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order to perform the Transmit tests.
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When testing the data channels, it is necessary that the data formats for both the
modules be set the same (RS-232, RS-422, RS-485)
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The Transmit Test switch (SW7) on the module initiating the test must be in the ON
(down) position
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Test switches (SW5-10) on the local unit must be in the OFF (up) position
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This test overrides any external data that may be at the input terminals of the unit
under test.
This test will inject the Data and Contact Closure test signals into the transmitter and will
be sent over fiber to the associated receiver module. This test will perform diagnostic
tests on all of the channels integrated in the module using the module’s own internal test
signals. In addition, the internal frequency/data rate of the various internal tests is as
follows:
Data
- 1Hz square wave
Contact closure - 1Hz square wave
Once the Transmit test switch on the remote FT or FR module is switched ON, the above
signals will be transmitted over fiber to the receiving unit. The outputs can be
monitored by standard Data and Contact mapping measurement/monitoring techniques.
LED indicator status – During the test, the Tx channel indicator lights for the data and
contact mapping (TD & TC) on the module initiating the test will flash at a 1Hz rate. This
applies to each type and number of channels in the module. Likewise, 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.
To disable the test, move SW7 on the FT or FR switch to the OFF position.
Data/Contact Receive Test (SW8)
- (applicable to both full-duplex transceiver modules
and one-way receiver modules) These tests will test all of the data and contact closure
transmission channels installed on the module associated with the remote loopback test.
Obviously, the channels that can be tested are determined by the type of channels
associated with the particular module under test.
In order to perform the receive tests, it is necessary to configure both the modules as
follows:
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The FR and FT modules do not need to be connected together via fiber.
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The type of data output will be as per the data format selection switches 1 through
2 (RS-232, RS-422, RS-485)
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The Receive Test switch (SW8) on the module initiating the test must be in the ON
(down) position
