JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
Using LTE
– TDD Signal Analyzer
307
10.
To save your settings and results, go to SAVE/LOAD > Save and then perform functions as you
desire. See
“Using save” on page 31 for more information.
DAS test
The Distributed Antenna System (DAS) testing enables you to check the degradation of performance
in the signal transmission from a radio band to antennas distributed from it. You can save
measurement values at both the radio band and antennas and then compare results with percentage
of changes. You can also save test results in the
.csv
file format for ease of analysis.
Setting measure setup
Procedure
1.
Press the MEASURE SETUP hot key.
2.
Press the Settings soft key and then set the following;
a. Press the Bandwidth soft key and then select the nominal channel bandwidth to be
measured from the choices: 1.4 MHz , 3 MHz , 5 MHz , 10 MHz , 15 MHz , and 20 MHz :
b. Press the MIMO soft key, and then select the antenna number option: 2x2 or 4x4 .
This MIMO (Multiple Input Multiple Output) setting is activated only if the option 031 LTE-
Advanced TDD is installed with a license number. If not, the instrument sets this option to
2x2 by default. A 2x1 or 4x1 RF combiner is also required to able to test on MIMO
channels.
c. Toggle the Cell ID soft key and select Auto or Manual as desired:
–
Auto : to let the instrument detect the Cell ID for the LTE signal automatically.
–
Manual : to set a specific Cell ID for the LTE signal manually in order to speed up the
synchronization with a BTS.
d. Press the Antenna Port soft key, and then select the option: Auto , 0 , 1 , 2 , or 3 .
If the option 031 LTE-Advanced TDD is not installed or if the MIMO is set to 2x2, the
antenna ports 2 and 3 are disabled.
e. Toggle the External Offset soft key and select On to set the external offset value.
f. To turn the Multimedia Broadcast Multicast Service (MBMS) feature on or off, toggle the
MBMS soft key and select On or Off .
g. To set the Multicast Broadcast Single Frequency Network (MBSFN) detection automatically
or manually for MBMS testing, toggle the
MBSFN soft key and select Auto or Manual . An
automatically detected or manually entered MBSFN ID appears on the screen.
3.
To save your settings, go to SAVE/LOAD > Save > Save Setup and then perform functions as
you desire. See
“Using save” on page 31 for more information.
4.
Press the Continue soft key to do the reference test first or press the Skip Reference Test soft
key if you already saved test results from the radio band under test.
5.
Press the FREQ/DIST hard key and then set the frequency to be measured. See
“Setting
frequency
” on page 266 for more information.
6.
Press the PREV hard key.
7.
Press the Limit soft key and then set the limits and allowed percentage change for each test
item. See
“Maintenance test” on page 303 for more information on setting limits.
8.
Keep pressing the PREV hard key until you see the Run Test soft key.
9.
Press the Run Test soft key.
The instrument runs specified tests to gather reference measurement values. The measurement
table appears when the reference test is done.
10.
Press the Continue soft key to run the testing on an antenna (Ant 1).