127
9.6
OPTIMIZING ANTENNA ALIGNMENT WITH RX MEASUREMENT
When the whole radio link is on, antenna alignment can be optimised. Antenna alignment optimization is
performed depending on the Rx signal power at local and remote equipment and evaluating both local and
remote S/N value maximizing them.
There are two possibilities to see the Rx signal power level:
•
through WebLCT interface
•
through a voltmeter connected to Auxiliary connector on the ODU (F03608 cable - see
In order to get the Rx signal power level by means of software, connect the PC to serial input of ALFOplus
(LAN2) and start the communication towards the ODU microcontroller with SCT/WebLCT supervisory pro-
gram.
Into WebLCT is shown in the top status bar (Rx1A=-value dBm) see
.
If you’re using a voltmeter the Rx signal power level is available on the auxiliary connector of ODU, the
measurement can be performed with a proper cable (see
Following this last procedure, the voltage you’re reading with the voltmeter is proportional to Rx power
level, refer to
Tab.27 - Voltage measured in auxiliary port
Typical Rx signal power level:
-40dBm. It is the most important item to optimise the antenna alignment,
but in a situation of interference Rx level can be good, BER acceptable but BER margin low. This means
that when Rx fields will decrease then BER will increase fast. The situation can be easily shown with SCT/
WebLCT software looking at Signal Quality level.
Into WebLCT Software select:
•
Equipment menu
•
Maintenance
•
S/N Meas. card (see
Refer to the “ALFOplus operator” manual for parameter evaluation.
Received Signal (dBm)
Signal Output (V)
Error (dB)
-20
4.68
±5
-30
3.51
±5
-40
2.34
±3
-50
1.17
±3
-60
0
±3
-70
-1.17
±3
-80
-2.34
±3
-90
-3.51
±5
-100
-4.68
±5
Formula
RSSI= (Signal/Output)/Slope
Slope (V/dB)
0.117
Offset (dBm)
-60
Содержание ALFOplus
Страница 1: ...ALFOplus Access Link Full Outdoor User Manual MN 00273 E 004 ...
Страница 16: ...14 MN 00273 E 004 ...
Страница 22: ...20 MN 00273 E 004 Fig 6 ALFOplus front side view 254 mm 254 mm 157 mm ...
Страница 86: ...84 MN 00273 E 004 ...
Страница 97: ...MN 00273 E 004 95 Fig 34 ODU with standard coupling kit O ring Coupling kit ...
Страница 98: ...96 MN 00273 E 004 Fig 35 1 0 ODU installation 3 1 2 ...
Страница 99: ...MN 00273 E 004 97 Fig 36 Polarization disk Reference ...
Страница 100: ...98 MN 00273 E 004 Fig 37 1 1 ODU installation 3 1 2 ...
Страница 101: ...MN 00273 E 004 99 Fig 38 1 0 antenna flange 4 3 4 1 2 5 114 60 ...
Страница 102: ...100 MN 00273 E 004 Fig 39 1 1 antenna flange 3 1 2 4 7 5 6 ...
Страница 109: ...MN 00273 E 004 107 Fig 49 Bend strain relief to lay along cable Crimp plug and strain relief ...
Страница 112: ...110 MN 00273 E 004 Fig 53 PO0032 ...
Страница 113: ...MN 00273 E 004 111 Fig 54 Connector positions Warning Tighten all unused connectors with the appropriate cover OK NO ...
Страница 118: ...116 MN 00273 E 004 Fig 58 ALFOplus connectors Fig 59 SFP LC LC Fig 60 SFP LC OPEN END ...
Страница 119: ...MN 00273 E 004 117 Fig 61 SFP LC SFP LC Fig 62 LC connector Fig 63 SFP into ALFOplus ...
Страница 120: ...118 MN 00273 E 004 Fig 64 Locked connection Fig 65 Unplug SFP ...
Страница 123: ...MN 00273 E 004 121 Fig 66 IP address setting Fig 67 Local area connection ...
Страница 144: ...142 MN 00273 E 004 Fig 82 Event log window ...
Страница 150: ...148 MN 00273 E 004 ...
Страница 220: ...218 MN 00273 E 004 ...
Страница 224: ...222 MN 00273 E 004 ...
Страница 230: ...228 MN 00273 E 004 ...