Manual Test Procedure CMU
1100.4903.82 1.16 E–4
Options for CMU200
The following tests can be carried out only if the GSM-MS (CMU-K2x) software options are installed and
enabled by entering a key code.
TX GSM Modulation
Only with options CMU-K21, CMU-K22, CMU-K23 or CMU-K24:
The GSM phase/frequency error of a TX path is measured.
Preparation: Test setup TX5:
½ Connect spectrum analyzer FSIQ to RF3 OUT.
Control: ½ Set CMU generator to specified RF frequency.
Output level at RF3 OUT 10 dBm
Training Sequence -> GSM0;
Bit Mod. -> PRBS
Transmission -> BURST
Settings at spectrum analyzer FSIQ:
Mode -> Digital Standards -> GSM
Mode -> Meas Result -> Result_Length -> 146 (the useful part normally comprises
147 bits, however, the FSIQ can be set to an integer number of bits only and
therefore cuts off 0.5 bits at the beginning and at the end of the measurement
range)
Trigger -> Find Sync -> ON
Trigger -> Sync Pattern -> gsm_bts0 (training sequence GSM0)
Trigger -> Sync Offset -> 60 symbols
Test: Phase (rms and peak) and frequency errors are measured according to GSM
recommendation.
RX GSM Demodulation
Only with option CMU-K21, CMU-K22, CMU-K23 or CMU-K24:
The GSM phase/frequency error of a RX path is measured.
Preparation: ½ Connect GSM signal generator to RF2 (test setup RX3).
The signal generator must be synchronized with the CMU via the 10 MHz
reference frequency.
Control: Signal generator SMIQ: GSM signal at given frequency, level according to table,
bursted with the following settings:
Digital Std -> GSM/EDGE -> State -> ON;
Digital Std -> GSM/EDGE -> Select Slot -> Burst type -> NORM
Digital Std -> GSM/EDGE -> Select Slot -> Slot Level -> FULL
Digital Std -> GSM/EDGE -> Select Slot -> Data -> PN9
Digital Std -> GSM/EDGE -> Select Slot -> TSC -> TSC0
CMU: GSM Non Signalling, training sequence = GSM 0, trigger source = IF
Power, Trigger Level = Medium
Test:
½ Measure GSM phase error (rms and peak) as well as frequency error.
To Next Page
Loading...
Need help?
General
