User's Manual

PAGE 40 61280.003L1-1B
4/12/99
PROBLEM DESCRIPTIONS AND RECOMMENDED ACTIONS
Each problem described below is followed by a list of Possible
Causes, each of which is followed by a number (or numbers)
corresponding to a Recommended Action (or Actions).
I M P O R T A N T
If problems persist after you have followed the Recommended
Actions, contact ADTRAN Technical Support at [phone].
TROUBLESHOOTING USING THE FRONT PANEL INDICATORS
“LINK ERROR” LIGHT IS LIT, OR LINK IS DOWN
This alarm will activate when the RF link is not operational.
RECOMMENDED ACTION
POSSIBLE CAUSE (SEE LIST BELOW)
• The RF link is down. .................................................................... 1-10
• The RX power is below the -91 dbm threshold. ....................1-4,7-10
• The far-end transmitter is off, or is transmitting
low power ................................................................................ 1-4,7-10
• The RF path is not aligned. .......................................................1,2,10
• Water is in the antenna feedhorn or connectors. ........................... 1,4
• Both units are set to the same frequency. ..................................... 5,10
• Both units are not set to the same PN code. ..................................... 6
• The connection between the BBP and the RFC
is faulty. ...................................................................................... 1,7-10
• The connection between the RFC and the
antenna is faulty. ........................................................................1,7-10
• The BBP or RFC is faulty.................................................................. 10
RECOMMENDED ACTIONS:
1. Check the RX power using the VT-100 user interface or RSSI voltage.
2. Check the far-end transmitter for operation and proper transmit
power.
3. Check the RF path using a spectrum analyzer or RSSI voltages for
proper alignment. Have path professionally re-aligned and check
system path engineering.
4. Check the antenna feedhorn and all outdoor connections for water.
5. Change the frequency of one radio through the VT-100 user interface
or front panel button.
6. Set both units to the same PN code.
SECTION 4