Real Mobile Overall Test - Rohde & Schwarz CRTU-RU Service Manual

Radio Unit R&S
CRTU-RU
an error is detected, the two channels are cross-linked and the test is automatically repeated to locate
the error.
Note: Two additional tests BERTST and XTST are intended to provide a more detailed picture of
the RF signal path. These tests show the current Bit Error Test results as long as the test is
not terminated. The test BERTST tests an individual RF channel, which is selected as a
test parameter. The test XTST is a cross-link test. It combines the transmitter of channel 1
with the receiver of channel 2 or vice versa, depending on the test settings.

Real Mobile Overall Test

Please connect the Test Mobile to RF2 connector at the front panel.
Start Configuration Manager tool and make sure that the two items "Select Connectors Manually"
and "Select Power Levels Manually" are not activated. The operation mode must be set to "Stand
Alone".
Select the GSM mode in CRTx command shell (call: gsm), start Sequencer tool (call: seq) and
select the CRTUSENV test environment.
Make sure that the Test SIM configuration within SetCfg tool is set so that it matches the Test SIM
you are using (by default CRT-Z2 Phase 2+ SIM card).
MTC Audio Path Test
Run AUD_CALL with parameter FR (Full Rate Traffic Channel).
This is a Mobile Terminated Call (MTC), where the CRTU-RU sets up a traffic channel. Also the audio
path is activated.
Short-circuit the BNC connectors AUX1 and AUX2 with a BNC cable. When the traffic channel is
established, the Mobile's microphone picks up, the audio signal is looped back and will be output to the
Mobile's speaker with a delay of about a second. If this can be heard, the complete audio path works
properly.
BER Test Channel 1
Run BER_TEST with parameter CngChn.
For this test the CRTU-RU sets up a traffic channel on RF channel 1 and performs a Bit Error Rate test.
There shall be no incorrect frames but it is ok if there are some bit errors. This is because of the low RF
level provided to the mobile.
BER Test Channel 2
Run BER_TEST with parameter none.
For this test the CRTU-RU sets up a traffic channel on RF channel 2 and performs a Bit Error Rate test.
There shall be no incorrect frames but it is ok if there are some bit errors. This is because of the low RF
level provided to the mobile.
1140.0050.82 1.21
Manual Test Procedure
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