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16 Phase and Frequency Error
16.1 What is "Phase and frequency error"
Phase and frequency error is a measurement in the Go/No Go – test where you check how big
the phase and frequency variations of the transmitter are during a connected call.
The phase and frequency fault is measured during 20 bursts.
For GSM 900:
Use power level 5 and low channel (anyone between 1 and 5).
For GSM 1800:
Use power level 0 and low channel (anyone between 512 and 521).
The phase fault is presented as RMS and peak.
RMS is the average value during the 20 bursts and peak is the largest phase divergence
measured at anyone of the 20 bursts.
The tables below show the limits for phase and frequency fault Table.16.1 and Table.16.2.
Parameter
Max RMS
phase error
Max peak
phase error
Max frequency
error
Parameter
Max RMS
phase error
Max peak
phase error
Max frequency
error
4/00021-3/FEA 209 544/18 B
GSM 900
Value
5
20
90
Table.16.1
GSM 1800
Value
5
20
170
Table.16.2
Trouble Shooting Guide, Advanced
Unit
deg
deg
Hz
Unit
deg
deg
Hz
72(121)
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