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The receive test will perform diagnostic tests on all of the channels integrated in the
module using the module’s own internal test signals. The internal frequency/data rate of
the various internal tests is as follows:
Data
- 1Hz square wave
Contact closure - 1Hz square wave
Once the Receive test switch on the FT or FR module is switched ON, the above signals
sent to the appropriate electrical outputs on the same module. These signal outputs can
be monitored by standard Data and Contact mapping measurement/monitoring
techniques.
LED indicator status – During the test, each of the channel’s front panel Rx channel
indicator lights for the data and contact mapping (RD & TC) on the receiver module’s front
panel will flash at a 1Hz rate to indicate proper reception of the test signals. This applies to
each type and number of channels in the module.
To disable the test, move SW7 on the FR or FT switch to the OFF position. This will
restore operation to its normal mode.
Video Test
– (Applicable to one-way transmission modules (FT & FR units). This video
test mode will allow the user to test the video transmission channel without the use of an
external camera to generate a video signal.
There are two video tests available – Transmit video & Receive video. The following
describes the test setup for each:
Transmit video test – This test injects a 4-bar video test pattern into the video transmitter
and sends this signal over fiber to the associated receiver module.
In order to initiate the internal transmit video test it is necessary to configure the modules
as follows:
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SW7 on the FT video Tx module must be set to the ON (down) position.
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SW8 on the FR video Rx module must be set to the OFF (up) position.
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The optical fiber between the FT & FR modules must be connected together
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Connect a standard video monitor to the output of the FR (Video Receiver) module
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4 grey-scale vertical bars will be displayed on the monitor
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Receiver module LEDs – If a video monitor is not available, the activity of the
transmit video test can be monitored on the receiver’s front panel LEDs. When
this test is activated, the receiver modules Video Sync & Video Present green
LEDs (SYN & VIDEO) will light.
Receive video test – This test injects an 8-bar video test pattern into the video receiver
and sends it to the receiver output BNC for display on a video monitor.
