When the radio hop is operating normally:
• The PWR lamp (green LED) is lighted.
• The TX ALM and RX ALM lamps (red LEDs) are extinguished (not lighted).
• The RSSI test jack voltage level (measured with a Voltmeter) is between 0 and 4.8 Vdc.
• A T1 (or E1) loopback test indicates no errors.
Trouble Symptoms and Suggested Corrective Actions
No.
TROUBLE
SYMPTOM
CORRECTIVE ACTION
1
No communication link
between two Aurora
radios in the hop and
the PWR lamp (green
LED) is OFF.
1) Make sure the power switches on the radios at both ends of the
hop are turned ON.
2) Check the connections to the power source.
3) Check the power source itself for availability of power.
2
No communication link
between two radios in
the hop and the PWR
LED is lighted.
1) Make sure far-end radio is turned ON.
2) Check the RSSI voltage level.
3) Check all cables for proper and secure connections.
4) Check the antennas for proper “line-of-sight” alignment.
3
The TX ALM lamp (red
LED) is lighted.
1) The transmit output power level may be too low (3 dB lower than
nominal).
4
The RX ALM lamp (red
LED) is lighted.
1) Check the RSSI voltage level.
2) Check the antennas for proper alignment.
3) Check the transmit output power at the distant end; the power to
the Rx end is too low.
5
LOS Alarm
1) Loss of signal (LOS) means the DS1/E1 signal is missing at the
input of the modem board.
(continued on other side)
Troubleshooting Guide
Issue 1, December 1999
IMN-201627-E01
Microwave Communications Division - ISO 9001 Certified
