Fluke 990DSL, Руководство пользователя, Страница: 175 / 242

XDSL Testing and Loop Qualification
ADSL Verify Test
5
5-37
Setting Up a Send WB Tone Test
To set up the Send WB Tone test, follow the instructions under “Displaying a
Setup Menu” in Chapter 3. Refer to Table 5-7 for setup parameters.
Table 5-7. Send WB Tone Test Setup Parameter
Parameter Setting (default in bold)
Transmit Impedance 100
e
or 135
e
Running a Send WB Tone Test
To Send a WB or BB Tone, do the following:
1. From the XDSL toolbox, select
Send WB Tone
and press
L
.
The
Send WB Tone
screen is displayed.
2. Press
A
(
Enter Send Frequency
). Enter the desired frequency (between
10 kHz and 17.66 MHz) and then press
L
. For tones above 1.2 MHz,
the 100 Ohm Transmit Impedance is automatically used.
3. Press
K
.
The tester begins sending the specified tone.
4. To stop sending the tone, press
M
or
K
.
ADSL Verify Test
The ADSL Verify Test is a rapid single-ended test of an active ADSL line to
determine the presence of both the C.O. DSLAM and customer modem, and to
determine the approximate bit-rate capability of the line. It is comprised of a
test looking toward the C.O. DSLAM (
ATU-C Test
) with the customer modem
disconnected, and a test looking toward the customer modem (
ATU-R Test
)
with the DSLAM disconnected.