Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
51(78)
EGSM 900
Parameter
Power
level
Min
value
Max
value
Absolute
value Unit
Power at – 28 us 5 – 19 - -59 -36 dBc/dBm
Power at – 18 us 5 – 19 - -30 -17 dBc
Power at – 10 us 5 – 19 - -6 - dBc
Power at – 10 us 16 - -4 - dBc
Power at – 10 us 17 - -2 - dBc
Power at – 10 us 18 – 19 - -1 - dBc
Powerat–0us 5–19 -1 +1 - dBc
Power at – 542.8 us 5 – 19 -1 +1 - dBc
Power at – 552.8 us 5 – 19 - -6 - dBc
Power at – 560.8 us 5 – 19 - -30 - dBc
Power at – 570.8 us 5 – 19 - -59 -54 dBc/dBm
Table 14.1
GSM 1800
Parameter
Power
level
Min
value
Max
value
Absolute
value Unit
Power at – 28 us 0 – 15 - -48 -48 dBc/dBm
Power at – 18 us 0 – 15 - -30 -20 dBc
Power at – 10 us 0 – 15 - -6 - dBc
Power at – 10 us 11 - -4 - dBc
Power at – 10 us 12 - -2 - dBc
Power at – 10 us 13 – 15 - -1 - dBc
Powerat–0us 0–15 -1 +1 - dBc
Power at – 542.8 us 0 – 15 -1 +1 - dBc
Power at – 552.8 us 0 – 15 - -6 - dBc
Power at – 560.8 us 0 – 15 - -30 - dBc
Power at – 570.8 us 0 – 15 - -48 -48 dBc/dBm
Table 14.2
14.2 How to find the fault
Usually the fault is due to an incorrect power calibration.
The intermediate power level (see chapter 15 for further information) is also measured at the
power calibration, it has a direct effect on the raise and fall slope of the burst.
If the fault is electrical it is usually due to N700 or N400, but it can also be due to C498 or
C499.
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