Testing
Introduction
PT/PR-150C Module Installation & Operation Manual
Harris Corporation
Issue 1, October 2000
Intraplex Products
4-2
4.1
Introduction
When the PT-150C transmitter module and the PR-150C receiver module have
been configured and installed, test them for proper operation before putting them
into service.
There are two ways you can do the testing:
•
If you have both a PT-150C and a PR-150C in the same shelf, you can
perform this test with the system out of service, by looping back the
multiplexer’s high-speed output port (T1, E1, or variable rate).
•
If the PT-150C and PR-150C are in different locations, perform the test
end-to-end with the system in service and the channel out of service.
4.2
Test Procedure
Use the following procedure to test the modules:
1.
If you are looping back the mutliplexer’s signal, set up the loopback following
the instructions in the multiplexer operation manual.
2.
On the PT-150C, connect the output of an external audio test tone generator to
the audio in jack for the channel to be tested. If the generator is connected the
the module adapter, set SW1/positions 1 through 4 OFF to prevent the test
signal from back-driving the channel. Test one channel at a time. The input
jacks accept a three-conductor balanced input.
3.
Set the test tone generator to generate a 1004 Hz tone at +8.0 dBm.
4.
On the PT-150C, observe the level indicators for the channel under test.
Adjust the level control for this channel so that the first two green indicators
are on, and the third green indicator is just coming on.
5.
Check that the fail indicator on the PT-150C is not lit.
The PT-150C is now properly calibrated. Further adjustments should be made on
the PR-150C only.
For the following steps, check the output level and indicators on the PR-150C in
the local shelf if you are using loopback testing, or on the PR-150C at the receive
end if you are using end-to-end testing.
Connect an audio voltmeter to the audio output jack on the PR-150C card. If
necessary, adjust the left or right output level control on the PR-150C card to
obtain a reading of +8.0 dBm.
6.
Observe the level indicators for the channel under test. Check that the first
two green indicators are on, and that the third green indicator is just coming
on at +8.0 dBm.
7.
Check that the activity (DATA IN) indicators are on, and the overload and fail
indicators for this channel are not lit.
8.
Repeat Steps 2 through 7 on the other channel.
9.
Turn off the test generator and disconnect it from the PT-150C input jack.
