User guide

Click Enable button. It enables N4876A 28 Gb/s Multiplexer 2:1 that is

connected between data out of Serial BERT and the DUT.

Once the output levels of Data Out that you set on the PG Output screen will

control the output levels of the N4876A's Data Output. The level setting of Aux

Data will be disabled on the PG Output screen when the multiplexer function

is enabled.

Again, from the Config window, corrosponding to N4876A, clear the

Multiplexer function check box. It will disable the multiplexer function, and the

PG Output screen will allow to control the output levels of Data and Aux Data

at the connectors of the PG again.

If you could proceed until here, the connection of the user software to the N4876A

is OK.

Settings for Multiplexer Tests

The following are the settings to test the output of the N4876A 28 Gb/s Multiplexer:

• Preset Instrument State

• Set the PRBS 2^7-1

• Set the Data Rate to 3GB/s

• Set the Data Offset to 0V

• Set Data Amplitude to 400mV

• Enable Multiplexer in the Config window

Check the Output of the N4876A Multiplexer Using a Scope

Connect the Scope to Data Out of N4876A

Connect the Trigger-In of Scope to Trigger-Out of PG

Terminate N4876A Data /Out with 50 Ohm

Terminate PG Trigger-/Out with 50 Ohm

Terminate PG Data /Out and Aux /Data Out with 50 Ohm

9 Solving Problems

514 Agilent J-BERT N4903B High-Performance Serial BERT