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Section 6 Troubleshooting Guide TRACER 4106/4206 System Manual
56 © 2004 ADTRAN, Inc. 612804206L2-1A
This troubleshooting guide provides recommended actions for various conditions of the TRACER 4106/4206
system. The status LEDs (located on the front panel of the unit) provide information to help determine the
necessary troubleshooting action. Recommended actions for resolving possible status LED indicators are
contained in this guide.
2. LED INDICATORS
If the PWR LED is not ON and solid green, it is an indicator that the TRACER 4106/4206 is not receiving
adequate DC power.
1. Verify that the power source is delivering between 21 and 60 VDC.
2. Check the polarity of the power connection (referenced to ground) of both the TRACER 4106/4206 unit
and the power source. See DC Power Connection (Plug-In Terminal Block) on page 31 for details on
power supply connections.
3. Check the internal fuse. The fuse is accessed from the rear panel of the unit. If this fuse is open,
replace with a 1A, 250 V (2-inch) slow-blo fuse.
The TST LED will blink once (amber) during the power-up sequence to indicate a self-test is in progress. If
TST LED is blinking or remains ON after 10 seconds, this indicates that the TRACER 4106/4206 unit has
failed the self-test. This is an internal failure, and ADTRAN technical support should be contacted.
RF DOWN LED
If the RF DOWN LED is ON (solid red), it is an indicator that there is a problem with the RF receive path
from the remote TRACER 4106/4206.
1. Verify that one end of the link is configured as Plan A and the other end as Plan B, and that both ends
have the same bandplan number (ex. A1 and B1). See >TRACER System Options > RF Bandplan on
page 48 for further details.
2. Verify that both ends of the link are configured for the same number of active T1 ports. See >TRACER
System Options >Active T1 Ports on page 48 for more details.
3. Measure the RSSI voltage and consult the RSSI Calibration sheet included with the unit. If the voltage
level corresponds to a received signal power level that agrees with the calculated receive signal level, go
to Step 8.
4. Check the RF coaxial cable connection.
5. Verify that the antenna polarization is the same at both ends of the RF signal transmit and receive path.
6. Verify the RF signal path is clear.
7. Check the integrity of the lightning arrestors.
8. Check for possible interference at both ends of the link. If necessary, change polarization and/or
bandplans at both ends.