2201R Mobile Tester User Guide
Chapter 3 Performing manual tests and measurements in GSM mode
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Setting up the test parameters
Cobham proposes to leave the test parameters at their default values if you are unsure about their meaning.
Measurement Mode
The Mode selection field allows you to choose between the different measurement methods. Available entries are
BER, FER and FBER. The default is BER.
Bit Pattern
This selection field lets you choose the bit pattern that is sent to the mobile phone. Available patterns are:
0000... (all zeros)
1111... (all ones)
1010... (bit reversals starting with 1)
0101... (bit reversals starting with 0)
PRBS-9 (PN-9 pseudo-random bit sequence), this is the default
PRBS-15 (PN-15 pseudo-random bit sequence)
PRBS-23 (PN-23 pseudo-random bit sequence)
Samples
This entry field allows you to select the number of samples (normally bits) that make up a measurement. Allowable
entries are in the range from 2,000 to 10,000. The default value is 10,000.
Interpreting BER measurement results
The bit error rate (BER) is tested for all the different classes of speech and data bits; these are class Ia, class Ib and
class II bits. Class Ia bits are best protected against corruption on the air interface whereas class II bits are completely
unprotected.
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