C.8 Out‑of‑band signals

03.503GPPTransmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) systemTS

C.8.1 Discrimination against out‑of‑band input signal for handset and headset MS

The handset is mounted at LRGP and the earpiece is sealed to the knife‑edge of the artificial ear.

For input signals at frequencies of 4,65 kHz, 5 kHz, 6 kHz, 6,5 kHz, 7 kHz and 7,5 kHz at the level specified in clause 3.11.1, the level of any image frequencies at the digital interface shall be measured.

C.8.2 Spurious out‑of‑band signals for handset and headset MS

The handset is mounted at LRGP and the earpiece is sealed to the knife‑edge of the artificial ear.

For input signals at the frequencies 500, 1 000, 2 000, and 3 150 Hz applied at the level specified in clause 3.11.2, the level of spurious out‑of‑band image signals at frequencies of up to 8 kHz shall be measured selectively at the ERP.

C.8.3 Discrimination against out‑of‑band signals for handsfree MS

The MS is mounted as described in clauses B.4.2.1 or B.4.2.2, annex B. Uplink DTX is deactivated.

A white Gaussian noise signal, bandlimited to 4,6 kHz to 8 kHz is applied at the MRP at a level of –4,7 dBPa. The RF output of the MS is first channel and then speech decoded. The total level of the image in the frequency range 300 Hz to 3,4 kHz in this decoded signal shall be below a reference level by the amount specified in clause 3.11.1.2.

C.8.4 Spurious out‑of‑band emissions for handsfree MS

The MS is mounted as described in clauses B.4.2.1 or B.4.2.2, annex B. Any user controlled receiving volume control is set to maximum. An ITU‑T P.50 artificial speech signal in the frequency range 300 Hz to 3,4 kHz and at a level of –12 dBm0 is first speech and then channel encoded and is sent to the MS under test via the air interface. The total level of the spurious out‑of‑band image signals in the frequency range of 4,6 kHz to 8 kHz is measured in the measuring microphone or as combined at the output of the HATS. The level shall be lower than the in‑band acoustic reference level by the amount specified in clause 3.11.2.2.

To obtain the in‑band acoustic reference level an ITU‑T P.50 artificial speech signal in the frequency range of 300 Hz to 3,4 kHz at a level of –12 dBm0 is first speech and then channel encoded and sent to the MS under test via the air interface. The level of the signal in the frequency range of 300 Hz to 3,4 kHz measured in the measuring microphone or as combined at the output of the HATS is the in‑band acoustic reference level.