units where the features cannot be disabled, establish both the twisted pair and fiber connections before the link LEDs will light.
•To test a L2 by itself, first, have an appropriate fiber patch cable, then follow these steps:
1.Connect the L2 to the twisted pair device with a twisted pair cable.
2.Loop a single strand of fiber from the transmit port to the receive port of the L2.
3.Verify that both the twisted pair and the fiber link are lit (see LEDs, below) on the L2.
•Use the appropriate twisted pair cable, and have the crossover/pass- through switch set correctly.
•Whenever possible, set the devices connected to the L2 (hub, switch, NIC card) to the desired speed and Duplex setting, and turn Auto Negotiation OFF. Refer to Auto Negotiation on L2, also configure the devices on the opposite sides of the L2 to operate at the same speed and Duplex setting.
NOTE
Some 10/100 devices can not be set by the end user, and must Auto Negotiate to
receive a signal.
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