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Chapter 5 BERT Function
The analyzer has the function to send a test pattern and the function to compare the received data with the test pat-
tern. By a loopback test or a face-to-face test, the quality of the data communication line including the modem etc.
can be evaluated and the failure point of the data communication line can be isolated.
5.1 Connection and Settings
Select the measurement port according to the interface to be tested, and connect as follows according to the test
method.
2.3 Measurement Port
Loopback test
The test pattern data sent from this unit is looped back and tested at each point on the communication line. You
can evaluate the round-trip communication line that goes through each loopback point and can isolate the failure
point by changing the loopback point
Setting and switching of the loopback point in the device under test such as a model may be possible using the self-test
function of the device under test. If you cannot loop back inside the device, loop back at the connector.
End-to-End Test
The end-to-end test is a test in which a device with the BERT function as this unit has is connected to the other
party and the same test pattern is sent and received each other. This test allows you to evaluate the transmit line
and receive line separately.
