Agilent Technologies AuroraPresto, Руководство пользователя

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Aurora Presto
—User Guide
4-18 481801
3
Physical Layer Tests
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
press ENTER .
The
Type
screen is displayed.
-2-
Select
Type
and choose
AL ATU-C(P)
for frequencies
<130kHz
OR
Select
Type
and choose
AL ATU-R(P)
for frequencies
>160kHz.
-3-
Press ENTER to exit the
Type
screen.
3
Section
481801-7.book Page 18 Thursday, May 23, 2002 10:46 AM