Troubleshooting
64
Technician’s Installation & Operation Guide
No
Item
Description
Troubleshooting
1
Alarm
Low Input Signal
Check the ‘DL RSSI’ signal level on the WebGUI.
Input signal level should be more than -85dBm (Recommendation)
If the signal level is not strong enough, move the DAU to another position to receive
stronger signals from BTS
2
Alarm
Isolation
Caused by the lack of isolation between DAU and SAU.
Change position of DAU to improve isolation between DAU and SAU
Isolation value ≤ Gain + 15dB
3
Alarm
Isolation Re-Check
This is a self-checking stage when the isolation between DAU built-in antenna and SAU
built-in antenna is not enough.
4
Alarm
Low Input Voltage
DAU needs to have more than +12VDC of Input DC power.
Check connection of Link Cable to both DAU and SAU.
Check DC output level at DC jack of AC/DC adaptor by Multi-meter (Testing tool),
Its value shall be 19VDC
±
1V.
5
Alarm
Link Fail
Check connection of Link cable to both DAU and SAU.
Check cable DC Resistance.
Normal DC Resistance: 4.0 Ω ~5.0 Ω
6
Alarm
Shutdown
Check input signal level of DAU site.
If Input signal level is stronger than -25dBm (RSSI on WebGUI), then DAU’s position.
Input signal level range: -25dBm above
Check ALC status on WebGUI and turn on ALC if it is off.
7
Alarm
PLL Fail
Replace installed SMR-IP10 with the new one.
