Siemens C35 series Service Manual page 46

The GSM test set will make Tx Power measurements, Rx BER measurement, Echo Loop test
on the GSM and GSM1800 channel specified by the configuration setting. There will be 2 Echo
Loop Back test for checking the speech quality – one for GSM and one for GSM1800. Speak
into the mobile phone when prompted and listen the voice after appr. 1 second and check the
speech quality. If not O.K, it may be microphone or the earphone defective.
The last test is Disconnect Call from the mobile phone. Press the End Call key and the test
sequence will end.
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