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AuroraPresto—User Guide
Section
Physical Layer Tests
3
3
The 'physical layer' (Layer 1 of the OSI-7 layer model), is
responsible for the electrical, mechanical and interface
aspects of transmitted data.
Noise Analysis
This performs a signal test to measure the amount of noise
across the available bandwidth.
When you select the ATU-C modem card option, the noise
analysis test measures the frequencies <130kHz. The noise
analysis graph displays the tones 1 to 29.
When you select the ATU-R modem card option, the noise
analysis test measures the frequency range 160 kHz to
1.1 MHz. The noise analysis graph displays the tones 38 to
255.
Notes
• The full ADSL bandwidth can only be tested if both
modem cards are present in the unit.
• The Noise Analysis option is not available if you have
selected the TI ATU-R(I) as the Modem Type.
Setting up the Noise Analysis Test
-1- From the Main Setup screen select Modem, and
-2- Select Type and choose AL ATU-C(P) for frequencies
-3- Press ENTER to exit the Type screen.
4-18
press ENTER.
The Type screen is displayed.
<130kHz
OR
Select Type and choose AL ATU-R(P) for frequencies
>160kHz.
481801
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