2201R Mobile Tester User Guide
Chapter 3 Performing manual tests and measurements in GSM mode
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Phase RMS
The RMS phase error is calculated from the phase errors of all bits within a burst, by root-mean-square-averaging
them. This value is always positive.
According to the specifications, the RMS phase error within a GSM burst must not exceed 5°.
PTT
This result field provides an overall evaluation of the burst profile against the power-time template. The limits are
according to the specifications, taking into account the individual power level and frequency band, and cannot be
altered. The result is either PASS or FAIL.
Burst length
This result field shows the length of the burst (between the –26 dB points).
If a burst is too short, not all data transmitted by the mobile can be received.
If it is too long, interference is caused in the subsequent time slot.
A normal GSM burst contains 148 bits, with a bit period of 48/13 μs. Consequently, a normal burst is about 546.5 μs
long (minimum) and has to fit into a time slot with a duration of 577 μs (maximum).
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