
194 Chapter 6
BERT Testing
Bit Error Rate Tester–Option UN7
Testing Signal Definitions
The timing diagram Figure 6-30, “Testing Signal Definitions,” shows the relationships
between a trigger event and the output signals at the BER MEAS END and BER TEST OUT
connectors.
If a BER MEAS END signal stays high following a trigger event, the BER measurement is in
progress and other trigger events are ignored. This state is stored in the status register and
can be queried.
Figure 6-30 Testing Signal Definitions
• T1 is a firmware handling time measured from a Trigger event to the rising edge of a BER
MEAS END signal.
• T2 is a firmware handling time measured from the falling edge of a BER TEST OUT signal
to the falling edge of the BER MEAS END signal.
• T3 is a minimum requirement time measured from the falling edge of the BER MEAS
END signal to the next trigger event. T3 should be greater than 0 second.
The pulse output of the BER TEST OUT for the Nth-1 test result ends prior to the falling edge
of the BER MEAS END signal for the Nth measurement; so you can use this edge to start
latching the Nth test result.
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