Airspan AS4000, Installation Manual

Page: 149 / 193

Setup and Test
145
For networks where co or adjacent frequencies are reused to provide cellular type
network coverage with limited available spectrum (ie. A relatively high level of co and
adjacent channel interference), the following CT Rx levels apply:
Rx Level (dBm / RW) Modulation
Code Rate
Below 3GHz
Above
3GHz
Session
ids for
LAT TE
command
in Mode 3
QPSK 1/2 -103 dBm -100dBm 58 or 59
QPSK 3/4 -101 dBm -98dBm 56 or 57
16QAM 1/2 -94 dBm -92dBm 54 or 55
16QAM 3/4 -90 dBm (see note 1) -88dBm 52 or 53
64QAM 3/4 Not supported on the uplink
Table 1a
1. To set the receive sensitivity, first set up a test network for the band under test as
shown below. The figure below shows a typical test setup with test equipment
connected directly to the outputs of the DIP/LNA and DIP/LNA2 as would be the case
for systems without a RF coupler.
Test Set-up
2. Zero power meter. Calibrate and apply measurement offset for operational frequency
if applicable.
3. On the AS4020 go to Top Menu >Setup Menu >RF Menu>RX Sensitivity. Set RX to
2500
4. Put AS4020 Shelf into test mode Off and then into test mode 3. (from AS4020 menu
select Setup Menu/RF Menu/RF Commissioning)
5. Configure the Test SIU using AS7020STMON according to modem shelf properties to
the correct frequency, PN code and ID number prior to entering test mode. The
commissioning procedure described in this document is not restricted to any
particular RF channel or PN code. However the user should make sure that both the
CT and ST are programmed with identical RF channel and PN code. If the frequency
can be entered using STMON then the FP command in the step 12 is not necessary)
6. Measure and calibrate the loss of all components shown in the diagram above. To
measure the losses of components use the TX output as a reference source.
Measure the TX output and place figure in table below.. Connect each component in