2201R Mobile Tester User Guide
Chapter 3 Performing manual tests and measurements in GSM mode
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Class Ia, Ib, II
The BER Speech section displays the results for the class Ia, class Ib and class II bits.
The limits can be defined in the GSM/GPRS Limits menu. Typical limits can be found in Table 12.
Round Trip Delay
This is the number of frames that the mobile phone takes to return a speech frame.
This value is for information purposes only. It is not a required test with any test limits.
Interpreting RBER measurement results
The residual bit error ratio (RBER) is similar to the BER, except that all frames that the mobile detects an error in, are
rejected and not used for the RBER. Thus, only those frames are included in the RBER measurement that were
accepted by the mobile. The RBER is calculated for bit classes Ib and II only.
Table 12 BER limits on a GSM voice channel
Receive level >
–80 dBm
Receive level < –80
dBm
Class 1a bits 0 0
Class Ib bits 0.01% 0.41%
Class II bits 0.1% 2.0%
Note
The round trip delay may differ between the types of statistical measurements, but should be stable
within one measurement type.
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