B&B Electronics 855-12840--49 - Manual - Manual (Page 20)

16
Installation Troubleshooting
The following information assists in troubleshooting the Modular Media
Converters:
• 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 connect, establish
BOTH the twisted pair and fiber connections in order to establish link LEDs.
• To test a media converter by itself, have an appropriate fiber patch cable,
then follow these steps to test:
1. Connect the media converter 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
media converter.
3. Verify that both the twisted pair and the fiber link (see LEDs, below) on the
media converter.
NOTE
Use caution when conducting a loopback test; it is possible to create a network loop
if connecting the twisted pair port to an active network switch. B&B Electronics
recommends connecting the twisted pair cable to a PC for this type of test.
• Make sure to use the appropriate twisted pair cable, and have the
crossover/straight-through switch set correctly if the media converter does
not include AutoCross.
• If using a high powered device (which is designed for long distance
installations) for a short distance installation, the fiber transmitters may
overdrive the receivers and cause data loss. If this is the case, an optical
attenuator may need to be added to the connection.