Configure The Receiver Equalization Setting; Inject Errors - Quantifi Photonics BERT 1005 Series User Manual

8.3.5

Configure the receiver equalization setting

The input stage for each error detector channel includes a continuous-time linear equalizer (CTLE)
providing channel independent adjustable gain control. The ratio of the gain at 14 GHz to the low-
frequency gain of the equalization can be adjusted by changing the equalizer (EQ) boost value for a
channel. The adjustment range is between 0 dB and 21 dB, where the default setting for the EQ boost is
0 dB for each channel.
There are two modes for the EQ boost: Automatic and Manual. With the automatic mode, the system
automatically determines the optimal value of the EQ boost. The manual mode enables the flexibility to
specify the EQ boost value.
The response curve of the equalizer for the varying EQ boost values is shown below.
To specify the receiver equalization setting, take the following steps:
1. Click the EQ MODE drop-down list and select MANUAL or AUTO mode.
2. If MANUAL mode was selected, type a value within the valid rage in the EQ BOOST field.
The parameter can also be set to the MIN and MAX value by clicking the dropdown in the EQ
BOOST field.
8.3.6

Inject errors

A burst of errors can be injected on each channel to test the functionality of the error detector circuitry.
To inject errors, click the INJECT ERROR button. Each time the button is clicked, the pattern being
generated by the pattern generator inverts its polarity temporarily to force errors in the error detector.
INJECT ERROR functionality is disabled when running in ED point mode.
Quantifi Photonics Ltd. Version 2.04
Bit Error Rate Tester | BERT 1005
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