Specifications

Chapter 4 80
Tests
TEST_05 TX In-Channel Tests
TEST_05 TX In-Channel Tests
Description This test performs the following in-channel tests on the transmitter
portion of the mobile station:
• TX phase error (rms and peak)
• TX frequency error
• TX power error (measured at the default power control level)
• TX timing error
• TX amplitude negative and positive peak flatness
• TX amplitude envelope at
±28µs
1
, ±18µs, and ±10µs
• SACCH TX level and timing advance
• SACCH RX quality and level error
The frequency error must be < 0.1 ppm and the phase error must be
<5
°rms, and < 20° peak for the mobile station to pass.
The amplitude envelope flatness measurement is made over the 147
useful bits of the GSM burst, and must be within ±1.0 dB for the mobile
station to pass.
The amplitude envelope rising and falling edge measurements are
made at the following points, with the negative values relative to bit 0
(rising edge) and the positive values relative to bit 147 (falling edge):
•
±28µs
1
point: Limit = −70 dBc
•
±18µs point: Limit = − 30 dBc
•
±10µs point: Limit = − 6 dBc
The RX quality level must be zero for the mobile station to pass.
However, at the RF signalling levels of less than −98 dBm the mobile
station will not fail the RX quality test (the RF signalling level is set by
parameter 20).
All pass/fail limits are set to verify transmitter compliance with GSM
11.10 recommendations, GSM 11.10 DCS recommendations, and the
document – PN 3389 Personal Communications Services Air Interface
Specification.