Fluke 990DSL, Руководство пользователя, Страница: 127 / 242

POTS Testing and Fault Location
Dial-Up Test Group
4
4-63
DATU Tests
The DATU (Direct Access Test Unit) tests enable the CopperPro tester to dial
a C.O.-based Fluke Networks DATU over a working POTS line. The DATU
can then be instructed to access the line-under-test (through the switch Test
Trunk), split off the battery feed circuit, and apply selectable terminations for
an entered time period.
To run a DATU test, do the following:
1. From the Dial-Up Test Toolbox, select
DATU Tests
and press
L
.
The
DATU
test selection screen is displayed.
2. Do one of the following:
•
Press
A
(
Automatic Open
), then, follow the on-screen prompts and
instructions.
This test allows the DATU Auto-Open or “dry line” number
(typically a unique number that is separate and distinct from the
normal DATU access number) to be dialed from the test line. After
the number is dialed, the battery feed circuit is split from the line for
one to two minutes (with no termination applied).
Note
To verify access and splitting, run the Continuous DCV test until
you see that the T-R battery voltage has been removed. Next, run
a POTS Auto-Test on the test line to quickly give you the most
information before battery voltage is restored, following the
timeout.
OR
•
Press
B
(
Manual Termination
), then, follow the on-screen prompts
and instructions.
This test allows the DATU’s normal access number to be dialed, after
which you can instruct it to apply a specific metallic termination to
the test line for the entered time period.